Effects of spatial cuing on luminance detectability: psychophysical and electrophysiological evidence for early selection.
Three experiments were conducted to determine whether attention-related changes in luminance detectability reflect a modulation of early sensory processing. Experiments 1 and 2 used peripheral cues to direct attention and found substantial effects of cue validity on target detectability; these effects were consistent with a sensory-level locus of selection but not with certain memory- or decision-level mechanisms. In Experiment 3, event-related brain potentials were recorded in a similar paradigm using central cues, and attention was found to produce changes in sensory-evoked brain activity beginning within the 1st 100 ms of stimulus processing. These changes included both an enhancement of sensory responses to attended stimuli and a suppression of sensory responses to unattended stimuli; the enhancement and suppression effects were isolated to different neural responses, indicating that they may arise from independent attentional mechanisms.
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- Visual Perception
- Spatial Behavior
- Space Perception
- Perceptual Masking
- Humans
- Experimental Psychology
- Electroencephalography
- Discrimination Learning
- Choice Behavior
- Brain
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Visual Perception
- Spatial Behavior
- Space Perception
- Perceptual Masking
- Humans
- Experimental Psychology
- Electroencephalography
- Discrimination Learning
- Choice Behavior
- Brain