PSY100Y5 Lecture Notes - Lecture 2: Observational Error, Detection Theory, Absolute Threshold
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PSY100Y5 Full Course Notes
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Selection, organization and interpretation of sensory input. The study of how physical stimuli are translated into psychological experience. How the physical reality is changing how we perceive the world. Absolute threshold: detected 50% of the time. (red) Allows us to (cid:272)o(cid:373)pare differe(cid:374)t people"s data a(cid:374)d a real world. Had to redefi(cid:374)e fe(cid:272)h(cid:374)er"s threshold to a(cid:271)solute threshold (cid:271)e(cid:272)ause of experi(cid:373)e(cid:374)ts. The twice as much difference at the threshold. Signal detection theory: sensory processes + decision processes. Feature detection theory bottom up (trees, animals, plants, leaves = forest) Form perception top down (forest = trees & animals *only) Reversible figures and perceptual sets demonstrate that the same visual stimulus can result in very different perceptions. Discrepancy between visual appearance and physical reality. Dependent- probability of saying the line is larger and critical time (y) -130 to 180. Control variable- reference line (left) will always be 142 pixels.
