Hank S. Wan

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A century of behavioral studies has generated an abundance of proposals for how animals represent and navigate through space. Recently, neurophysiological recording in freely-behaving animals has begun to reveal cellular correlates of these cognitive processes, such as the existence of place cells in hippocampus and head direction cells in postsubiculum and(More)
O'Keefe 1991 has proposed that spatial information in rats might be represented as phasors: phase and amplitude of a sine wave encoding angle and distance to a landmark. We describe computer simulations showing that operations on phasors can be eeciently realized by arrays of spiking neurons that re-code the temporal dimension of the sine wave spatially.(More)
This model, utilizing coupled mechanisms for place recognition, maintenance of head direction, and path integration, replicates a variety o f r o d e n t behavioral and neurophysiological data. We simulated experiments by Collett, Cartwright, and Smith on gerbils performing a family of open-eld landmark-based search tasks, and experiments by Cheng on rats(More)
A model based on coupled mechanisms for place recognition, path integration, and maintenance of head direction in rodents replicates a variety of neurophysiological and behavioral data. Here we consider a task described in [Collett et al. 1986] in which gerbils were trained to find food equidistant from three identical landmarks arranged in an equilateral(More)
We describe a theoretical model of spatial representation in cortex, including computer simulations, that is compatible with data from single neuron recordings. Our proposed a r chitecture, called a sinusoidal array, encodes a polar vector ~ v = r; ; as distributed activity across a neuronal population. We demonstrate how sinusoidal arrays might be used for(More)
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