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J Neurophysiol (June 21, 2006). doi:10.1152/jn.00404.2006
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Submitted on April 17, 2006
Accepted on June 16, 2006

Two Dimensional Coincidence Detection in the Vibrissa/Barrel Field

Krista M Rodgers1, Alexander M Benison1, and Daniel S. Barth1*

1 Psychology, University of Colorado, Boulder, Colorado, United States

* To whom correspondence should be addressed. E-mail: dbarth{at}psych.colorado.edu.

Coincidence detection in visual and auditory cortex may also be critical for feature analysis in somatosensory cortex. We examined its role in the rat posterio-medial barrel subfield (PMBSF) using high-resolution arrays of epipial electrodes. Five vibrissae, forming an arc, row, or diagonal, were simultaneously or asynchronously stimulated to simulate contact with a straight edge of different angles at natural whisking velocities. Results indicated super-linear responses for both slow wave and fast oscillations (FO; ~ 350 Hz) at inter-vibrissa delays < 2ms. FO represented the earliest and most precisely tuned response to coincident vibrissa displacement. There was little difference in the spatiotemporal pattern of slow wave or FO responses in the row, arc, or diagonal. This equivalence of function suggests that the PMBSF may be capable of working as a two dimensional integrative array, processing spatial features based on coincidence detection despite the direction that the vibrissae pass across an object.




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