Lec 3 psychophysics and direct perception

Lec 3 psychophysics and direct perception - • •...

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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 - • •...

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