Developmental Psychology
The study of continuity and change across the life span
Zygote
fertilized egg that contains chromosomes from both a sperm and an egg
Germinal Stage
2-week period that begins at conception
Embryonic Stage
A period that lasts from the second week until about the eighth week
Fetal Stage
a period that lasts from the ninth week until birth
Myelination
the formation of a fatty sheath around the axons of a neuron
Teratogens
Agents that damage the process of development
Fetal Alcohol Syndrome
A developmental disorder that stems from heavy alcohol use by the mother during pregnancy
Infancy
the stage of development that begins at birth and lasts between 18 and 24 months
Motor Development
the emergence of the ability to execute physical actions
Reflexes
Speciific patterns of motor response that are triggered by specific patterns sensory stimulation
Cephalocaudal Rule
motor skills to emerge in sequence from the head to the feet
Proximodistal Rule
the tendency for motor skills to emerge in sequence from the center to the periphery
Cognitive Development
the emergence of the ability to think and understand
Sensorimotor Stage
a stage of development that begins at birth and lasts through infancy
Schemas
theories about ormodels of the way the world works
Assimilation
infants apply their schemas in novel situations
Accommodation
Occurs when infants revise their schemas in light of new information
Object Permanence
the idea that objects continue to exist even when they are not visible
Childhood
the stage of development that begins at about 18 to 24 months and lasts util adolescence, which begins between 11 and 14 years
Preoperational Stage
the stage of development that begins at about 2 year and ends at about 6 years
Concrete Operational Stage
the stage of development that begins at about 6 years and ends at about 11 years
Conservation
The notion that the quantitative properties of an object are invariant despite changes in the object’s appearance
Formal Operational Stage
The stage of development that begins around the age of 11 and lats through adulthood