Data from: A tilt after-effect for images of buildings: evidence of selectivity for the orientation of everyday scenes

Hussain Ismail, Ahamed Miflah, Queen Mary University of London

Solomon, Joshua A., University of London

Hansard, Miles, Queen Mary University of London

Mareschal, Isabelle, Queen Mary University of London

Published Oct 26, 2016 on Dryad. https://doi.org/10.5061/dryad.6pv38

Cite this dataset

Hussain Ismail, Ahamed Miflah; Solomon, Joshua A.; Hansard, Miles; Mareschal, Isabelle (2016). Data from: A tilt after-effect for images of buildings: evidence of selectivity for the orientation of everyday scenes [Dataset]. Dryad. https://doi.org/10.5061/dryad.6pv38

Abstract

The tilt after-effect (TAE) is thought to be a manifestation of gain control in mechanisms selective for spatial orientation in visual stimuli. It has been demonstrated with luminance-defined stripes, contrast-defined stripes, orientation-defined stripes and even with natural images. Of course, all images can be decomposed into a sum of stripes, so it should not be surprising to find a TAE when adapting and test images contain stripes that differ by 15° or so. We show this latter condition is not necessary for the TAE with natural images: adaptation to slightly tilted and vertically filtered houses produced a ‘repulsive’ bias in the perceived orientation of horizontally filtered houses. These results suggest gain control in mechanisms selective for spatial orientation in natural images.

Usage notes

Ismail et al(2016)-PROS

Raw Data files have been organized by unique initials of each observer who participated in the study (eg., 'AM'). Some observers participated in more than one test condition. Each Excel file corresponds to one unique observer. Each work-sheet within an Excel file corresponds to data from one test condition (eg., 'same house'). Within each work-sheet data for all 3 test blocks (baseline, CW adaptor and CCW adaptor) are given. For a given test block: Column 1: trial number Column 2: tilt of the 'pedestal' test stimulus (in degrees) Column 3: tilt of the 'comparison' test stimulus (in degrees) Column 4: spatial position of the 'pedestal' test (1 - left of fixation, 2 - right of fixation) Column 5: observer's response (97 - if the test stimulus to the left of fixation was chosen as appearing more upright or 98 - if the test stimulus to the right of fixation was chosen as appearing more upright) Note: For tilts of the 'pedestal' and 'comparison' test stimuli, positive tilts represent CCW rotations in the fronto-parallel plane and negative tilts represent CW rotations in the fronto-parallel plane.