A paradigmatic working memory (attractor) cell in it cortex

Amit, Daniel J. and Fusi, Stefano and Yakovlev, Volodya (1997) A paradigmatic working memory (attractor) cell in it cortex. [Journal (Paginated)]

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We discuss paradigmatic properties of activity of single cells comprising an attractor -- a developed stable delay activity distribution. To demonstrate these properties and a methodology for measuring their values, we present a detailed account of the spike activity recorded from one single cell in infero-temporal (IT) cortex of a monkey performing a delayed match-to-sample (DMS) task of visual images. In particular, we discuss and exemplify: 1. the relation between spontaneous activity and activity immediately preceding the first stimulus in each trial during a series of DMS trials; 2. the effect on the visual response (i.e. activity {\bf during} stimulation) of stimulus degradation (moving in the space of IT afferents); 3. the behaviour of the delay activity (i.e. activity {\bf following} visual stimulation) under stimulus degradation (attractor dynamics, and the basin of attraction); and, 4. the propagation of information between trials -- the vehicle for the formation of (contextual) correlations by learning a fixed stimulus sequence, as found in Miyashita 1988. In the process of the discussion and demonstration, we expose effective tools for the identification and characterisation of attractor dynamics.

Item Type:Journal (Paginated)
Keywords:IT cortex, delay activity, attractors, single-unit recording, delay-match-to-sample task, spike-rate correlations, neural network, modeling,
Subjects:Neuroscience > Behavioral Neuroscience
Neuroscience > Computational Neuroscience
Neuroscience > Neural Modelling
Neuroscience > Neurophysiology
ID Code:63
Deposited By: Amit, Daniel J.
Deposited On:27 Aug 1998
Last Modified:11 Mar 2011 08:53


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