Changes in the Spatial Synchronization of Electrical Potentials in the Neocortex at Different Time Periods between Stimuli on Acquisition of a Set to an Emotionally Negative Facial Expression

Kostandov, E.; Cheremushkin, E.
March 2014
Neuroscience & Behavioral Physiology;Mar2014, Vol. 44 Issue 3, p277
Academic Journal
Studies in healthy humans ( n = 35) were performed using a model of a set to an emotionally negative facial expression with an 8-sec interval between the target (facial image) and trigger signals. Coherence functions for alpha and theta potentials at different parts of the cerebral cortex of the left and right hemispheres were studied at different time intervals during the pre- and post-stimulus periods. The following dynamic was seen: the source of modulation of attention consisted of the internal concept of time intervals between significant stimuli formed in the prefrontal cortex as a result of learning. Analysis of changes in the spatial synchronization of theta potentials at different stages of the set to an 'angry' face provided grounds for believing that the corticohippocampal system does not have any direct link with assessment of time intervals, but is associated with the function of emotional memory.


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