Journal article

Evidence for increased internal noise in migraineurs for contrast and shape processing

Kathryn E Webster, J Edwin Dickinson, Josephine Battista, Allison M McKendrick, David R Badcock

Cephalalgia: an international journal of headache | SAGE PUBLICATIONS LTD | Published : 2012

Abstract

AIM: Increased contrast-level dependent internal noise has been reported in migraine. This study aimed to investigate whether a general increase in internal noise impacted on other tasks thought to assess functioning in cortical area V1 and was evident in global contour coding (V4). METHODS: Eleven migraineurs (six with aura) and 12 headache-free controls completed three psychophysical tasks: (i) contrast detection, (ii) discrimination of the angle of a spiral path and (iii) detection of deformation from circularity. Internal noise estimates were obtained using an N-pass method that compared responses to repeated presentations of identical stimuli. Internal noise results in inconsistent resp..

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