Haigh, SM and Barningham, L and Berntsen, M and Coutts, LV and Hobbs, EST and Irabor, J and Lever, EM and Tang, P and Wilkins, AJ (2013) 'Discomfort and the cortical haemodynamic response to coloured gratings.' Vision Research, 89. 47 - 53. ISSN 0042-6989

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Abstract

In five experiments we measured the amplitude of the haemodynamic response to visual patterns using near infrared spectroscopy of the visual cortex. The patterns were gratings with bars that differed in chromaticity but not in luminance. In all experiments, with a wide range of chromaticities of the grating bars, the amplitude of the haemodynamic response increased with the separation of the chromaticities in the CIE 1976 UCS diagram. The amplitude did not vary consistently with the cone activation, or with the signal in colour difference channels. In four further experiments, again with a wide range of chromaticities, the gratings were rated for visual comfort. Discomfort increased consistently with the separation of the chromaticities. Given that a large haemodynamic response to patterns is generally associated with headache, we suggest that the discomfort may be a homeostatic signal to reduce sustained metabolic load on the visual cortex. © 2013.

Item Type:	Article
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Divisions:	Faculty of Science and Health > Psychology, Department of
Depositing User:	Users 161 not found.
Date Deposited:	12 May 2014 14:12
Last Modified:	30 Jan 2019 16:18
URI:	http://repository.essex.ac.uk/id/eprint/9393

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