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Subjective Characteristics of TMS-Induced Phosphenes Originating in Human V1 and V2 by Niina Salminen-Vaparanta; Simo Vanni; Valdas Noreika; Vladas Valiulis; Levente Móró; Antti Revonsuo is a Neuroscience article available to read on EtoBox.

What is Subjective Characteristics of TMS-Induced Phosphenes Originating in Human V1 and V2 about?

One way to study the neural correlates of visual consciousness is to localize the cortical areas whose stimulation generates subjective visual sensations, called phosphenes. While there is support for the view that the stimulation of several different visual areas in the occipital lobe may produce phosphenes, it is not clear what the contribution of each area is. Here, we studied the roles of the primary visual cortex (V1) and the adjacent area V2 in eliciting phosphenes by using functional magnetic resonance imaging-guided transcranial magnetic stimulation (TMS) combined with spherical modeling of the TMS-induced electric field. Reports of the subjective visual features of phosphenes were systematically collected and analyzed. We found that selective stimulation of V1 and V2 are equally capable of generating phosphenes, as demonstrated by comparable phosphene thresholds and similar characteristics of phosphene shape, color, and texture. However, the phosphenes induced by V1 stimulation were systematically perceived as brighter than the phosphenes induced by the stimulation of V2. Thus, these results suggest that V1 and V2 have a similar capability to produce conscious percepts. Ne

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Author

Niina Salminen-Vaparanta; Simo Vanni; Valdas Noreika; Vladas Valiulis; Levente Móró; Antti Revonsuo

Publisher

Oxford University Press (OUP)

Published

2013

Language

EN

Field

Neuroscience (Life Sciences)