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Proc. Natl. Acad. Sci. USA Vol. 93, pp. 11956-11961, October 1996
 

Summary: Proc. Natl. Acad. Sci. USA
Vol. 93, pp. 11956-11961, October 1996
Neurobiology
A model of multiplicative neural responses in parietal cortex
EMILIO SALINAS AND L. F. ABBOTT
Volen Center for Complex Systems, Brandeis University, Waltham, MA 02254-9110
Communicated by Nancy Kopell, Cambridge, MA, July 29, 1996 (received for review May 7, 1996)
ABSTRACT Visual responses of neurons in parietal area
7a are modulated by a combined eye and head position signal
in a multiplicative manner. Neurons with multiplicative re-
sponses can act as powerful computational elements in neural
networks. In the case of parietal cortex, multiplicative gain
modulation appears to play a crucial role in the transforma-
tion of object locations from retinal to body-centered coordi-
nates. It has proven difficult to uncover single-neuron mech-
anisms that account for neuronal multiplication. Here we
show that multiplicative responses can arise in a network
model through population effects. Specifically, neurons in a
recurrently connected network with excitatory connections
between similarly tuned neurons and inhibitory connections

  

Source: Abbott, Laurence - Center for Neurobiology and Behavior & Department of Physiology and Cellular Biophysics, Columbia University

 

Collections: Biology and Medicine