Synaesthesia Essay

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Conjoined Sensations: A Literature Review of Synesthesia Abstract Synesthesia is a condition in which stimulus that is typically perceived in one sensory modality produces a sensation in one or more of the other sensory modalities. This paper analyzes research that focuses on the neurological basis of synesthesia, with an emphasis on three of the main theoretical models that attempt to explain cause of this condition: the cross activation model, the disinhibited feedback model, and the re-entrant model. I discuss some of the limitations and issues that exist in the literature surrounding synesthesia, including the subjective nature of the phenomenon, and the tendency of researchers to focus on only one of the theoretical models at a time. Suggestions for future research are discussed, including the importance of taking the various subtypes of synesthesia into account, and considering the possibility that all of the theoretical models operate concurrently. Introduction Synaesthesia is a neurological condition in which the stimulation of one sense causes the perceptual experience of another (Hochel and Milan, 2008, p. 93). Individuals who experience synaesthesia, known as synaesthetes, begin to experience synesthetic perceptions in early childhood, and these experiences “remain extremely consistent over the lifespan” (Brang, Hubbard, Coulson, Huang, and Ramachandran, 2010, p. 268). There are many different manifestations of synaesthesia, including auditory-visual synesthesia, in which “sounds automatically elicit conscious and reliable visual experiences” (Goller, Otten, and Ward, 2008, p. 1869), and grapheme-color synesthesia, in which “letters and numbers consistently evoke particular colors” (Brang et al., 2010, p. 268). Synesthesia can also involve other senses, such as touch, taste, and smell, and may even “involve multiple extraordinary sensory

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