A frontal transcallosal inhibition loop mediates interhemispheric balance in visuospatial processing.

Autor: Wang, Yanjie, Chen, Zhaonan, Ma, Guofen, Wang, Lizhao, Liu, Yanmei, Qin, Meiling, Fei, Xiang, Wu, Yifan, Xu, Min, Zhang, Siyu
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Zdroj: Nature Communications; 8/25/2023, Vol. 14 Issue 1, p1-21, 21p
Abstrakt: Interhemispheric communication through the corpus callosum is required for both sensory and cognitive processes. Impaired transcallosal inhibition causing interhemispheric imbalance is believed to underlie visuospatial bias after frontoparietal cortical damage, but the synaptic circuits involved remain largely unknown. Here, we show that lesions in the mouse anterior cingulate area (ACA) cause severe visuospatial bias mediated by a transcallosal inhibition loop. In a visual-change-detection task, ACA callosal-projection neurons (CPNs) were more active with contralateral visual field changes than with ipsilateral changes. Unilateral CPN inactivation impaired contralateral change detection but improved ipsilateral detection by altering interhemispheric interaction through callosal projections. CPNs strongly activated contralateral parvalbumin-positive (PV+) neurons, and callosal-input-driven PV+ neurons preferentially inhibited ipsilateral CPNs, thus mediating transcallosal inhibition. Unilateral PV+ neuron activation caused a similar behavioral bias to contralateral CPN activation and ipsilateral CPN inactivation, and bilateral PV+ neuron activation eliminated this bias. Notably, restoring interhemispheric balance by activating contralesional PV+ neurons significantly improved contralesional detection in ACA-lesioned animals. Thus, a frontal transcallosal inhibition loop comprising CPNs and callosal-input-driven PV+ neurons mediates interhemispheric balance in visuospatial processing, and enhancing contralesional transcallosal inhibition restores interhemispheric balance while also reversing lesion-induced bias. Impaired transcallosal inhibition is believed to underlie visuospatial bias after frontoparietal damage, but the synaptic circuits involved remain largely unknown. Here, authors show a transcallosal inhibition loop in the anterior cingulate area that functions in visuospatial processing by maintaining balanced interhemispheric interactions. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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