Comprehensive Summary of Unit One: Biological Basis of Behavior in AP Psychology

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Overview of Unit One: Biological Basis of Behavior in AP Psychology

Introduction

  • Welcome to the Unit One summary for AP Psychology, focusing on the biological basis of behavior.
  • The unit emphasizes how biological systems influence physical and mental actions.
  • A study guide is available for note-taking and review.

Nature vs. Nurture

  • The debate has evolved from nature or nurture to nature and nurture.
  • Nature refers to heredity, while nurture encompasses environmental factors.
  • The evolutionary approach, based on Darwin's theory, leans towards nature, emphasizing heredity's role in behavior. For a deeper understanding of how biological factors influence personality, check out Understanding the Brain: The Link Between Neuroanatomy and Personality.
  • Epigenetics studies how environmental factors affect gene expression, explaining differences in identical twins raised apart.

Nervous System Overview

  • The Central Nervous System (CNS) includes the brain and spinal cord, while the Peripheral Nervous System (PNS) connects the CNS to the body.
  • Afferent neurons send signals to the CNS, and efferent neurons send signals from the CNS.
  • The PNS is divided into the somatic nervous system (voluntary movements) and the autonomic nervous system (involuntary functions).
  • The autonomic system further divides into the sympathetic (fight or flight) and parasympathetic (rest and digest) systems.

Neurons and Neural Transmission

  • Glial cells support neurons, while neurons are the functional units of the nervous system.
  • The reflex arc involves sensory, motor, and interneurons, allowing quick responses to stimuli.
  • Neural transmission involves action potentials, synapses, and neurotransmitters, which can be excitatory or inhibitory.

Neurotransmitters and Hormones

  • Key neurotransmitters include acetylcholine, dopamine, serotonin, and endorphins, each with specific functions.
  • The endocrine system regulates hormones like adrenaline and oxytocin, influencing behavior and emotions.

Brain Structures

  • The brain is divided into three regions: hindbrain, midbrain, and forebrain.
  • Key structures include the cerebellum (coordination), cerebrum (complex thought), and various lobes (frontal, parietal, temporal, occipital).
  • The thalamus acts as a relay station for sensory information.

Sleep and Consciousness

  • Sleep involves different stages, including REM and non-REM sleep, each with distinct brain wave patterns.
  • The circadian rhythm regulates sleep-wake cycles, and sleep disorders like insomnia and sleep apnea can disrupt this balance.

Sensation and Perception

  • Sensation is the detection of environmental stimuli, while perception is the interpretation of those stimuli.
  • The visual system processes light, while the auditory system processes sound, each with specific theories explaining how we perceive them. For more on the biological aspects of perception, see Understanding Life: A Journey Through Biology and Genetics.
  • The chemical senses (smell and taste) interact closely to create flavor experiences.

Conclusion

  • Understanding the biological basis of behavior is crucial for AP Psychology students.
  • Review resources and practice quizzes are available to reinforce learning and prepare for exams. For additional context on historical perspectives, refer to A Comprehensive Review of Unit 2: AP US History (1607-1754).

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