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Monkeys rely on recency of stimulus repetition when solving short-term memory tasks. | LitMetric

Monkeys rely on recency of stimulus repetition when solving short-term memory tasks.

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Laboratory of Neuropsychology, National Institute of Mental Health, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892-4415, USA.

Published: May 2014

AI Article Synopsis

  • Seven monkeys were tested on two short-term memory tasks to explore selective versus nonselective memory processes.
  • In the first task, monkeys identified if a test image matched one from a recent list, performing better with newer images, suggesting they remembered all images nonselectively.
  • The second task aimed to focus on just the first image while ignoring distractions, but even then, they often mistook distractors for the original image, indicating a tendency for nonselective memorization based on the recency of viewing any image.

Article Abstract

Seven monkeys performed variants of two short-term memory tasks that others have used to differentiate between selective and nonselective memory mechanisms. The first task was to view a list of sequentially presented images and identify whether a test matched any image from the list, but not a distractor from a preceding list. Performance was best when the test matched the most recently presented image. Response rates depended linearly on recency of repetition whether the test matched a sample from the current list or a distractor from a preceding list, suggesting nonselective memorization of all images viewed instead of just the sample images. The second task was to remember just the first image in a list selectively and ignore subsequent distractors. False alarms occurred frequently when the test matched a distractor presented near the beginning of the sequence. In a pilot experiment, response rates depended linearly on recency of repetition irrespective of whether the test matched the first image or a distractor, again suggesting nonselective memorization of all images instead of just the first image. Modification of the second task improved recognition of the first image, but did not abolish use of recency. Monkeys appear to perform nonspatial visual short-term memory tasks often (or exclusively) using a single, nonselective, memory mechanism that conveys the recency of stimulus repetition.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4024622PMC
http://dx.doi.org/10.1101/lm.034181.113DOI Listing

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