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Persons woho are 12 to 18 years of age.

Anxious-avoidant Attachment

A bond between an infant and his/her parent or caregiver in which the infant is repeatedly rejected and develops an isolated lifestyle that does not depend on the support and care of others.


A disorder in which cholesterol and calcium build up inside the walls of the blood vessels, forming plaque, which eventually leads to partial or complete blockage of blood flow.


Injury resulting from pressure disequilibrium across body surfaces, for example too much pressure in the lungs.


The formation of a close, personal relationship.

Conventional Reasoning

A type of reasoning in which a child looks for approval from peers and society.

Early Adults

Persons who are 19 to 40 years of age.


Areas where the infant's skull has not fused together; usually disappear at approximately 18 months of age.


Persons who are from 1 month to 1 year of age.

Late Adults

Persons who are 61 years old or older.

Life Expectancy

The average amount of years a person can be expected to live.

Middle Adults

Persons who are 41 to 60 years of age.

Moro Reflex

An infant reflex in which, when an infant is caught off guard, the infant opens his/her arms wide, spreads the fingers, and seems to grab at things.


Persons who are birth to 1 month of age.


The basic filtering units in the kidneys.

Palmar Grasp

An infant reflex that occurs when something is placed in the infant's palm;the infant grasps the object.

Postconventional Reasoning

A type of reasoning in which a child bases decisions on his/her conscience.

Preconventional Reasoning

A type of reasoning in which a child acts almost purely to avoid punishment to get what he/she wants.


Persons who are 3 to 6 years of age.

Rooting Reflex

An infant reflex that occurs when something touches an infant's cheek, and the infant instinctively turns his/her head toward the cheek.

School Age

A person who is 6 to 12 years of age.

Secure Attachment

A bond between an infant and his/her parent or caregiver, in which the infant understands that his/her parents or caregivers will be responsive to his/her needs and take care of him/her when he/she needs help.

Sucking Reflex

An infant reflex in which the infant starts sucking when his/her lips are stroked.

Terminal Drop Hypothesis

The theory that a person's mental function declines in the last 5 years of life.


Persons who are 1 to 3 years of age.

Trust and Mistrust

A phrase that refers to a stage of development from birth to approximately 18 months of age, during which infants gain trust to their parents or caregivers if their world is planned, organized, and routine.

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