ERIC Number: EJ1035419
Record Type: Journal
Publication Date: 2014-Jun
Abstractor: As Provided
Monkeys Rely on Recency of Stimulus Repetition When Solving Short-Term Memory Tasks
Wittig, John H., Jr.; Richmond, Barry J.
Learning & Memory, v21 n6 p325-333 Jun 2014
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.
Descriptors: Animals, Animal Behavior, Short Term Memory, Visual Stimuli, Interference (Learning), Performance, Responses, Repetition, Memorization, Reaction Time, Recognition (Psychology)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A