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Retinotopic sensitisation to spatial scale: evidence for flexible spatial frequency processing in scene perception.
Emre Ozgen1, Helen E Payne, Paul T Sowden
1Department of Psychology, Bilkent University, Bilkent, Ankara 06800, Turkey. Eozgen@bilkent.edu.tr
Vision Research
|September 9, 2005
Summary
Visual perception flexibly uses spatial scale information. Early visual processing, modulated by attention, is responsible for spatial frequency (SF) sensitisation effects, influencing how we see SF content based on prior experience.
Area of Science:
- Visual perception
- Cognitive neuroscience
- Psychophysics
Background:
- Spatial scale information is crucial for visual perception.
- Attentional mechanisms are known to modulate sensory processing.
- Prior experience can influence current perception, a phenomenon known as sensitisation.
Purpose of the Study:
- To investigate if attentional modulation of early visual processing underlies spatial frequency (SF) sensitisation.
- To determine if prior exposure to specific SF content at a location affects subsequent perception of SF in band-limited stimuli.
Main Methods:
- Three experiments were conducted using band-limited scene stimuli.
- Participants were exposed to images with specific SF content at various locations during a sensitisation phase.
- Perceptual judgments of SF in test stimuli were recorded.
Main Results:
- Perception of SF in band-limited stimuli was significantly influenced by the SF content of previously viewed images at the same location.
- Sensitisation effects were observed, demonstrating a link between prior experience and current visual perception.
Conclusions:
- Findings support the involvement of early, retinotopically mapped visual processing stages.
- Results are consistent with attentional modulation of specific spatial frequency channels as the mechanism for sensitisation effects.