SHORT COMMUNICATION Attention-dependent coupling between beta activities recorded in the cat's thalamic and cortical representations of the central visual field

摘要: We have previously proposed that enhanced 16–24 Hz (beta) local field potential activity in the primary visual cortex and lateral geniculate nucleus may be an electrophysiological correlate of attentional mechanism increases gain afferent information flow to cortex. In this study, we measured coupling between beta signals recorded thalamic (i.e. or perigeniculate) cortical representations central (within 58 from area centralis), during auditory attentive situations. Signal was calculated two ways: (i) by means crosscorrelation raw activities, which depends primarily on phase coherence, (ii) phase-independent amplitude envelopes activities. Mean amplitudes signal crosscorrelations obtained for thalamo-cortical recording pairs were not significantly different when behavioural demands either attention. contrast, envelope behaviour requiring attention were, average, times higher than those task. This attention-related emerged synchronized modulation oscillatory occurs within cortico-thalamic circuit involved vision.