Journal of Consciousness Studies 8 (12):3-34 (2001)
|Abstract||(1) The induced colours led to perceptual grouping and pop-out, (2) a grapheme rendered invisible through ‘crowding’ or lateral masking induced synaesthetic colours — a form of blindsight — and (3) peripherally presented graphemes did not induce colours even when they were clearly visible. Taken collectively, these and other experiments prove conclusively that synaesthesia is a genuine percep- tual phenomenon, not an effect based on memory associations from childhood or on vague metaphorical speech. We identify different subtypes of number–colour synaesthesia and propose that they are caused by hyperconnectivity between col- our and number areas at different stages in processing; lower synaesthetes may have cross-wiring (or cross-activation) within the fusiform gyrus, whereas higher synaesthetes may have cross-activation in the angular gyrus. This hyperconnec- tivity might be caused by a genetic mutation that causes defective pruning of con- nections between brain maps. The mutation may further be expressed selectively (due to transcription factors) in the fusiform or angular gyri, and this may explain the existence of different forms of synaesthesia. If expressed very diffusely, there may be extensive cross-wiring between brain regions that represent abstract concepts, which would explain the link between creativity, metaphor and synaesthesia (and the higher incidence of synaesthesia among artists and poets). Also, hyperconnectivity between the sensory cortex and amygdala would explain the heightened aversion synaesthetes experience when seeing numbers printed in the ‘wrong’ colour. Lastly, kindling (induced hyperconnectivity in the temporal lobes of temporal lobe epilepsy [TLE] patients) may explain the purported higher incidence of synaesthesia in these patients. We conclude with a synaesthesia-based theory|
|Keywords||No keywords specified (fix it)|
|Through your library||Configure|
Similar books and articles
Simon Baron-Cohen, D. Bor, J. Billington, J. Asher, S. Wheelwright & C. Ashwin (2007). Savant Memory in a Man with Colour Form-Number Synaesthesia and Asperger. Journal of Consciousness Studies 14 (s 9-10):237-251.
Richard Gray (2001). Synesthesia and Misrepresentation: A Reply to Wager. Philosophical Psychology 14 (3):339-46.
A. Wager (1999). The Extra Qualia Problem: Synaesthesia and Representationism. Philosophical Psychology 12 (3):263-281.
Jamie Ward & Noam Sagiv (2007). Synaesthesia for Finger Counting and Dice Patterns: A Case of Higher Synaesthesia? Neurocase 13 (2):86-93.
Roger Walsh (2005). Can Synaesthesia Be Cultivated?: Indications From Surveys of Meditators. Journal of Consciousness Studies 12 (s 4-5):5-17.
Richard Gray (2001). Cognitive Modules, Synaesthesia and the Constitution of Psychological Natural Kinds. Philosophical Psychology 14 (1):65-82.
Vilayanur S. Ramachandran & Edward M. Hubbard (2003). The Phenomenology of Synaesthesia. Journal of Consciousness Studies 10 (8):49-57.
Fiona Macpherson (2007). Synaesthesia. In Mario de Caro, Francesco Ferretti & Massimo Marraffa (eds.), Cartographies of the Mind: Philosophy and Psychology in Intersection Series: Studies in Brain and Mind, Vol. 4. Kleuwer.
Vilayanur S. Ramachandran & Edward M. Hubbard (2001). Psychophysical Investigations Into the Neural Basis of Synaesthesia. Proceedings of the Royal Society of London, B 268:979-983.
Added to index2009-01-28
Total downloads92 ( #7,357 of 549,068 )
Recent downloads (6 months)14 ( #4,536 of 549,068 )
How can I increase my downloads?