The dynamics of texture segregation : a task comparison approach

• Main Author: Arsenault, Serge A.
• Other Authors: Wilkinson, Frances (advisor)
• Format: Others
• Language: en
• Published: McGill University 1993
• Subjects: Visual texture recognition.; Visual discrimination.
• Online Access: http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69546

The time course of texture segregation was studied for three different measures of segregation (detection, localization and identification of an embedded texture region) under three different raster width conditions (26$ sp prime$, 43$ sp prime$ and 61$ sp prime$ of arc) by using a backward masking paradigm. The masking data were described with an exponential model the parameters of which represent rate of performance improvement and asymptotic performance level. The results indicate that: (1) information supporting localization accrues more rapidly than information supporting identification, (2) increasing element spacing had a more detrimental effect on identification than on localization, (3) under most spacing conditions, performance on detection fell between that for localization and identification. In conclusion, these three widely used texture segregation tasks cannot be considered equivalent measures of a single process. However, comparisons among their respective time courses may enable us to better characterize the mechanisms underlying the segregation process.