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Psych 2410 Feb 11 L5.docx

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School
Western University
Department
Psychology
Course
Psychology 2410A/B
Professor
Prof
Semester
Fall

Description
Psych 2410 Get notes missed first 1/2 hour Outline Last Time Perception - Preferential looking (standard, intermodal) - Habituation (looking time, sucking response time) - Visual acuity - Colour perception Intermodal perception - Visual tactile Motor - Obstacles to motor dev. - Early theories vs. DST - Stepping reflex VOE Violation of Expectation Paradigm - Compare responses to "expected" and "unexpected" events Ramp Study (Baillargeon, 1986) Q: do young infants not only understand object permanence but also represent properties of hidden objects like location? Method: habituation/ VOE, 6- ? months old At test -Possible/ "expected" event - box off tracks - Impossible/ "unexpected" event - Box on tracks Result: dishabituation for object permanence in 5 mo - Baillargeon (1987) - 3.5 +4.5 mo Conclusion: infants represent object permanence and location of object when hidden (feature binding) Why do infants make A-Not-B error? Observations (ways of lowering error) - Visual attention task (instead of manual search) - Make A and B distinct (2 covers with different patterns) - Decreasing the delay before the baby searches - Decrease the number of placements at A (stashed at A twice before it's switched to B, less babies will make error. At A 10 times then switched to B, babies will make more error) Decreasing delay before search: Explanation 1) Memory account Support: effect of delay (if you reduce memory demands you increase performance) Problem: if you use transparent covers or no covers, you will still get the A not B error. Piaget says "out of sigh, out of mind", but the thing is full in sight? They're making the error for other reasons, major challenge to Piaget's theory 2) Inhibition account: the parts of the brain (dorsal lateral prefrontal cortex- DLPC) that support inhibitory control are massively underdeveloped (in young kids, even in teenagers) - Monkeys get really good at a not b (get reward when they learn to look in the right place)- if you damage the DLPC they make the a not b error 3) Pedagogy account (slides in handout): social cues "misdirect" infant, take away social cues and they will correctly search
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