Lec 3 psychophysics and direct perception

Lec 3 psychophysics and direct perception - Paper:...

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Complete Nature/Nurture discussion Attachment versus Temperament Critical/sensitive period and gene expression Psychophysics Unconscious inference in perception Direct perception
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Weber’s Law ΔI / I = k (I = intensity of stimulus measured physically, k = a constant) • In English: the change in intensity that we can just barely notice is a fix percentage change • JND’s: Just noticeable differences • k for light intensity: 1/60; lifted weights:
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Fechner’s Law S = k log I or in English: the magnitude of a sensation is logarithmically related to physical intensity.
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Stevens Law S = kIb Or in English, Sensation is a power function of physical intensity
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Unformatted text preview: Paper: "To Honor Fechner and Repeal His Law." Point: Sensory magnitude grows with physical intensity raised to some power (.3 power for brightness; 3.5 for electric shock) Depth Information Monocular Depth Cues Perspective Size Occlusion Shadows Motion paralax Color saturation Bioncular Depth Cues Convergence Retinal disparity J. J. Gibson and Direct Perception Evolutionary argument about perceptual systems Methodological argument about concentrating on correct perception not illusions Texture gradients as an example...
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Lec 3 psychophysics and direct perception - Paper:...

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