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We investigated the effect of selective whisker trimming on the development of the cortical representation of a whisker deflection in layer 2/3 of rat somatosensory cortex using in vivo voltage-sensitive dye (vsd) imaging. Responses to deflection of D-row whiskers were recorded after trimming of A-row, B-row, and C-row whiskers, referred to as DE pairing, during postnatal development. Animals DE paired from postnatal day (p) 7 to p17 had a significant bias in the spread of the vsd signal, favoring spread toward the concomitantly nondeprived E-row columns. This resulted primarily from a strong decrease in signal spreading into the deprived C-row columns. In contrast, signal spread in control littermates was approximately symmetrical. DE pairing failed to elicit significant changes when begun after p14, thus defining a critical period for this phenomenon. The results suggest that sensory deprivation in this model results in lower connectivity being established between nondeprived columns and adjacent deprived ones.

Plasticity of Representational Maps in Somatosensory Cortex Observed by In Vivo Voltage-Sensitive Dye Imaging