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Memory Activity of LIP Neurons for Sequential Eye Movements Simulated With Neural Networks
 

Summary: Memory Activity of LIP Neurons for Sequential Eye Movements
Simulated With Neural Networks
JING XING AND RICHARD A. ANDERSEN
Division of Biology, California Institute of Technology, Pasadena, California 91125
Received 30 July 1999; accepted in final form 5 April 2000
Xing, Jing and Richard A. Andersen. Memory activity of LIP
neurons for sequential eye movements simulated with neural net-
works. J Neurophysiol 84: 651665, 2000. Many neurons in macaque
lateral intraparietal cortex (LIP) maintain elevated activity induced by
visual or auditory targets during tasks in which monkeys are required
to withhold one or more planned eye movements. We studied the
mechanisms for such memory activity with neural network modeling.
Recurrent connections among simulated LIP neurons were used to
model memory responses of LIP neurons. The connection weights
were computed using an optimization procedure to produce desired
outputs in memory-saccade tasks. One constraint for the training
process is the "single-purpose" rule, which mimics the fact that once
LIP neurons hold the memory activity of a saccade, they are insen-
sitive to further stimuli until the motor action is completed. After
training, excitatory connections were developed between units with

  

Source: Andersen, Richard - Division of Biology, California Institute of Technology

 

Collections: Biology and Medicine