Validating a standardised test battery for synesthesia: Does the Synesthesia Battery reliably detect synesthesia?
Synesthesia is a neurological condition that gives rise to unusual secondary sensations (e.g., reading letters might trigger the experience of colour). Testing the consistency of these sensations over long time intervals is the behavioural gold standard assessment for detecting synesthesia (e.g., Simner, Mulvenna et al., 2006). In 2007 however, Eagleman and colleagues presented an online 'Synesthesia Battery' of tests aimed at identifying synesthesia by assessing consistency but within a single test session. This battery has been widely used but has never been previously validated against conventional long-term retesting, and with a randomly recruited sample from the general population. We recruited 2847 participants to complete The Synesthesia Battery and found the prevalence of grapheme-colour synesthesia in the general population to be 1.2%. This prevalence was in line with previous conventional prevalence estimates based on conventional long-term testing (e.g., Simner, Mulvenna et al., 2006). This reproduction of similar prevalence rates suggests that the Synesthesia Battery is indeed a valid methodology for assessing synesthesia.
Dept. of Psychology, University of Edinburgh, 7 George Square, EH8 9JZ, UK; Institute for Adaptive & Neural Computation, University of Edinburgh, 10 Crichton Street, EH8 9AB, UK; Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, EH10 5HF, UK; School of Psychology, University of Sussex, Falmer BN1 9QH, UK. Electronic address: d.a.carmichael@ed.ac.uk.
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Carmichael
Institute for Adaptive & Neural Computation, University of Edinburgh, 10 Crichton Street, EH8 9AB, UK.
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Down
Dept. of Psychology, University of Edinburgh, 7 George Square, EH8 9JZ, UK; Institute for Adaptive & Neural Computation, University of Edinburgh, 10 Crichton Street, EH8 9AB, UK.
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Shillcock
Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA.
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Eagleman
Dept. of Psychology, University of Edinburgh, 7 George Square, EH8 9JZ, UK; School of Psychology, University of Sussex, Falmer BN1 9QH, UK.
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Simner
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003118:Color Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000592:standards*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010468:Perceptual Disorders / Q000175:diagnosis* / Q000453:epidemiology; D015995:Prevalence; D000080311:Synesthesia; D055815:Young Adult
Assessment; Consistency; Grapheme-colour; Prevalence; Synesthesia; Test; Validation