Human Perception 7: Pattern Sensitivity.

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Presentation transcript:

Human Perception 7: Pattern Sensitivity

Harmonic Spatial Stimuli M = mean level, a = contrast, f = spatial frequency

Receptive Field MTF

Harmonic Spatial-Temporal Stimuli c(x,t) = M ( 1 + a sin(2fxx) sin(2ftt) ) M = mean level, a = contrast, fx = spatial frequency, ft = temporal frequency

Human Contrast-Sensitivity Function

Human Contrast-Sensitivity Function

Psychophysical Linespread Function

Light Adaptation

Light Adaptation (A) 2 degree disk (de Lange 1958) (B) 60 degree disk (Kelly 1961)

Retinal Eccentricity (A) 1 degree x 2 degree grating patch (B) Scaled in size and frequency

Retinotopic organization Methods to estimate the receptive field location

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