Corticofugal Modulation of Sensory Information by Angel Nuñez PhD, Eduardo Malmierca MD (auth.)

By Angel Nuñez PhD, Eduardo Malmierca MD (auth.)

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1995; Popratiloff et al. 1997). These results have been confirmed by electrophysiological studies in vitro (see below). In the following part, we will show results that demonstrate the effect of corticofugal projections from the SI cortex on the dorsal column nuclei cells and the modulation of their tactile responses. Mechanisms of this corticofugal modulation have been studied in in vivo and in vitro preparations (Malmierca and Nuñez 1998, 2004; Buño and Nuñez 1999, 2001). These results are shown in the following paragraphs.

2002; Xiao and Suga 2005). This observation indicates that corticofugal neurons improve auditory signal processing in the frequency domain through their matched subcortical neurons. 2 kHz. On the other hand, inactivation of the cortical DSCF neurons augments the auditory responses of unmatched subcortical neurons at their best frequencies and shifts their best frequency toward the inactivated cortical best frequency. The amount of best frequency shift is proportional to the difference in best frequency between the recorded and inactivated neurons (Zhang and Suga 2000).

Consequently, the corticofugal projection may play an important role in the short-term plasticity of the somatosensory system since cortical stimulation induces facilitation or inhibition according to the activated cortical area. Fig. 6A, B Changes in the receptive field of gracilis neurons evoked by cortical stimulation with overlapping receptive fields. A A drawing of the receptive field of a representative gracilis neuron and the PSTHs of the responses evoked by tactile stimuli delivered in two different sites (site 1: functional center of the receptive field; site 2: periphery of the receptive field).

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