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English

"Deciding with single spikes: sparse and rapid decoding in visual cortex"
Dr. Geoff M. Ghose (Univ. of Minnesota)

生命機能研究科(豊中キャンパス)にてGeoffrey M. Ghose博士によるセミナーが開かれます。
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"Deciding with single spikes: sparse and rapid decoding in visual cortex"
「少数のスパイクで決断する脳:視覚皮質におけるスパースで迅速なデコーディング」
Geoffrey M. Ghose, Ph.D.
Associate Professor, Department of Neuroscience, University of Minnesota
http://www.neurosci.umn.edu/faculty/ghose.html
http://www.ghoselab.cmrr.umn.edu

日時:2012年12月10日(月) 16:00~18:00
場所:(豊中キャンパス)基礎工学部 J棟 3階セミナー室J306
http://ohzawa-lab.bpe.es.osaka-u.ac.jp/toyonaka-maps-e.html

Abstract:
Perception and decision making depend on both the accurate encoding of sensory information by neurons and the subsequent decoding of those neurons to form percepts and guide actions. While much attention has been focused on "sparse" representations of visual information, relatively little attention has been devoted to the "read-out" or decoding of neuronal populations. Are decisions based on the sampling of a small number of critical neurons or individual neurons so noisy that substantially averaging is necessary? In this talk, I will examine the this question by recording and stimulating from monkeys engaged in two types of decisions: a rapid perceptual decision requiring attention, and a cognitive decision requiring internal time-keeping. Using a novel application of information theory and micro stimulation, we conclude that, surprisingly, and for both tasks, decoding is sparse in both time and across neurons. This suggests that a wide class of decisions may be based solely on the occurrence of a small number of action potentials from the specific neurons that are best suited to the task.


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