Module 14/16 (Lifespan development) Flashcards
Zygote
from conception until ~2 weeks
Stages of prenatal development
zygote, embryo, fetus
Embryo
when zygote attaches to the uterus; zygote’s inner cells become the embryo, the outer cells become placenta (weeks 2-8)
Fetus
now recognizably human, in the next 6 weeks, body organs begin to form and function. By week 9, fetus is recognizably human (week 9-40/birth)
Teratogens
any environmental agent, such as a virus or chemical (e.g. lead, mercury, alcohol, etc.) that can reach the embryo/fetus during prenatal development and cause harm
(Alcohol, nicotine, marijuana)
Effects of recreational drugs in prenatal development
Recreational drugs can interfere with brain development, they may also have epigenetic effects (making some genes more/less active)
FAS (fetal alcohol syndrome)
associated with birth defects, later struggles with attention, memory, intelligence, behavior regulation, and an increased preference for alcohol themselves
The womb
our first immersive classroom, influences taste preferences, auditory/language learning, and brain development
Taste preferences from womb
Mother’s food choices (while pregnant/lactating) affect babies’ later preferences
Auditory/language learning in womb
-Newborns prefer vowel sounds of mother’s language
-Brain activity at birth → evidence of word recognition
-Infant crying follows intonation of mother’s language
Effect of extreme stress/malnourishment in womb
May calibrate brain development and trigger epigenetic effects that affect the child throughout development and across the lifespan
Brain development
-The human central nervous system begins to form when the embryo is approximately two weeks old
-At birth, 80+ billion neurons
-At birth, brain weighs ~350 grams
-By end of year, brain weighs ~1000 grams
-Adult brain weighs ~1200 grams
Synaptic pruning
-The “use it or lose it” elimination synapses during development
-enhances neural efficiency, by helping to finetune tissue and performance
-Synaptic pruning occurs at different times in different areas of the brain and at different times during development, and is not completed until adolescence
Piaget’s theory of cognitive development
Sensorimotor, Preoperational, Concrete operational, and Formal operational
Sensorimotor (Piaget)
-birth to ~2 years, experiencing the world through senses and actions (looking, hearing, touching, mouthing, grasping)
-Key milestones: object permanence, stranger anxiety