Size scaling compensates for sensitivity loss produced by a simulated central scotoma in a shape-from-texture task.

Abstract:

:Studies of eccentricity-dependent sensitivity loss typically require participants to maintain fixation while making judgments about stimuli presented at a range of sizes and eccentricities. However, training participants to fixate can prove difficult, and as stimulus size increases, they become poorly localized and may even encroach on the fovea. In the present experiment, we controlled eccentricity of stimulus presentation using a simulated central scotoma of variable size. Participants were asked to perform a 27-alternative forced-choice shape-from-texture task in the presence of a simulated scotoma, with stimulus size and scotoma radius as the independent variables. The resulting psychometric functions for each simulated scotoma were shifted versions of each other on a log size axis. Therefore, stimulus magnification was sufficient to equate sensitivity to shape from texture for all scotoma radii. Increasing scotoma radius also disrupts eye movements, producing increases in fixation frequency and duration, as well as saccade length.

journal_name

J Vis

journal_title

Journal of vision

authors

Johnson A,Gurnsey R

doi

10.1167/10.12.18

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

18

issue

12

issn

1534-7362

pii

10.12.18

journal_volume

10

pub_type

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