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Lecture 13

PSYCH 7A Lecture Notes - Lecture 12: Plantar Reflex, Palmar Grasp Reflex, Jean PiagetPremium

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PSYCH 7A - Lecture 13 - Development
Prenatal Development
3 Stages of prenatal development:
Germinal Period (First 7 10 days)
Embryonic Period (2nd week 8th week)
Fetal Period (9th week birth)
Germinal Period
Zygote an egg that has been fertilized by a sperm cell
Cells divide
Differentiation specialization in structure and function
After a week, the mass of cells (now called a blastocyst) consists of about 100 cells
Embryonic Period
Blastocyst attaches to the uterine wall, forming the placenta
The blastocyst inner cells become the embryo
Over this two month period:
all major organs begin to form
heart and liver begin to function
embryo grows to about an inch
Fetal Period
9 weeks embryo definitely looks human! It’s now called a fetus
6 months organs developed enough to give fetus a chance at survival
Fetus is responsive to sound
Newborn Reflexes
Newborns have very little control over their motor skills.
Reflexes help them get through first few months of helplessness
Grasp reflex
Babinski reflex
Rooting reflex
What Can Newborns Sense?
Prefer sights and sounds that promote social responsiveness:
Human voices
Images that resemble faces
Mother’s smell
Discriminate between different speech sounds (ba da)
Habituation responsiveness to a stimulus decreases due to repeated exposure
Cognitive Development
Jean Piaget
Schema - cognitive “framework” that represents and organizes information
Assimilation - interpreting one’s new experience in terms of one’s existing schemas
Accomodation - adapting one’s current schemas to incorporate new information
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