Temporal tuning characteristics of the perceptual template and endogenous cuing of spatial attention.
External noise presented in temporal contiguity with a target impairs perceptual performance, reflecting the temporal tuning of the perceptual template. Deriving the temporal characteristics of the perceptual template, however, requires an observer model that segregates the impact of non-linearities and intrinsic inefficiencies of the observer in order to account for the impact of external noise in various temporal configurations. In Experiment 1, we showed that the perceptual template model successfully accounts for temporal masking functions in foveal Gabor orientation identification masked by external noise with a wide range of temporal configurations, and estimates the temporal characteristics of the perceptual template. In Experiment 2, we extended the paradigm and the model to compare the temporal tuning characteristics of the perceptual template in central pre- and simultaneous cuing of endogenous spatial attention in a Gabor orientation identification task in visual periphery. We found that endogenous spatial attention excludes external noise by both sharpening the temporal window of the perceptual template and (mostly) reducing the impact of external noise uniformly across the entire temporal window.
Lu
Zhong-Lin
ZL
Laboratory of Brain Processes (LOBES), Department of Psychology, and Neuroscience Graduate Program, University of Southern California, Los Angeles, CA 90089-1061, USA. zhonglin@usc.edu
Jeon
Seong-Taek
ST
Dosher
Barbara Anne
BA
D001288:Attention / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology; D003463:Cues; D005584:Fovea Centralis / Q000502:physiology; D006801:Humans; D008960:Models, Psychological; D009949:Orientation / Q000502:physiology; D010470:Perceptual Masking / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology*