Abstract
Existing literature on sensory deprivation suggests that short-lasting periods of dark adaptation (DA) can cause changes in visual cortex excitability. DA cortical effects have previously been assessed through phosphene perception, i.e., the ability to report visual sensations when a transcranial magnetic stimulation (TMS) pulse is delivered over the visual cortex. However, phosphenes represent an indirect measure of visual cortical excitability which relies on a subjective report. Here, we aimed at overcoming this limitation by assessing visual cortical excitability by combining subjective (i.e., TMS-induced phosphenes) and objective (i.e., TMS-evoked potentials - TEPs) measurements in a TMS-EEG protocol after 30 min of DA. DA effects were compared to a control condition, entailing 30 min of controlled light exposure. TMS was applied at 11 intensities in order to estimate the psychometric function of phosphene report and explore the relationship between TEPs and TMS intensity. Compared to light adaptation, after DA the slope of the psychometric function was significantly steeper, and the amplitude of a TEP component (P60) was lower, only for high TMS intensities. The perceptual threshold was not affected by DA. These results support the idea that DA leads to a change in the excitability of the visual cortex, accompanied by a behavioral modification of visual perception. Furthermore, this study provides a first valuable description of the relationship between TMS intensity and visual TEPs.
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We would like to thank Clarissa Ferrari for her valuable help and suggestions about statistics.
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10548_2019_715_MOESM1_ESM.tif
Supplementary material 1 (TIFF 6095 kb). Fig. S1 (Supplementary) Effect of TMS intensity on late-latency TEPs (N100, P150, P280) after DA and LA. Top: topographical maps of each component (amplitude range as shown in colorbar); squares indicate the channel where the maximum amplitude was recorded for each component selected to plot the average waveform below. Bottom: TEP grand-average as function of TMS intensity (low: green; medium: magenta; high: blue) and adaptation conditions (DA: first row; LA: second row); vertical bars indicate the latency of each component
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Zazio, A., Bortoletto, M., Ruzzoli, M. et al. Perceptual and Physiological Consequences of Dark Adaptation: A TMS-EEG Study. Brain Topogr 32, 773–782 (2019). https://doi.org/10.1007/s10548-019-00715-x
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DOI: https://doi.org/10.1007/s10548-019-00715-x