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Lecture 8

PSYC1003 Lecture 8: psyc8

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Dr.Harald Taukulis

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Perceptual consistencies: stable perception amid changing stimuli Optical illusions: discrepancies between visual appearance and physical reality  Muller-Lyer illusion: two lines the same length with arrows pointing different ways at the end- one looks longer than the other  Ponzo illusion: judging an object’s size based on its background  Poggendorf illusion: connecting two lines between a rectangle  The Ames Room: room where one person looks huge and the other tiny; both are same  Impossible figures: cannot exist in reality The Auditory system: Stimulus: sound waves Amplitude: loudness- sound pressure measured in decibels (db)- db increase= louder Wavelength: pitch- measured in circles per second (Hz)- frequency increase= pitch increase Purity: timbre Absolute threshold: function of both sound pressure and frequency (about 2000Hz) Sensory adaptation: adaptive significance (getting used to sounds in familiar environment) helps us identify strange sounds Outer ear: pinna Middle ear: ear drum, ossicle
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