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Lecture 3 - Announcement Foundations of Mind 200.336"There...

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1 Foundations of Mind 200.336 2/7/2012 Lecture #3 Depth Perception 2 2 "There is a student in this class who requires the services of a note taker. This is a paid position through the Student Disability Services Office. If you are interested in performing this service, please send an e-mail to [email protected] The note taking accommodation is to supplement the personal notes of the registered student. It is not intended to substitute the student's own notes, attendance, or class participation.” Announcement 3 Signatures of Depth Percep5on in Infants? 1 addi5onal control: Repeat the stereo preference experiment without the glasses (both images seen by both eyes-­‐-­‐no stereo) vs. No preference for double images in the no-­‐stereo condi5on. Argues against Berkeley “simply confused” worry Real stereo Double images 4 Signatures of Depth Percep5on in Infants? Stereopsis: conclusions 3-­‐4 month old infants show all the key psychophysical signatures of stereopsis in adults. The signatures emerge abruptly. The signatures of stereopsis emerge before reaching , sugges5ng that they aren’t learned by associa5on with touch (a la Berkeley) (though visual experience may influence their development). Humans may be predisposed to perceive depth from binocular disparity. (a la Descartes)
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2 5 Two Approaches to Solving the Problem 1) Psychophysical signatures of depth percep5on in infants 2) Equivalence of different cues to depth Mul5ple Cues to Depth Linear perspective Interposition (occlusion) 6 Mul5ple Cues to Depth Optical expansion (a motion cue) 7 8 We must learn to associate the sensa5ons of each of these cues to the tac5le experience of depth! The mind automa5cally treats all of these as signifying info about the same thing in the world: Depth! The Equivalence of Depth Cues
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3 9 The Equivalence of Depth Cues Mo5on (accre5on/dele5on) Stereo The same depth arrangement can be specified by different cues (Yonas studies) 10 The Equivalence of Depth Cues How should young infants perceive the two arrangements? The same depth arrangement can be specified by different cues (Yonas studies) Mo5on (accre5on/dele5on) Stereo Perceive as DIFFERENT! Perceive as the SAME! Problem: How can we test if infants see these as the “same”?? 11 The Equivalence of Depth Cues Method #1: Looking Time Method #2: Preferen5al Looking Method #3: Habitua5on For example… 12 Method: Visual habitua5on procedure Seconds Developmental Method #3: Habitua5on
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4 13 Method: Visual habitua5on procedure Seconds Developmental Method #3: Habitua5on 14 Developmental Method #3: Habitua5on Method: Visual habitua5on procedure Seconds 15 Developmental Method #3: Habitua5on Method: Visual habitua5on procedure Seconds Habitua5on curve 16 Developmental Method #3: Habitua5on Method: Visual habitua5on procedure Ho hum… Seconds Habitua5on curve
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5 17 Developmental Method #3: Habitua5on Method: Visual habitua5on procedure Wow!!!
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