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SUMMARY:Working memory swap errors have identifiable neural representation
 s - Stella Wernicke
DTSTART:20240724T130000Z
DTEND:20240724T140000Z
UID:TALK219445@talks.cam.ac.uk
CONTACT:Adam Triabhall
DESCRIPTION:This week we will discuss and debate a recent paper by Mallet 
 and colleagues\, published in the Journal of Cognitive Neuroscience (2022)
 .\n\nAbstract: “Working memory is an essential component of cognition th
 at facilitates goal-directed behavior. Famously\, it is severely limited a
 nd performance suffers when memory load exceeds an individual’s capacity
 . Modeling of visual working memory responses has identified two likely ty
 pes of errors: guesses and swaps. Swap errors may arise from a mis-binding
  between the features of different items. Alternatively\, these errors cou
 ld arise from memory noise in the feature dimension used for cueing a to-b
 e-tested memory item\, resulting in the wrong item being selected. Finally
 \, it is possible that so-called “swap errors” actually reflect inform
 ed guessing\, which could occur at the time of a cue\, or alternatively\, 
 at the time of the response. Here\, we combined behavioral response modeli
 ng and fMRI pattern analysis to test the hypothesis that swap errors invol
 ve the active maintenance of an incorrect memory item. After the encoding 
 of six spatial locations\, a retro-cue indicated which location would be t
 ested after memory retention. On accurate trials\, we could reconstruct a 
 memory representation of the cued location in both early visual cortex and
  intraparietal sulcus. On swap error trials identified with mixture modeli
 ng\, we were able to reconstruct a representation of the swapped location\
 , but not of the cued location\, suggesting the maintenance of the incorre
 ct memory item prior to response. Moreover\, participants subjectively res
 ponded with some level of confidence\, rather than complete guessing\, on 
 a majority of swap error trials. Together\, these results suggest that swa
 p errors are not mere response-phase guesses\, but instead result from fai
 lures of selection in working memory\, contextual binding errors\, or info
 rmed guesses\, which produce active maintenance of incorrect memory repres
 entations” (Mallet et al.\, 2022).\n\nReference: Mallett\, R.\, Lorenc\,
  E. S.\, & Lewis-Peacock\, J. A. (2022). Working Memory Swap Errors Have I
 dentifiable Neural Representations. Journal of Cognitive Neuroscience\, 34
 (5)\, 776–786. https://doi.org/10.1162/jocn_a_01831
LOCATION:https://cam-ac-uk.zoom.us/j/92612577704?pwd=MUtqMjVQdXNmUTVIYjRkM
 G1NUW9GZz09
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