PSYCH 2220 Perception Lecture 11. Do we need to LEARN to see?

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Presentation transcript:

PSYCH 2220 Perception Lecture 11

Do we need to LEARN to see?

KEYWORDS for lecture 9 "do we need to learn to see?", empiricists (yes), nativists (no), innate visual behaviours, dung beetle, chimpanzees and snakes, ducklings and hawks, Molyneux's question ("if a man is given his sight as an adult, could he distinguish a sphere and a cube?"), two patients described, babies, mixed up faces, visual cliff, contrast sensitive function for infants, preferential looking, adaptation (remember that Dalmatian!), inverting prisms, hens show no adaptation, horizontal or vertical rearing

EMPIRICIST (all knowledge comes from experience) NATIVIST (knowledge is ‘a priori’; you are born with it)

1 animal behaviour

Molyneux’s question: “could a man born blind distinguish a sphere and a cube by sight alone?” 2 blind people recovering sight

S.B could see with minimal experience

H.D. never could see very well.

3 child development, Fant’z Experiment

4 adaptation

5 controlled rearing

Animal behavour Blind people recovering their sight Babies’ visual development Adaptation experiments Controlled rearing experiments EVIDENCE ……………………. Nativist … Empiricist & nativist …………. Empiricist & nativist …………… Empiricist ……….. Empiricist

INTRODUCTION TO HEARING

* * * All points on this curve have the same perceived loudness as the standard (*) EQUAL LOUDNESS CURVES

Place theory 1 - Travelling wave; stiffness varies 2 - one place most active for a given frequency 3 - tonotopic code; coded as place Periodicity theory 1 - sound coded as pattern

Hearing thresholds Equal loudness Masking The case of the missing fundamental harmonics pitch timbre

Training a goldfish...

Evidence against place -- Missing fundamental -- which can be masked -- some animals have no basilar membrane Evidence against periodicity -- cells can’t fire fast enough -- diplacusis Evidence for place -- physiology Evidence for periodicity -- multiple cells could do it -- phase locking of cells

Place theory sound coded as place Periodicity theory sound coded as pattern Duplicity below 1kHz, coded by periodicity above 1 kHz, coded by place

Auditory localization 1 inter-aural time of arrival differences -- circle of confusion 2 inter-aural intensity differences 3 pinnae (up/down front/back etc..) 4 head movements

Auditory cortex Auditory thalamus Superior colliculus Inferior colliculus cochlea Cochlear nucleus Superior olive The Auditory System

The Auditory System (cortical route) Cochlear nucleus Inferior colliculus thalamus cortex

The Auditory System (sub-cortical route) Cochlear nucleus Superior olive Inferior colliculus Superior colliculus

The Auditory System

The Superior Colliculus

LOCALIZATION OF FUNCTION IN THE CORTEX

Phrenology

Stimulation recording lesions anatomy

Phineas Gage

THE CORPUS CALLOSUM

“SPLIT BRAIN”

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