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Timing of contextual modulation in the shine-through effect.
Michael H Herzog1, Ulrike Schmonsees, Manfred Fahle
1Human Neurobiology, Center for Advanced Imaging, University of Bremen, Argonnenstr. 3, D-28211, Bremen, Germany. michael.herzog@uni-bremen.de
Vision Research
|July 5, 2003
Summary
The shine-through effect reveals how context modulates visual perception. Even brief contextual elements, presented 100ms prior, can suppress target visibility when combined with a grating, demonstrating rapid temporal masking.
Area of Science:
- Visual perception
- Human visual system
- Psychophysics
Background:
- Contextual elements significantly influence target perception.
- The shine-through effect, a visual masking phenomenon, offers insights into contextual modulation.
- Previous research primarily explored spatial aspects of this effect.
Purpose of the Study:
- To investigate the temporal dynamics of contextual modulation in the human visual system.
- To understand the time course of the shine-through effect and contextual suppression.
Main Methods:
- Utilized a shine-through paradigm involving a vernier target preceding a grating.
- Manipulated display durations (as short as 10 ms) and temporal onset of contextual elements.
- Assessed visibility changes of the vernier target under varying contextual conditions.
Main Results:
- Contextual suppression of the shine-through element was observed with context durations as brief as 5-10 ms.
- Suppression occurred even when contextual elements appeared 100 ms before the target.
- Contextual elements alone had minimal masking power; suppression required their combination with the grating.
Conclusions:
- The human visual system exhibits rapid temporal processing of contextual information.
- Contextual suppression in the shine-through effect is a time-dependent phenomenon.
- The interaction between contextual elements and the grating is crucial for significant visual masking.