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1 Infant Development, Fall 2010 Chapter 5 Sensation, Perception, and Motor Development October 19 and October 21, 2010 Reflexes Newborn Reflexes • Newborns have well-developed reflexes and sensory responses for adapting to their environments – Some reflexes are permanent, whereas others disappear – Abnormalities in reflexes can help identify neurological problems that may be useful in predicting future deficits Reflexes with Adaptive Value ____________________: Infants turn their head to the side when their cheek is stimulated ____________________: Infants readily suck on items that are placed in their mouths Reflexes Without Any Adaptive Value ____________________: Infants’ toes fan out when their foot is stroked ____________________: The fencer position that is adopted while laying down or sleeping ____________________: Infants seem to walk when their feet are placed on a hard surface Example of the Tonic Neck Reflex Siegler, DeLoache, & Eisenberg (2003)
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2 Reflexes and the Brain • Abnormal presence or absence of reflexes may provide information about brain development • Certain reflexes may be present at certain times and then disappear • The strength of the reflexive reaction can also be used to determine brain damage Example: The Stepping Reflex • Example of the stepping reflex • Apparent before ______________ of age and then disappears • Re-emerges later in development as walking • Known as a U-shaped developmental function U-Shaped Function: Stepping Stepping Behavior Age _______________ ________________ ________________ Reflexes and Brain Development • Primarily thought that shift from subcortical to cortical functioning was responsible for the disappearance of the stepping reflex • If brain development is responsible, however, all infants should to go through the process around same time • If variability exists, cannot be influenced only by
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This note was uploaded on 11/28/2010 for the course PSYCH PSYCH 110D taught by Professor Angelaluwoski during the Winter '10 term at UC Irvine.

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