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A close, emotional bond of affection between infants and their caregivers.


The tendency to focus on just one feature of a problem, neglecting other important aspects.


The head-to-foot direction of motor development.

Cognitive Development

Transitions in youngsters' patterns of thinking, including reasoning, remembering, and problem solving.


Piaget's term for the awareness that physical quantities remain constant in spite of changes in their shape or appearance


An abnormal condition marketed by multiple cognitive defects that include memory impairment.


A limited ability to share another person's viewpoint.

Embryonic Stage

The second stage of prenatal development, lasting from two weeks until the end of the second month.

Fetal Alcohol Syndrome

A collection of inborn problems associated with excessive alcohol use during pregnancy.

Fetal Stage

The third stage of prenatal development, lasting from two months through birth.

Gender Differences

Actual disparities between the sexes in typical behavior or average ability.

Germinal Stage

The first phase of prenatal development, encompassing the first two weeks after conceptions.


The first occurrence of menstruation.

Midlife Crisis

A difficult, turbulent period of doubts and reappraisal of one's life.

Moral Development

Measure nature and progression of moral reasoning.

Object Permanence

Recognizing that objects continue to exist even when they are no longer visible.

Prenatal Period

The period from conception to birth, usually encompassing nine months of pregnancy.

Primary Sex Characteristics

The sexual structures necessary for reproduction.

Proximodistal Trend

The center-outward direction of motor development.


The period of early adolescence marked by rapid physical growth and the development of sexual maturity.

Secondary Sex Characteristic

Physical features that are associated with gender but that are not directly involved in reproduction.

Separation Anxiety

Emotional distress seen in many infants when they are separated from people with who they have formed an attachment.


The first occurrence of ejaculation.

Strange Situation

Secure, Anxious-ambivalent, and Avoidant.


A one-celled organism formed by the union of a sperm and an egg.


Developed a research paradigm to study attachment using separation anxiety as a measure.


Believed interaction with the environment and maturation gradually alter the way children think


Rhesus Monkey.


Devised a stage theory of moral development based on subjects' responses to presented moral dilemma

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