6_reflexes - Reflexes Reflexes What is a reflex? How would...

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1 1 Refexes • Refexes –What is a refex? How would you diFFerentiate it From other types oF movements? • Traditional de±nition: –Simple, highly stereotyped, unlearned • Do refexes develop? –Piaget (yes); Pavlov (no) • Development oF refexive movement –Start out gross, diFFuse, widespread –Become more speci±c with time 2 • Example: trigeminal “jaw jerk” refex oF guinea pig –Earlier: whole head moves –Weeks later: only jaw moves • Example: eyeblink refex in humans –Present in inFants, adults –No ontogenetic changes in Form Refexes 3 • Systemogenesis: system-speci±c development –Example: grasping refex in human inFant –All parts oF system mature as a unit • Sensory tissue in palm • motor neurons in Forearm • arborization For hand in somatosensory cortex • An ontogenetic adaptation? • ²unction maturity Developmental gradients
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2 4 Piaget: Sensorimotor substages Birth - 2 years Development of: Coordination between sensory input and motor behavior Voluntary control Problem-solving behavior Symbolic representation 5 Piaget: dynamics of development • Schema: a psychological unit of action – Used as building blocks for more complex behavior
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This note was uploaded on 09/19/2009 for the course PSYCH 2090 taught by Professor Goldstein, m during the Spring '07 term at Cornell University (Engineering School).

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6_reflexes - Reflexes Reflexes What is a reflex? How would...

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