The structure of inter-individual differences in visual ability: evidence from the general population and synaesthesia

Ward, Jamie, Rothen, Nicolas, Chang, Acer and Kanai, Ryota (2016) The structure of inter-individual differences in visual ability: evidence from the general population and synaesthesia. Vision Research, 141. pp. 293-302. ISSN 0042-6989

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This study considers how inter-individual differences in visual ability are structured. Visual ability could be a single entity (along the lines of general intelligence, or ‘g’), or could be structured according to major anatomical or physiological pathways (dorsal v. ventral streams; magno- v. parvo-cellular systems); or may be a finer-grained mosaic of abilities. To test this, we employed seven visual psychophysical tests (generating 16 measures) on a large (100+) sample of neurotypical participants. A Varimax-rotated PCA (Principal Component Analysis) revealed a two-factor solution that broadly corresponds to a high and low spatial frequency division (consistent with a magno/parvo distinction). Over and above this, two measures (temporal order judgments; gain in contrast sensitivity) correlated with most others, and loaded on both factors, suggesting that they tap broad visual processing demands. These analyses open up further possibilities for exploring the genetic and neuroscientific foundations of differences in visual ability. The tests were also run on a group of individuals with different types of visually-based synaesthesia, given that previous research have suggested they possess a distinct profile of visual abilities. Synaesthesia was linked to enhanced processing of colour and shape/curvature information (amongst others), that may relate to differences in V4 in this group. In conclusion, individual differences in vision are both striking and meaningful, despite our difficulty to imagine seeing the world any differently.

Item Type: Article
Keywords: Individual differences; Contrast sensitivity; Temporal order judgments; Synaesthesia/synesthesia; Visual ability; Shape; Colour/color
Schools and Departments: School of Psychology > Psychology
Subjects: Q Science > QZ Psychology
Depositing User: Jamie Ward
Date Deposited: 04 Jul 2016 12:05
Last Modified: 13 Dec 2017 10:47

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Project NameSussex Project NumberFunderFunder Ref
Enhanced Memory Ability: Insights from SynaesthesiaG1116ESRC-ECONOMIC & SOCIAL RESEARCH COUNCILES/K006215/1