Suprathreshold intrinsic dynamics of the human visual system



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Neural Computation


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.




Copyright 2003 Neural Computation. Recommended citation: Purushothaman, Gopathy, Haluk Öğmen, and Harold E. Bedell. "Suprathreshold intrinsic dynamics of the human visual system." Neural computation 15, no. 12 (2003): 2883-2908. doi: 10.1162/089976603322518786. URL: Reproduced in accordance with licensing terms and with author permission.