title: Amplitude difference and similar time course of impulse responses in positive- and negative-contrast detection.
abstract: Temporal impulse response functions (IRFs) were measured to investigate the temporal characteristics of positive- and negative-contrast detection in human vision. The IRFs were estimated using models from sequential double-pulse thresholds measured by the psi method. The results indicated that thresholds for positive contrast detection were significantly higher than those for negative contrast detection. However, positive- and negative-contrast IRFs were similar except for the first peak amplitude, reflecting the difference in sensitivity that originates from the summation operation rather than the linear filtering of the visual system.
authors.affiliation: Department of Engineering, Graduate School of Engineering, Kochi University of Technology, Japan. shilin.sl@gmail.com
authors.forename: Lin
authors.initials: L
authors.lastname: Shi
authors.forename: Keizo
authors.initials: K
authors.lastname: Shinomori
mesh_terms: D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D010775:Photic Stimulation / Q000379:methods; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology; D012684:Sensory Thresholds / Q000502:physiology; D055815:Young Adult