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Transcallosal inhibition dampens neural responses to high contrast stimuli in human visual cortex

Bocci, T ; Caleo, M ; Giorli, E ; Barloscio, D ; Maffei, L ; Rossi, S ; Sartucci, F

Neuroscience, 2011-07, Vol.187, p.43-51 [Periódico revisado por pares]

Amsterdam: Elsevier Ltd

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Título:
Transcallosal inhibition dampens neural responses to high contrast stimuli in human visual cortex
Autor: Bocci, T ; Caleo, M ; Giorli, E ; Barloscio, D ; Maffei, L ; Rossi, S ; Sartucci, F
Assuntos: Adult ; Biological and medical sciences ; corpus callosum ; Corpus Callosum - physiology ; Evoked Potentials, Visual - physiology ; Eye and associated structures. Visual pathways and centers. Vision ; Female ; Functional Laterality - physiology ; Fundamental and applied biological sciences. Psychology ; human visual cortex ; Humans ; Male ; Neural Pathways - physiology ; Neurology ; repetitive transcranial magnetic stimulation ; Transcranial Magnetic Stimulation ; Vertebrates: nervous system and sense organs ; Visual Cortex - physiology ; visual evoked potentials ; Visual Perception - physiology ; Young Adult
É parte de: Neuroscience, 2011-07, Vol.187, p.43-51
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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Descrição: Abstract Visual cortical areas in the two hemispheres interact via the corpus callosum, but the precise role of the callosal pathway in visual processing remains controversial. Here we have investigated the function of transcallosal projections in human primary visual cortex (V1). Visual evoked potentials (VEPs) triggered by grating stimuli of different contrasts were recorded before and after functional inactivation of the occipital cortex of one hemisphere via off-line low-frequency repetitive transcranial magnetic stimulation (rTMS; 0.5 Hz stimulation for 20 min). VEPs were recorded in V1 before (T0), immediately after (T1) and 45' following the completion of rTMS (T2). We found that low-frequency rTMS had an inhibitory effect on VEPs amplitudes at all contrasts in the treated side. Remarkably, reduction of VEP amplitudes in the inhibited hemisphere at T1 was accompanied by an increase in VEP amplitudes in the contralateral side only at mid-high contrasts (50–90%). This disinhibitory effect was observed with both central and hemifield stimulation. No changes in VEP amplitudes were observed when rTMS was applied to a cortical site more anterior with respect to V1. These data provide the first evidence that a mechanism of transcallosal inhibition dampens neural responses at high contrasts in human visual cortex.
Editor: Amsterdam: Elsevier Ltd
Idioma: Inglês

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Transcallosal inhibition dampens neural responses to high contrast stimuli in human visual cortex

Bocci, T ; Caleo, M ; Giorli, E ; Barloscio, D ; Maffei, L ; Rossi, S ; Sartucci, F

Amsterdam: Elsevier Ltd

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