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Lecture 5

Lecture 5 Notes

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PSYC 1010
Gerry Goldberg

Lecture 5 Notes Sensation and Perception Perception:The selection, organization, and interpretation of sensory input. Perception Is Active Psychophysics: - Thresholds: o Defined in terms of probability of responding  Absolute Threshold: the intensity level at which the probability of detection is 50%. “Truly” absolute threshold incorporates a probability of detecting a stimulus at threshold intensity would jump from 0% to 100% immediately. o JND (Weber’s Law) o Psychophysical Scaling (Fechner’s Law): if you open a sixty watt light in a pitch black room. And then if you turn on a second 60 watt light, the difference is minimal. But when you put the third 60-watt light, the difference is even more minimal. Constant increments in the alteration of something produce minimal sensory recognitions. REVIEW FECHNER’S LAW - Signal Detection Theory: The four outcomes that is possible in attempting to detect the presence of weak signals: Perception without Awareness - Subliminal Perception Sensory Adaptation: - Noise from ventilation, become unnoticeable because we adapt to it. - Visual System Stimulus: Light (Amplitude and wavelength) visible spectrum and neural impulses. We don’t see everything exactly the way it is. We actively reconstruct what we see. For example, the images in the back of our eye is up-side-down however, our brain flips the image to show the normal image. Saccades: Our eye is ALWAYS moving minimally to prevent images from fading away (like the adaptation we have to wearing a hat) Visual Pathways: Retina to optic disk/optic nerve/ optic chiasm to two divergent pathways `Two pathways: - To the superior colliculus (I midbrain involves coordination with other sensory input). - (main pathway) to the thalamus to lateral geniculate nucleus (LGN( in occipital lobe to primary visual cortex secondary visual cortex to temporal and parietal lobes. (Lots of higher order processing). Dorsal Stream (The Where) Ventral Stream (The What) Information processing in the visual cortex: - Simple cells - Complex cells - Feature detectors - Face detectors (“Evolutionary forces”) Features then seem to get “assembled” Colour Stimulus: Wavelength  hue Amplitude  brightness Purity  saturation - Subtractive colour mixing: a bright yellow ball bucket
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