Operant Conditioning of a Spinal Reflex Can Improve Locomotion after Spinal Cord Injury in Humans

Aiko K. Thompson, Ferne Pomerantz, Jonathan R. Wolpaw · Journal of Neuroscience · 2013 · rehabilitation-neuroscience · 10.1523/jneurosci.3968-12.2013 · record thompson2013-operant-conditioning-of-a-spinal-r
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Where this record's text came from. faceted 2026-08 by reading the locally held text (html); every evidence string verified as an exact substring of that text before merging. Claim type is 'method' because the paper's stated contribution is a new therapeutic approach (reflex-conditioning protocols targeted to individual deficits) rather than the bare existence of the effect; the outcome data serve as the demonstration. Replication status is 'untested' for the human locomotor result itself even though the paper reports cross-species consistency with rat work — that consistency is captured in the 'replicates' relation instead. The randomised 2:1 group allocation and small n (13) are stated in Materials and Methods but the paper does not itself flag sample size as a limitation, so it is not listed. 2026-08-12, 2026-08-13 and 2026-08-15 schema-0.3 passes: every quote verified as an exact substring of the staged text and anchored at merge time; concept terms verified present; every edge endpoint an existing node.
How to read this page. The article itself is not reproduced here — this paper is not cleared for redistribution, so what follows is the tag layer alone. The evidence sentences are withheld with the article. The table at the foot lists every tag the record carries; each row names the facet it belongs to, and the whose words column says whether the tag records the paper's own wording or the tagger's sentence about the paper. Every tag links to each other paper in the corpus carrying it. The machine-readable edition of the same thing is the TEI file beside this one, where the tags live in standOff, and the article is at its publisher via the link below. When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.
Other fields define these differently the same word, defined another way in another discipline
MI 3 fields · standard deviation 3 fields

Tags on this paper

Every tag the record carries, each linking to every other paper in the corpus that carries it. A tag appears here whether or not its words occur in the article — the spans below are only the ones a sentence in this paper licenses. Of the 25 concept tags on this paper, none is grounded in a quoted sentence. All carry the tagger's gloss of what the term means in this paper, which is not something the article can license.
H-reflex soleus tibialis anterior operant conditioning down-conditioning up-conditioning task-dependent adaptation long-term change spinal cord plasticity negotiated equilibrium corticospinal tract spinal cord injury hyperreflexia spasticity modulation index step cycle step-cycle symmetry M-wave recruitment curve background EMG locomotion swing phase clonus Modified Ashworth scale American Spinal Injury Association Impairment Scale Acquiring the new smaller-reflex behaviour disturbs the post-injury spinal equilibrium and thereby triggers widespread adaptive plasticity that settles into a new equilibrium serving both the new reflex and locomotion In neurologically normal people, compensatory plasticity protecting already-satisfactory behaviours works against the long-term spinal change, which is why long-term change is smaller in them than in SCI subjects Injury to the corticospinal tract, the descending pathway that conditioning depends on, weakens the immediate cortical (task-dependent) component of the reflex change in SCI subjects Better bilateral modulation of ankle muscle activity yields more effective weight bearing and push-off, which in turn raises walking speed H-reflex size conditioned H-reflex size modulation index (MI) control H-reflex size successful down-conditioning soleus H-reflex size walking time MI 10 m walking speed soleus and TA background EMG level M-wave size t-test unpaired t test (two tailed) paired t test ANOVA repeated-measures ANOVA Mann-Whitney U test Mann–Whitney U test p-value standard deviation mean ± SD standard error mean ± SE unpaired t test two-tailed t test two-way repeated-measures ANOVA one-way repeated-measures ANOVA behavioural-experiment

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second readingalternativesan independent re-reading of a facet, recorded whether or not it agrees
relation to other workclaim_relationshow this paper stands to another: agrees, contradicts, extends, qualifies
claim typeclaim_typethe shape of the claim: existence, mechanism, method, critique, prediction, null
concept edgeconcept_edgesan asserted relation between two concepts, with the sentence asserting it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
controlcontrolsan experiment run to eliminate a rival explanation
limitationlimitationswhat the paper says its evidence cannot support
mechanismmechanismshow the reported effect is said to come about
methodmethodhow the paper produced its evidence
object of studyobject_of_studywhat the paper is about — the thing it investigates
phenomenonphenomenonthe effect or regularity under study
research questionresearch_questionthe question the paper sets itself
sensesensesa distinct use of a term, quoted where the paper fixes it

The paper

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Every tag on this page

alternatives 3 · claim_relations 7 · claim_type 1 · concept_edges 8 · content_tags 77 · controls 1 · limitations 9 · mechanisms 10 · method 1 · object_of_study 1 · phenomenon 1 · research_question 1 · senses 9

Relations on this page carry a quotation for the claim. Where a relation was separately evidenced — and so tested against the vocabulary for its type — the row says so; none of 8 relations here carry that mark. The rest are the tagger’s reading of the sentence quoted beside them.

facettagfieldconf.whose words
object_of_studyThe soleus H-reflex, and whether operantly down-conditioning it improves locomotion in people with chronic incomplete spinal cord injury.
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object_of_studythe paper's words
research_questionCan people with chronic incomplete spinal cord injury down-condition the soleus H-reflex operantly, and if so is the reflex decrease accompanied by improved locomotion?
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research_questionthe paper's words
claim_typemethod
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claim_typethe paper's words
phenomenonoperant down-conditioning of the soleus H-reflex
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phenomenonthe paper's words
methodbehavioural-experiment
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methodthe paper's words
mechanismsmechanisms
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mechanisms[0]the tagger's words
mechanismsmechanisms
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mechanisms[1]the tagger's words
mechanismsmechanisms
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status: the paper's own words: may reflect
mechanisms[2]the tagger's words
mechanismsmechanisms
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mechanisms[3]the tagger's words
mechanismsConditioned H-reflex change decomposes into a within-session task-dependent adaptation, read as cortical influence, plus an across-session long-term change, read as spinal cord plasticity
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mechanisms[4]the tagger's words
mechanismsThe two components split differently after injury: less task-dependent adaptation, more long-term change, summing to the same total decrease as in normal subjects
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mechanisms[5]the tagger's words
mechanismsReduced task-dependent adaptation after injury is attributed to damage to the corticospinal tract, on which reflex conditioning depends
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mechanisms[6]the tagger's words
mechanismsIn an uninjured cord, compensatory plasticity protects behaviours that are already satisfactory and thereby limits the long-term reflex change; after injury there is nothing to protect, so the change proceeds further
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mechanisms[7]the tagger's words
mechanismsAcquiring the new reflex disturbs the equilibrium the injured cord had settled into, triggering wider plasticity that changes locomotion as a whole rather than one pathway
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mechanisms[8]the tagger's words
mechanismsAfter injury the long-term change is doubly rewarded - it satisfies the conditioning criterion and it improves walking - which is offered as why it goes further than in normal subjects
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mechanisms[9]the tagger's words
limitationsThe success rate, though not significantly below that of normal subjects, was lower, and applicability to more severe impairment is unknown.
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what this limits: the transfer of the method to more impaired patients: THEIR SUCCESS RATE WAS NOT SIGNIFICANTLY DIFFERENT FROM THAT OF NORMAL SUBJECTS ... IT WAS LOWER
limitations[0]the tagger's words
limitationsThe small H-reflex increase seen in the unconditioned control group may be a nonspecific effect of repeated exposure to the measurement protocol.
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what this limits: the control-group baseline drift: THIS MAY HAVE BEEN A NONSPECIFIC EFFECT OF CONTINUED EXPOSURE OVER 30 SESSIONS TO THE BASELINE PROTOCOL
limitations[1]the tagger's words
limitationsThirteen subjects, of whom only six showed the effect, and the comparison group has four
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what this limits: every group-level statistic: 13 AMBULATORY SUBJECTS, of whom only six showed the effect, against a comparison group of four
limitations[2]the tagger's words
limitationsAll subjects were AIS grade C or D, so the protocol is untested in more severe injury and requires surviving supraspinal input
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what this limits: any extension to more severe injury: THE NEED FOR SUPRASPINAL INPUT WILL REMAIN, and all subjects here retained it
limitations[3]the tagger's words
limitationsThe subjects who improved are the same subjects in whom conditioning worked, so improvement and successful conditioning cannot be separated from subject-level differences
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what this limits: the walking-improvement result, which is not independent of the conditioning result: THE IMPROVEMENT ... DID NOT OCCUR IN PEOPLE IN WHOM THE H-REFLEX DID NOT DECREASE, WHETHER THEY WERE UC SUBJECTS OR UNSUCCESSFUL DC SUBJECTS
limitations[4]the tagger's words
limitationsThe breadth of the effect exceeds what the manipulated pathway can explain, and the wider plasticity invoked to cover the gap is inferred rather than measured
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what this limits: the proposed mechanism's sufficiency: IT IS UNLIKELY THAT THE PLASTICITY UNDERLYING A SMALLER SOLEUS H-REFLEX IN ONE LEG COULD ITSELF HAVE SUCH BROAD BENEFICIAL EFFECTS ON WALKING
limitations[5]the tagger's words
limitationsThe normal-subject comparison values are drawn from an earlier study rather than a concurrent control group
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what this limits: every comparison against normal values: THE DATA FOR NORMAL DC SUBJECTS ARE FROM THOMPSON ET AL. (2009), not from a concurrent control group
limitations[6]the tagger's words
limitationsThe subject comments are unsolicited and unblinded, and the subjects knew which protocol they were on
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what this limits: the subjects' own reports of benefit: OVER THE 3 MONTHS OF THE STUDY, THE SUBJECTS WERE NOT ASKED ABOUT THE CURRENT STATE OF THEIR MOTOR FUNCTION - unsolicited and unblinded
limitations[7]the tagger's words
limitationsThe comparison group's reflex drifted upward over the same period, which the authors attribute to nonspecific exposure rather than measure
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duplicate of: limitations[1] · what this limits: the same scope as limitations[1] - the control group's reflex drifted upward over the same period, attributed to nonspecific exposure to the baseline procedure rather than to conditioning
limitations[8]the tagger's words
controlscontrol trials in which the visual feedback shows only background EMG and nothing about H-reflex size - the weakest entry in this sample, carried by the word SIMPLY
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eliminates: prestimulus background EMG differing between control and conditioning trials, so a change in the reflex cannot be a posture or muscle-activation effect · outcome (stated by the tagger, no quotation): held
controls[0]0.7the tagger's words
sensesH-reflex - conditioned: the average over the 225 feedback trials, the reflex the subject was actively trying to change
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senses[0]1.0the tagger's words
sensesH-reflex - control: the average over 20 trials with no feedback and no instruction, which is what shows whether the change persists when the subject is not trying
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senses[1]1.0the tagger's words
sensesH-reflex - locomotor: the average across 12 step-cycle bins during walking, a different behavioural context from the standing measurement
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senses[2]1.0the tagger's words
sensesH-reflex - maximum (H max): the peak of the recruitment curve, a property of the pathway rather than of a trial
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senses[3]1.0the tagger's words
sensessuccess - within a trial: the reflex fell below the current criterion value, shown to the subject as a green bar
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senses[4]1.0the tagger's words
sensessuccess - across the study: the last six conditioning sessions differed significantly from baseline, which is the sense in which two-thirds of subjects succeeded
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senses[5]1.0the tagger's words
sensesmodulation - of EMG across the step cycle: how much a muscle varies its own activity, captured by the modulation index
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senses[6]1.0the tagger's words
sensesmodulation - of the reflex across the step cycle: how reflex size varies by phase, which should be lowest in swing and becomes so after conditioning
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senses[7]1.0the tagger's words
senseschange - task-dependent adaptation: the within-session difference between control and conditioned reflex, produced immediately on being asked
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senses[8]1.0the tagger's words
alternativesclaim_type: method
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a second reading reaching the same value. Recorded: method — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.claim_typethe tagger's words
alternativesmethod: behavioural-experiment
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a second reading reaching the same value. Recorded: behavioural-experiment — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.methodthe tagger's words
alternativesphenomenon: operant down-conditioning of the soleus H-reflex
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a second reading reaching the same value. Recorded: operant down-conditioning of the soleus H-reflex — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.phenomenonthe tagger's words
claim_relationsbuilds-on → Thompson et al. (2009) human soleus H-reflex conditioning protocol in neurologically normal subjects
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claim_relations[0]the tagger's words
claim_relationsextends → Chen et al. (2006b) soleus H-reflex conditioning in spinal cord-injured rats
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claim_relations[1]the tagger's words
claim_relationsreplicates → Chen et al. (2006b) and Segal and Wolf (1994)
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claim_relations[2]the tagger's words
claim_relationsextends → Thompson et al. 2009, the same conditioning protocol in neurologically normal subjects
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claim_relations[3]the tagger's words
claim_relationsextends → Chen et al. 2006b, H-reflex conditioning in spinal cord-injured rats
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claim_relations[4]the tagger's words
claim_relationssupports → Wolpaw 2010, the negotiated equilibrium hypothesis
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claim_relations[5]the tagger's words
claim_relationssupports → Segal and Wolf 1994, spinal stretch reflex conditioning in people with SCI
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claim_relations[6]the tagger's words
concept_edgestask-dependent adaptation —part-of→ H-reflex
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strength of the relation: 1
concept_edges[0]the tagger's words
concept_edgeslong-term change —part-of→ H-reflex
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strength of the relation: 1
concept_edges[1]the tagger's words
concept_edgestask-dependent adaptation —contrasted-with→ long-term change
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strength of the relation: 1
concept_edges[2]the tagger's words
concept_edgesstep-cycle symmetry —operationalised-as→ step cycle
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span defines symmetry as a RATIO of intervals within the step cycle; operationalised-as is loose.
concept_edges[5]the tagger's words
concept_edgesspasticity —causes→ swing phase
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strength of the relation: 0.9 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span says spasticity PROLONGED the swing phase; the direction is not on the edge.
concept_edges[6]the tagger's words
concept_edgeshyperreflexia —causes→ locomotion
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strength of the relation: 0.9 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span says locomotion was impaired by hyperreflexia; the edge carries no direction.
concept_edges[7]the tagger's words
concept_edgescorticospinal tract —causes→ task-dependent adaptation
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strength of the relation: 0.6 — the record marks this weak Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span says the lesser adaptation MAY reflect damage to the CST; hedged.
concept_edges[9]the tagger's words
concept_edgessoleus —contrasted-with→ tibialis anterior
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but soleus and its antagonist were both recorded; contrasted-with is loose.
concept_edges[11]the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[0]the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[1]the tagger's words
content_tagsANOVA
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also in: ANOVA
content_tags.statistics[2]the tagger's words
content_tagsMann-Whitney U test
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content_tags.statistics[3]the tagger's words
content_tagsp-value
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also in: p-value
content_tags.statistics[4]the tagger's words
content_tagsstandard deviation
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content_tags.statistics[5]the tagger's words
content_tagsstandard error
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content_tags.statistics[6]the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[7]the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[8]the tagger's words
content_tagsMann-Whitney U test
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content_tags.statistics[9]the tagger's words
content_tagsrepeated-measures ANOVA
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content_tags.statistics[10]the tagger's words
content_tagsrepeated-measures ANOVA
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content_tags.statistics[11]the tagger's words
content_tagsstandard error
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content_tags.statistics[12]the tagger's words
content_tagsstandard deviation
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content_tags.statistics[13]the tagger's words
content_tagsp-value
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also in: p-value
content_tags.statistics[14]the tagger's words
content_tagsp-value
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also in: p-value
content_tags.statistics[15]the tagger's words
content_tagsSix of the nine people with spinal cord injury successfully down-conditioned the soleus H-reflex, a 67% success rate not significantly below the 89% seen in neurologically normal subjects.
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content_tags.findings[0]the tagger's words
content_tagsThe H-reflex decrease was specific to the conditioning protocol: no unconditioned subject's reflex fell, and the two groups' final reflex sizes differed significantly.
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content_tags.findings[1]the tagger's words
content_tagsTen-metre walking speed rose by an average of 59% in the six subjects whose H-reflex decreased.
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content_tags.findings[2]the tagger's words
content_tagsGait symmetry moved toward the ideal ratio of 1 in every subject whose H-reflex decreased.
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content_tags.findings[3]the tagger's words
content_tagsIn subjects whose H-reflex did not decrease, gait actually became less symmetrical over the same 30 sessions.
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content_tags.findings[4]the tagger's words
content_tagsSuccessful down-conditioning of one leg's soleus reflex increased step-cycle EMG modulation in ankle and knee flexors and extensors of both legs, not just the conditioned leg.
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content_tags.findings[5]the tagger's words
content_tagsAlthough the total reflex decrease matched that of normal subjects, its composition differed: SCI subjects showed less immediate task-dependent adaptation (-7% vs -15%) and more long-term across-session change (-24% vs -16%).
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content_tags.findings[6]the tagger's words
content_tagsUnprompted positive reports of improved walking clustered almost entirely in the six successfully conditioned subjects (25 of 30 comments).
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content_tags.findings[7]the tagger's words
content_tagsThe reflex decrease persisted after training stopped, averaging 65% of baseline at one month and 58% at three months.
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content_tags.findings[8]the tagger's words
content_tagsThe reflex reduction carried over into walking itself: the H-reflex elicited during locomotion fell to 59% of its baseline size.
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content_tags.findings[9]the tagger's words
content_tagsthe conditioned H-reflex fell to the same 69% of baseline in SCI subjects as in normal subjects, but by a different mix of components
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content_tags.findings[10]the tagger's words
content_tagstask-dependent adaptation was smaller and long-term change larger after injury
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content_tags.findings[11]the tagger's words
content_tagsreflex decrease was specific to the down-conditioning protocol and absent in the unconditioned group
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content_tags.findings[12]the tagger's words
content_tagsthe unconditioned group's reflex rose slightly but significantly over the same period
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content_tags.findings[13]the tagger's words
content_tagswalking speed rose 59% on average in the six subjects whose reflex decreased
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content_tags.findings[14]the tagger's words
content_tagsgait symmetry improved in every subject whose reflex decreased and worsened in every subject whose did not
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content_tags.findings[15]the tagger's words
content_tagsEMG modulation improved bilaterally, not only in the conditioned leg
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content_tags.findings[16]the tagger's words
content_tagsthe reflex decrease persisted at one and three months in every subject
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content_tags.findings[17]the tagger's words
content_tagsunsolicited positive comments appeared only after the conditioned reflex had decreased substantially, from the 12th session on
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content_tags.findings[18]the tagger's words
content_tagstwo subjects reduced their reliance on a walking aid
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content_tags.findings[19]the tagger's words
content_tagsthe success rate in SCI subjects was 67%, not significantly below the 89% seen in normal subjects
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content_tags.findings[20]the tagger's words
content_tagsstimulus and recording conditions were stable across all sessions, ruling out measurement drift as the source of the reflex change
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content_tags.findings[21]the tagger's words
content_tagsH-reflex size
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also in: H-reflex size
content_tags.definitions[0]the tagger's words
content_tagsconditioned H-reflex size
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content_tags.definitions[1]the tagger's words
content_tagsmodulation index (MI)
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content_tags.definitions[2]the tagger's words
content_tagsstep-cycle symmetry
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content_tags.definitions[3]the tagger's words
content_tagstask-dependent adaptation
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content_tags.definitions[4]the tagger's words
content_tagsnegotiated equilibrium
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content_tags.definitions[5]the tagger's words
content_tagscontrol H-reflex size
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content_tags.definitions[6]the tagger's words
content_tagsmodulation index
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content_tags.definitions[7]the tagger's words
content_tagsnegotiated equilibrium
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content_tags.definitions[8]the tagger's words
content_tagssuccessful down-conditioning
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content_tags.definitions[9]the tagger's words
content_tagssoleus H-reflex size
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content_tags.variables[1]the tagger's words
content_tagswalking time
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also in: walking time
content_tags.variables[2]the tagger's words
content_tagsstep-cycle symmetry
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content_tags.variables[3]the tagger's words
content_tagsMI
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also in: MI
content_tags.variables[4]the tagger's words
content_tagsconditioned H-reflex size
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content_tags.variables[7]the tagger's words
content_tagscontrol H-reflex size
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content_tags.variables[8]the tagger's words
content_tags10 m walking speed
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content_tags.variables[9]the tagger's words
content_tagsmodulation index
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content_tags.variables[10]the tagger's words
content_tagssoleus and TA background EMG level
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content_tags.variables[11]the tagger's words
content_tagsM-wave size
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also in: M-wave size
content_tags.variables[12]the tagger's words
content_tags6/9 or 67% — proportion of SCI subjects in whom down-conditioning succeeded
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content_tags.quantities[0]the tagger's words
content_tags69 ± 11% and 69 ± 6% — final conditioned H-reflex as a percentage of baseline in SCI subjects and in normal subjects — identical values
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content_tags.quantities[1]the tagger's words
content_tags+59 ± 19% — mean increase in 10 m walking speed among successfully conditioned subjects
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content_tags.quantities[2]the tagger's words
content_tags74 ±17% to 80 ± 11% — average locomotor EMG modulation index before and after successful down-conditioning
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content_tags.quantities[3]the tagger's words
content_tags20 control and 225 conditioned — number of H-reflexes elicited per conditioning session for the down-conditioning subjects
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content_tags.quantities[4]the tagger's words
content_tags−7% vs −15% — task-dependent adaptation in SCI subjects compared with neurologically normal subjects
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content_tags.quantities[5]the tagger's words
content_tags25 of the 30 — positive spontaneous comments contributed by the six successfully conditioned subjects
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content_tags.quantities[6]the tagger's words
content_tagsn = 13 — total number of ambulatory subjects with spinal cord injury enrolled
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content_tags.quantities[7]the tagger's words
content_tags13 subjects — the whole sample, split 9 conditioned and 4 unconditioned
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content_tags.quantities[8]the tagger's words
content_tags2:1 — the randomisation ratio favouring the conditioned group
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content_tags.quantities[9]the tagger's words
content_tags30 sessions — the length of the conditioning phase, six more than the 24 needed in normal subjects
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content_tags.quantities[10]the tagger's words
content_tags225 conditioned H-reflexes — trials per session carrying feedback, against 20 without
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content_tags.quantities[11]the tagger's words
content_tags50–60% — the success rate the criterion was tuned to produce, keeping the task neither trivial nor hopeless
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content_tags.quantities[12]the tagger's words
content_tags69 ± 11% — final conditioned H-reflex as a share of baseline in SCI subjects, identical to normals
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content_tags.quantities[13]the tagger's words
content_tags+59 ± 19% — walking speed gain in the subjects whose reflex decreased
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content_tags.quantities[14]the tagger's words
content_tags0–123% — the full spread of walking speed change across all subjects
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content_tags.quantities[15]the tagger's words
content_tags30 positive comments and no negative comments — the unsolicited subject reports, 25 of them from the six successful subjects
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content_tags.quantities[16]the tagger's words
content_tags0.59 to 0.80 m/s — one subject's walking speed before and after, given as the concrete case behind the group mean
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content_tags.quantities[17]the tagger's words
content_tags8 months to 50 years — time since injury across the sample, a very wide chronicity range for 13 people
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content_tags.quantities[18]the tagger's words

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