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The Journal of Neuroscience, April 15, 2003, 23(8):3407

Internal State of Monkey Primary Visual Cortex (V1) Predicts Figure-Ground Perception

Hans Supèr^{1, 2}, Chris van der Togt^{1, 2}, Henk Spekreijse¹, and Victor A. F. Lamme^{1, 2, 3}

¹ Graduate School Neurosciences Amsterdam, Department Visual System Analysis, Academic Medical Center, University of Amsterdam, 1100 AA Amsterdam, The Netherlands, ² The Netherlands Ophthalmic Research Institute, 1105 BA Amsterdam, The Netherlands, and ³ Department of Psychology, University of Amsterdam, 1018 WB, Amsterdam, The Netherlands

When stimulus information enters the visual cortex, it is rapidly processed for identification. However, sometimes the processing of the stimulus is inadequate and the subject fails to notice the stimulus. Human psychophysical studies show that this occurs during states of inattention or absent-mindedness. At a neurophysiological level, it remains unclear what these states are. To study the role of cortical state in perception, we analyzed neural activity in the monkey primary visual cortex before the appearance of a stimulus. We show that, before the appearance of a reported stimulus, neural activity was stronger and more correlated than for a not-reported stimulus. This indicates that the strength of neural activity and the functional connectivity between neurons in the primary visual cortex participate in the perceptual processing of stimulus information. Thus, to detect a stimulus, the visual cortex needs to be in an appropriate state.

Key words: cortical state; multiunit recording; neurophysiology; V1; primary visual cortex; figure-ground; perception; visual processing; monkey

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Copyright © 2003 Society for Neuroscience  0270-6474/03/2383407-08$05.00/0

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