In 1812, Georg Sachs published a medical dissertation concerning his own albinism and that of his sister. However, he also goes on to describe another phenomenon--namely synaesthesia involving colors for music and simple sequences (including numbers, days, and letters). Most contemporary researchers of synaesthesia fail to cite the case when offering a history of the subject and fewer still will have read it (the original was published in Latin). In this article, we argue that Sachs's case is the first convincing account of synaesthesia; we provide the first English translation of his description of it; we discuss the influence of the case in early theories about synaesthesia and its resonance with contemporary research findings.
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http://dx.doi.org/10.1080/09647040802431946 | DOI Listing |
Conscious Cogn
March 2025
Department of Psychology, University of Amsterdam, Nieuwe Achtergracht 129-B 1018 WT Amsterdam, the Netherlands.
In the past few decades, researchers have established synesthesia as a genuine phenomenon, identified its characteristics (in particular, its automatic, specific and consistent nature), and developed "gold standard" inclusion criteria for research: synesthetes are participants that self-report synesthetic experiences and have consistent (beyond a "cutoff" score) inducer-to-concurrent pairings. While this approach has significantly advanced scientific progress, it can confuse interpretation of research findings due to its inherent circularity: consistency will always appear to be a defining characteristic of synesthesia so long as it is also an inclusion criterion for synesthesia studies. Here, we aim to clarify the relationship between self-report and consistency in "diagnosing" synesthesia.
View Article and Find Full Text PDFFront Psychol
January 2025
Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.
Introduction: This study investigates the mechanisms underlying pitch class-color synesthesia, a cognitive trait in which musical pitches evoke color perceptions. Synesthesia in music particularly involves the association of pitch classes (e.g.
View Article and Find Full Text PDFFront Child Adolesc Psychiatry
November 2024
Faculty of Human Sciences, Sophia University, Chiyoda-ku, Tokyo, Japan.
Introduction: The (EMB) theory, a major causal hypothesis of autism (ASD: autism spectrum disorder), attributes excess androgens during early development as one of the causes. While studies have generally followed the EMB theory in females at birth, the co-occurrence of ASD in males at birth has been observed in conditions that are assumed to be associated with reduced androgen action during early development, including Klinefelter syndrome (KS) and sexual minorities. ASD is also associated with atypical sensory sensitivity, synesthesia, and savant syndrome.
View Article and Find Full Text PDFActa Psychol (Amst)
March 2025
Faculty of Psychology, University of Vienna, Vienna, Austria; Vienna Cognitive Science Hub, Vienna, Austria.
Colour plays an important role in the sighted world, not only by guiding and warning, but also by helping to make decisions, form opinions, and influence emotional landscape. While not everyone has direct access to this information, even people without colour vision (i.e.
View Article and Find Full Text PDFFront Psychiatry
December 2024
Faculty of Social and Behavioural Sciences, Leiden University, Leiden, Netherlands.
Background: Alice in Wonderland syndrome (AIWS) is a neurological condition characterized by perceptual distortions, most of which are visual in nature (metamorphopsias). Over the past decade there has been a movement in contemporary figurative painting away from strict mimesis toward depicting distortions of the painting's subject, called disrupted realism. In certain cases the similarities between the distortions in those paintings and those characteristic of AIWS are so striking that we suspect that artists may have experienced distorted perceptions themselves and used them for creative inspiration.
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