The integration of direct bottom-up inputs with contextual information is a core feature of
neocortical circuits. In area V1, neurons may reduce their firing rates when their receptive …

Neuronal oscillations in the gamma band (30–80 Hz) have been suggested to play a central
role in feature binding or establishing channels for neural communication. For these …

Rhythmic activity of neuronal ensembles has been proposed to play an important role in
cognitive functions such as attention, perception, and memory. Here we investigate whether …

Selective attention lends relevant sensory input priority access to higher-level brain areas
and ultimately to behavior. Recent studies have suggested that those neurons in visual …

Gamma oscillations have been linked to selective attention. Here, we investigate the effects
of expecting a behaviorally relevant event (a change in the fixation point) on the oscillatory …

Perception and cognition require the integration of feedforward sensory information with
feedback signals. Using different sized stimuli, we isolate spectral signatures of feedforward …

Top-down modulation of sensory processing is a critical neural mechanism subserving
numerous important cognitive roles, one of which may be to inform lower-order sensory …

Cognition requires the dynamic modulation of effective connectivity, ie, the modulation of the
postsynaptic neuronal response to a given input. If postsynaptic neurons are rhythmically …

Current theories propose that coherence of oscillatory brain activity in the gamma band (30–
80 Hz) constitutes an avenue for communication among remote neural populations …

Gamma oscillation (GAMMA) in the local field potential (LFP) is a synchronized activity
commonly found in many brain regions, and it has been thought as a functional signature of …