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Updated Feb 17, 2026

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2 pages

Exploring Key Concepts in Developmental Psychology

@mowers_mbbh

Psychology's developmental unit explores how humans change physically, cognitively, and... Show more

Psychology
Unit 7: Development
Vocabulary

1. Developmental psychology the scientific study of how humans change over the life
span, from co

Developmental Psychology Foundations

Ever wonder how you grew from a tiny embryo into the person you are today? Developmental psychology studies these changes from conception to death, tracking our journey through predictable stages.

Your life began in the germinal period (conception to 2 weeks) when you were just a rapidly dividing zygote implanting into the uterine wall. The embryonic period $2-8 weeks$ followed, where your brain, spine, and major organs began forming. During the fetal period (8 weeks until birth), your brain continued developing while your body refined its structures and gained weight.

Environmental dangers called teratogens can harm prenatal development, which is why pregnant women avoid certain substances. After birth, infants develop different attachment styles with caregivers: secure attachment (confident exploration with caregiver present), avoidant attachment (little interest in caregiver), or ambivalent attachment (mixed feelings about caregiver).

Think About It: The way you bonded with your parents as a baby might influence your relationships today. Most infants (about 65%) develop secure attachments, giving them confidence to explore their world.

According to Piaget's theory, children's thinking develops through distinct stages. In the sensorimotor stage (birth to 2 years), babies learn through senses and movement. During the preoperational stage $2-7 years$ , children think symbolically but lack logical reasoning. The concrete operational stage $7-11 years$ brings logical thinking about tangible objects and experiences.

Cognitive and Social Development

Remember how differently you thought as a child compared to now? In Piaget's final stage, the formal operational stage $age 11+$ , you gained the ability to think abstractly and test hypotheses through logic - skills that help you succeed in higher-level classes.

Our social development follows predictable patterns too. During adolescence, Erikson identified the challenge of identity vs. role confusion, when teens ask "Who am I?" Young adults face intimacy versus isolation, seeking meaningful relationships. Middle-aged adults encounter generosity versus stagnation, focusing on leaving a positive legacy, while older adults confront integrity vs. despair as they reflect on their life's meaning.

Our moral reasoning also evolves through levels. The preconventional level focuses on self-interest and consequences ("I shouldn't steal because I'll get punished"). The conventional level emphasizes following rules and gaining approval ("I follow laws because that's what good citizens do"). The highest postconventional level centers on abstract principles and valuing all life ("Some laws might be unjust and should be changed").

Success Tip: Understanding these developmental stages helps you recognize where you are in your own journey! Most high school students are transitioning into formal operational thinking and working through identity formation.

These developmental theories aren't just academic concepts—they explain why you think differently now than you did as a child and help predict the challenges you'll face in different life stages.

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Psychology

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Updated Feb 17, 2026

•

2 pages

Exploring Key Concepts in Developmental Psychology

@mowers_mbbh

Psychology's developmental unit explores how humans change physically, cognitively, and socially throughout their entire lifespan. This fascinating field examines everything from prenatal development to the challenges of old age, helping us understand the predictable patterns and milestones that shape who... Show more

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Developmental Psychology Foundations

Think About It: The way you bonded with your parents as a baby might influence your relationships today. Most infants (about 65%) develop secure attachments, giving them confidence to explore their world.

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Cognitive and Social Development

Success Tip: Understanding these developmental stages helps you recognize where you are in your own journey! Most high school students are transitioning into formal operational thinking and working through identity formation.

These developmental theories aren't just academic concepts—they explain why you think differently now than you did as a child and help predict the challenges you'll face in different life stages.