David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Ezio Di Nucci
Jack Alan Reynolds
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Proceedings of the Royal Society of London, B 268:979-983 (2001)
We studied two otherwise normal, synaesthetic subjects who `saw' a speci¢c colour every time they saw a speci¢c number or letter. We conducted four experiments in order to show that this was a genuine perceptual experience rather than merely a memory association. (i)The synaesthetically induced colours could lead to perceptual grouping, even though the inducing numerals or letters did not. (ii)Synaesthetically induced colours were not experienced if the graphemes were presented peripherally. (iii)Roman numerals were ine¡ective: the actual number grapheme was required. (iv)If two graphemes were alternated the induced colours were also seen in alternation. However, colours were no longer experienced if the graphemes were alternated at more than 4 Hz. We propose that grapheme colour synaesthesia arises from `cross-wiring' between the `colour centre' (area V4 or V8)and the `number area', both of which lie in the fusiform gyrus. We also suggest a similar explanation for the representation of metaphors in the brain: hence, the higher incidence of synaesthesia among artists and poets
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Jamie Ward, Ryan Li, Shireen Salih & Noam Sagiv (2006). Varieties of Grapheme-Colour Synaesthesia: A New Theory of Phenomenological and Behavioural Differences. Consciousness and Cognition 16 (4):913-931.
Uriah Kriegel (2013). A Hesitant Defense of Introspection. Philosophical Studies 165 (3):1165-1176.
Berit Brogaard, Kristian Marlow & Kevin Rice (forthcoming). Do Synesthetic Colors Grab Attention in Visual Search? Review of Philosophy and Psychology:1-14.
Julia Simner (2007). Beyond Perception: Synaesthesia as a Psycholinguistic Phenomenon. Trends in Cognitive Sciences 11 (1):23-29.
D. Smilek, A. CAllejas, M. Dixon & P. Merikle (2007). Ovals of Time: Time-Space Associations in Synaesthesia. Consciousness and Cognition 16 (2):507-519.
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