[Changes of Alpha Cortical Potentials Spatial Synchronization on Value Go/NoGo Stimuli].

At healthy people (n = 35) on model of the cognitive set on an angry face is shown: introduction of positive and negative coordinated stimuli Go/NoGo in the inter-stimuli interval can change considerably the top-down positive and negative influences of prefrontal cortex on the cortical areas participating in a visual perception and by that to influence plasticity of the set. The cortical topography of the top-down influences in response to NoGo is determined by local changes of power of fluctuations of potentials in alpha rhythm range. Changes of spatial synchronization of alpha potentials occurs only in their low-frequency range, depending on the level of plasticity of the set.

[Relationships between the Flexibility of Cognitive Performance and the Response of Alpha-Rhythm in the Go/NoGo Task].

During the experiments, healthy subjects (n = 35) completed Go/NoGo task with a set towards the recognition of negative face expression; the visual stimuli were set in the middle of a 16-second-long interval between target (face) and triggering stimuli. The local changes in low-frequency alpha-oscillations in response to stimuli (desynchronization after a positive Go stimulus and synchronization after an inhibitory NoGo stimulus) take place in posterior frontal and anterior temporal lobes of the left hemisphere, i.e.

[The role of the top-down inhibitory control in providing flexibility of cortical processes of recognition of emotional face expression].

On the ground of own and those found in literature it is argued that the neural mechanism of implicit estimation of time intervals between significant visual events should be considered in the framework of top-down cognitive control. Based on that view, putative mechanism of active inhibition are considered. Based on the set model on recognition of emotionally negative face expression it is shown that implicit estimation of time intervals between significant visual events plays an important role in providing flexibility of cognitive processes.

[The spatial synchronization and power of the alpha and theta rhythm after action of signals Go/NoGo].

At adult healthy subjects (n = 35) in pause between the target (facial expression) and triggering stimuli showed the conditioning signals of Go/NoGo defining significants of triggering stimulus. The low-frequency alpha rhythm reacts to stimuli Go/NoGo in the left hemisphere more strongly. The coherence of low-frequency alpha potentials on 5-7 second after positive and negative conditioning (Go/NoGo) stimuli increases.

[Induced synchronization of alpha rhythm in the time intervals between the visual stimuli at different degrees of set flexibility].

In healthy adults (n = 35) was used the model the set study of recognition angry facial expression. The load on working memory by extending the interstimuli time up to 16 sec between the target (facial image) and starting (spot light) stimuli does not lead to a significant slowdown of switching of the set. Differences in the magnitude of the induced synchronization of the alpha rhythm in interstimulus period obtained in the subjects with the change in recognition of emotional facial expressions and the subjects "without errors".