38th European Conference on Visual Perception (ECVP) 2015 Liverpool

Pilling, M. and Guest, D. ORCID: 0000-0003-4514-9186, 2015. 38th European Conference on Visual Perception (ECVP) 2015 Liverpool. Perception, 44 (S1), p. 323. ISSN 0301-0066

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Abstract

In Object Substitution Masking (OSM) a mask surrounding, simultaneously onsetting with, and trailing a target leads to a reduction in target perceptibility (Di Lollo et al., 2000). It has been questioned whether this process is due to target substitution or the addition of noise to the percept (Pödor, 2012). Two experiments examined this issue using an adjustment task in which a test Landolt C is presented and participants rotate it to match the target Landolt C shown during the trial (typical OSM paradigms use 2-4 alternative forced choice); the dependent measure was the angle of error. In Experiment 1 the effect of a trailing OSM mask (80ms-320ms) is compared against that of adding stimulus noise of varying densities (25%-75%) to the target location. Both manipulations (OSM, stimulus noise) produced a similar change in the distribution of errors compared against a baseline (0ms trailing mask, 0%-noise). The pattern is consistent with both mask manipulations reducing the fidelity of the target percept. In Experiment 2 the OSM and stimulus noise manipulations were varied factorially. Here the two manipulations had combinatorial effects on the error distribution. Implications are discussed regarding the mechanisms of OSM and the consequences of OSM for target perception

Item Type: Journal article
Description: Paper presented at the 38th European Conference on Visual Perception (ECVP), Liverpool, 2015
Publication Title: Perception
Creators: Pilling, M. and Guest, D.
Publisher: Sage
Date: 2015
Volume: 44
Number: S1
ISSN: 0301-0066
Divisions: Schools > School of Social Sciences
Depositing User: Linda Sullivan
Date Added: 23 Feb 2016 15:01
Last Modified: 09 Jun 2017 13:59
URI: http://irep.ntu.ac.uk/id/eprint/27020

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