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(Neural Computation. 2003;15:2883-2908.)
© 2003 The MIT Press

Letter

Suprathreshold Intrinsic Dynamics of the Human Visual System

Gopathy Purushothaman

gopathy{at}uchicago.edu, Department of Electrical and Computer Engineering, University of Houston, Houston, TX 77204-4005, U.S.A.

Haluk Ögmen

ogmen{at}uh.edu, Department of Electrical and Computer Engineering and Center for Neuro-Engineering and Cognitive Science, University of Houston, Houston, TX 77204-4005, U.S.A.

Harold E. Bedell

hbedell{at}optometry.uh.edu, College of Optometry and Center for Neuro-Engineering and Cognitive Science, University of Houston, Houston, TX 77204-4005, U.S.A.

Intrinsic high-frequency neural activities have been observed in the visual system of several species, but their functional significance for visual perception remains a fundamental puzzle in cognitive neuroscience. Spatiotemporal integration in the human visual system acts as a low-pass filter and makes the psychophysical observation of high-frequency activities very difficult. A computational model of retino-cortical dynamics (RECOD) is used to derive experimental paradigms that allow psychophysical studies of high-frequency neural activities. A reduced-parameter version of the model is used to quantitatively relate psychophysical data collected in two of these experimental paradigms. Statistical analysis shows that the model's account of the variance in the data is, in general, highly significant. We suggest that psychophysically measured oscillations reflect intrinsic neuronal oscillations observed in the visual cortex.






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J COGNITIVE NEUROSCIENCE NEURAL COMPUTATION MIT PRESS JOURNALS
Copyright © 2003 by The MIT Press.