1996 volume 25(9) pages 1073 – 1079

Cite as:
Baron-Cohen S, Burt L, Smith-Laittan F, Harrison J, Bolton P, 1996, "Synaesthesia: prevalence and familiality" Perception 25(9) 1073 – 1079

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Synaesthesia: prevalence and familiality

Simon Baron-Cohen, Lucy Burt, Fiona Smith-Laittan, John Harrison, Patrick Bolton

Received 7 November 1995, in revised form 5 June 1996

Abstract. Synaesthesia is a condition in which a mixing of the senses occurs; for example, sounds trigger the experience of colour. Previous reports suggest this may be familial, but no systematic studies exist. In addition, there are no reliable prevalence or sex-ratio figures for the condition, which is essential for establishing if the reported sex ratio (female bias) is reliable, and if this implicates a sex-linked genetic mechanism. Two independent population studies were conducted in the city of Cambridge, England (studies 1 and 2 here), as necessary background to the family genetic study of synaesthesia (study 3). Studies 1 and 2 arrived at an almost identical prevalence rate for synaesthesia: approximately 1 case in 2000. The sex ratio found was 6 : 1 (female : male). A third of cases also reported familial aggregation. In study 3 six families were examined, and first-degree relatives were tested for genuineness of the condition. All six families were indeed multiplex for synaesthesia. Alternative modes of inheritance are discussed.

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