Abstract
Primary visual cortex has been repeatedly implicated in grapheme-colour synaesthesia but the role it plays in supporting different characteristics of this condition, and its connection with perceptual awareness, remain poorly understood. Here I will describe recent research concerning cortical excitability and neurochemical concentrations in primary visual cortex and their cognitive and phenomenological correlates in synaesthesia. I will further demonstrate that modulating cortical excitability in primary visual cortex modifies the synaesthetic experience. This research sheds light on the role of primary visual cortex in synaesthesia and its link to consciousness, and provides further information regarding the neural basis of individual differences and enhanced cognition in this condition.
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