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Primary visual cortex excitability is not atypical in acquired synaesthesia

Primary visual cortex excitability is not atypical in acquired synaesthesia

Lungu, Laura, Ryan, Stewart, Luke, David P. ORCID: 0000-0003-2141-2453 and Terhune, Devin B. (2019) Primary visual cortex excitability is not atypical in acquired synaesthesia. Brain Stimulation, 13 (2). pp. 341-342. ISSN 1935-861X (doi:https://doi.org/10.1016/j.brs.2019.10.021)

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Abstract

A wealth of data suggests that psychedelic drugs elicit spontaneous perceptual states that resemble synaesthesia although it is unclear whether these different forms of synaesthesia share overlapping neural mechanisms. Multiple studies have shown that developmental and trained synaesthesia is characterized by selective hyperexcitability in primary visual cortex and it has been proposed that cortical hyperexcitability may contribute to induced and acquired synaesthesia. This study tested the prediction that a case of acquired synaesthesia (LW) would display selectively elevated primary visual cortex excitability, as reflected in lower transcranial magnetic stimulation (TMS) phosphene thresholds, but no difference in motor thresholds, relative to controls. In contrast to this prediction, LW’s phosphene threshold was well within the threshold range of controls. These results suggest that acquired synaesthesia is not characterized by atypical visual cortex excitability.

Item Type: Article
Uncontrolled Keywords: synaesthesia, primary visual cortex, psychedelic, transcranial magnetic stimulation
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Faculty / Department / Research Group: Faculty of Education, Health & Human Sciences
Faculty of Education, Health & Human Sciences > Department of Psychology, Social Work & Counselling
Last Modified: 31 Jan 2020 12:26
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/25987

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