title: [Evoked negative cortical wave as a reflection of selective attention].
abstract: The study is devoted to the negative wave which sets in the cerebral cortex in response to a significant stimulus. Such negativity may be detected by way of subtracting from the amplitude of the EP to the significant stimulus of the amplitude of the EP to a less significant one. It was found that the negativity consists of two components: the first one, with a peak latency of 140 ms, is most pronounced in the analyser projection zone; it may be recorded during both voluntary and involuntary attention and is apparently due to selective activation of the cortex by the ascending thalamocortical system. The second peak, with a latency of 200 ms, is diffusely spread over the cortex and is recorded only during voluntary attention; it may be caused by activation of the cortex by the mesencephalic reticular formation.
mesh_terms: D001288:Attention / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D013181:Cortical Spreading Depression; D004056:Differential Threshold; D004558:Electric Stimulation; D005071:Evoked Potentials; D006801:Humans; D011930:Reaction Time / Q000502:physiology*
vernacular_title: Korkovaia vyzvannaia negativnaia volna kak otrazhenie selektivnogo vnimaniia.