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Experience-dependent representation of visual categories in parietal cortex

Summary: Experience-dependent representation of visual
categories in parietal cortex
David J. Freedman1
& John A. Assad1
Categorization is a process by which the brain assigns meaning to
sensory stimuli. Through experience, we learn to group stimuli
into categories, such as `chair', `table' and `vehicle', which are
critical for rapidly and appropriately selecting behavioural
. Although much is known about the neural represen-
tation of simple visual stimulus features (for example, orientation,
direction and colour), relatively little is known about how the
brain learns and encodes the meaning of stimuli. We trained
monkeys to classify 3608 of visual motion directions into two
discrete categories, and compared neuronal activity in the lateral
intraparietal (LIP) and middle temporal (MT) areas, two inter-
connected brain regions3
known to be involved in visual motion
. Here we show that neurons in LIP--an area known


Source: Andrzejak, Ralph Gregor - Departament de Tecnologia, Universitat Pompeu Fabra


Collections: Computer Technologies and Information Sciences