Macaque monkeys categorize images by their ordinal number

Article Abstract:

The natural and dominant strategy of macaque monkeys for recalling ordered sequences of images is the retrieval of ordinal categories for long-term memory. It was found that the monkeys also used secondary strategies, including memory of the sample images and associations between sequence triplet members, eventually to avoid distractor images. Monkeys naturally labelled the images as first, second and third, on the basis of their temporal order, but they probably could not store the sequential order of a triplet of images in working memory. There is currently no information about the neural mechanisms on which categorization of ordinal number is based.

Cognition, Animal memory, Macaques

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Task difficulty and the specificity of perceptual learning

Article Abstract:

Research into the specificity of perceptual learning indicates that learning generalizes across orientation and retinal position in the case of easy learning conditions. When learning tasks are made harder, learning grows more specific in terms of both orientation and position. It is possible to conclude that modifications take place at various levels of the visual system, in reverse hierarchical order. Apparently contradictory data can be explained by attributing strategies for improvement which appear different from changes within different underlying neuronal sites.

Perceptual learning

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Temporal gating of neural signals during performance of a visual discrimination task

Article Abstract:

A critical role for the middle temporal visual area (MT) is indicated in the analysis of visual motion information. Directional signals in MT are important in the generation of psychophysical performance, and experiments have been undertaken to compare the efficacy of microstimulation given before, during and after presentation of a visual stimulus, to rhesus monkeys. The behavioural effects of microstimulation varied dramatically according to the delivery timing, suggesting that signals produced by microstimulation could be subject to active gating.

Observations, Neural stimulation

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