Repetition priming and repetition suppression: Multiple mechanisms in need of testing

Repetition priming and repetition suppression: Multiple mechanisms in need of testing Gotts Chow Martin

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Repetition priming and repetition suppression: Multiple mechanisms in need of testing 2012 Cognitive Neuroscience Gotts2012-repetition-priming-and-repetition-suppressio Gotts2012-repetition-priming-and-repetition-suppressio.txt, the project's staged copy 12794a8140bc9dd51257532154741e2d486512a8 not-redistributable neuroscience

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0 spans located by searching the stored text for the quote's exact words, allowing any whitespace between them mechanism Quotation withheld because this record is not cleared for redistribution. repetition priming and repetition suppression Quotation withheld because this record is not cleared for redistribution. review review Quotation withheld because this record is not cleared for redistribution. mechanisms Repetition makes task-engaged cells fire more synchronously even as their average rates fall, so processing becomes more efficient and behaviour improves despite reduced activity. Quotation withheld because this record is not cleared for redistribution. mechanisms Coincident input spikes sum on the receiving cell's membrane before the depolarization decays, so synchronous inputs cross spike threshold more reliably than the same number of asynchronous inputs. Quotation withheld because this record is not cleared for redistribution. mechanisms In the Bayesian alternative, learned top-down predictions inhibit the bottom-up sensory evidence, so the residual prediction error - and hence the measured activity - shrinks with repetition. Quotation withheld because this record is not cleared for redistribution. The favoured synchrony account has been evaluated empirically in very few studies. Quotation withheld because this record is not cleared for redistribution. Neither of the two surviving models has been subjected to a full set of experimental tests. Quotation withheld because this record is not cleared for redistribution. How long-term plasticity would link activity decreases to changes in synchrony is unclear. Quotation withheld because this record is not cleared for redistribution. a CONTROL CONDITION against which spike-LFP coherence in the gamma range was compared eliminates: that the synchronisation change is a general property of the recording rather than an effect of stimulus repetition · outcome (stated by the tagger, no quotation): held Quotation withheld because this record is not cleared for redistribution. the extreme form of the Explaining Away account was tested against the observed pattern eliminates: that ALL repetition suppression is high-level repetition expectation - the extreme version predicts a pattern the data do not show · outcome (stated by the tagger, no quotation): held Quotation withheld because this record is not cleared for redistribution. repetition priming repetition priming Quotation withheld because this record is not cleared for redistribution. repetition suppression repetition suppression Quotation withheld because this record is not cleared for redistribution. Sharpening Sharpening Quotation withheld because this record is not cleared for redistribution. neural synchronization neural synchronization Quotation withheld because this record is not cleared for redistribution. processing efficiency processing efficiency Quotation withheld because this record is not cleared for redistribution. THE PARADOX IN ONE SENTENCE, and it is a SIGN CONFLICT between two measures of one event: `Stimulus repetition in identification tasks leads to IMPROVED behavioral performance (repetition priming) but ATTENUATED neural responses (repetition suppression).` Behaviour gets better while the brain does less. Every mechanism in this paper exists to make those two facts one fact, and a corpus that recorded only `repetition improves performance` would lose the half that makes it interesting Quotation withheld because this record is not cleared for redistribution. FOUR ACCOUNTS OF ONE RELATIONSHIP, and the review's job is to keep them separate rather than to pick: FACILITATION (activity advanced in time - refuted for the typical case by single-cell recording, which finds firing curves to repeated stimuli SUBSUMED UNDER those to novel ones), SHARPENING (the poorly tuned cells drop out), SYNCHRONY (lower rates, tighter timing), and EXPLAINING AWAY (the Bayesian form of facilitation). Everyone agrees on improved efficiency; `the exact form that it takes remains elusive` Quotation withheld because this record is not cleared for redistribution. A REVIEW WHOSE VERDICT ON ITS OWN FAVOURITE IS A GAP: `Quotation withheld` The title says the same - `Multiple mechanisms IN NEED OF TESTING`. The contribution is an inventory of untested explanations, and the paper is explicit that its preferred one is preferred on promise rather than on evidence Quotation withheld because this record is not cleared for redistribution. contradicts → the Facilitation model (Henson, 2003; James et al., 2000) Quotation withheld because this record is not cleared for redistribution. replicates → Gilbert et al. (2010) Quotation withheld because this record is not cleared for redistribution. builds-on → Gotts (2003) neocortical circuit model Quotation withheld because this record is not cleared for redistribution. repetition priming —contrasted-with→ repetition suppression repetition priming repetition suppression differs in: THE DIRECTION EACH MOVES ON THE SAME EVENT - repetition IMPROVES the behavioural measure and ATTENUATES the neural one. Not two phenomena but two readings of one, pointing opposite ways, which is the puzzle the paper's four mechanisms exist to dissolve · strength of the relation: 0.95 · note: THE RECORD'S REASON FOR EXISTING. 'contrasted-with' rather than 'distinct-from': the paper is not separating two things, it is insisting they are one thing measured twice and asking why the signs disagree. Quotation withheld because this record is not cleared for redistribution. coherence coherence Quotation withheld because this record is not cleared for redistribution. Of the four candidate accounts reviewed, only the Facilitation model is judged definitively ruled out by existing data. Quotation withheld because this record is not cleared for redistribution. The authors judge the enhanced-synchronization account the most promising of the surviving proposals. Quotation withheld because this record is not cleared for redistribution. In their model, spike synchronization increased as firing rates decreased with repetition. Quotation withheld because this record is not cleared for redistribution. Their preliminary intracranial EEG study in two surgical patients found behavioural priming together with increased low-frequency evoked power at essentially every task-engaged electrode. Quotation withheld because this record is not cleared for redistribution. The same intracranial recordings showed increased fronto-temporal phase-locking with repetition, in alpha and low beta bands. Quotation withheld because this record is not cleared for redistribution. They propose that the processes producing synchronization and those producing activity decreases may be partly separate, which would explain reported dissociations between repetition suppression and priming. Quotation withheld because this record is not cleared for redistribution. repetition priming repetition priming Quotation withheld because this record is not cleared for redistribution. repetition suppression repetition suppression Quotation withheld because this record is not cleared for redistribution. Facilitation model Facilitation model Quotation withheld because this record is not cleared for redistribution. Sharpening Sharpening Quotation withheld because this record is not cleared for redistribution. explaining away explaining away Quotation withheld because this record is not cleared for redistribution. stimulus repetition stimulus repetition Quotation withheld because this record is not cleared for redistribution. low-frequency evoked power low-frequency evoked power Quotation withheld because this record is not cleared for redistribution. phase-locking phase-locking Quotation withheld because this record is not cleared for redistribution. two patients — number of epilepsy surgery patients in the authors' own preliminary electrocorticography study of object naming Quotation withheld because this record is not cleared for redistribution. 1–15 Hz — frequency band in which evoked power increased with stimulus repetition in their intracranial recordings Quotation withheld because this record is not cleared for redistribution. 8–12 Hz and 12–18 Hz — alpha and low-beta bands in which fronto-temporal phase-locking increased with repetition in their intracranial recordings Quotation withheld because this record is not cleared for redistribution.

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