Stimulus-driven and anticipatory attention differentially modulate primary visual cortex

• Autorzy: Bekisz M. , Bogdan W. , Ghazaryan A. , Waleszczyk W.J. , Kublik E. , Wrobel A.
• Języki publikacji: EN

Abstrakty

EN

Only a fraction of the visual information can be consciously processed. The mechanism by which stimuli are selected for mindful processing is based on current behavioral situation and involves selective attention. Attention can be focused either volitionally by anticipatory signals, derived by task demands, or automatically by bottom-up signals from salient stimuli. Since brain mechanisms underlying these two processes of attention, are poorly understood, we performed electrophysiological experiments with chronic recordings from visual cortex of behaving cats engaged in delayed visual and auditory spatial discrimination task. Our previous results showing that both attentional tasks were accompanied by enhanced activity in beta frequency band in visual cortical areas 17 and 18 led us to the hypothesis that beta signals serve as attention carrier. We have now searched whether attention-related beta activity would influence cortical responses to electrical peripheral stimulation. We compared potentials (EPs) evoked by the optic chiasm stimulation in primary visual cortical areas during ongoing high or low amplitude beta signals. Under anticipatory attentional task peripheral stimuli preceded by a 200 ms high-amplitude beta signals evoked larger amplitude EPs as compared to those which followed low-amplitude beta activity. In contrast, during bottom-up attentional condition cortical EPs preceded by high beta oscillation, were on average smaller than those following low beta signals. Correlation analysis between beta signals at different recording sites showed that bottom-up task activated cortical beta frequency maps in a mosaic-like pattern whereas anticipatory modulation resulted in spatially homogeneous beta excitation. Taken together, our results suggest that enhanced beta activity during the two attentive conditions shape the functional organization of cortical networks into substantially different spatial patterns.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2015
• Tom: 75
• Numer: Supl.
• Opis fizyczny: p.S33

Twórcy

autor

Bekisz M.

• Department of Neurophysiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland

autor

Bogdan W.

• Department of Neurophysiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland

autor

Ghazaryan A.

• Department of Neurophysiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland

autor

Waleszczyk W.J.

• Department of Neurophysiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland

autor

Kublik E.

• Department of Neurophysiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland

autor

Wrobel A.

• Department of Neurophysiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland