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Introduction to Psychology: Key Concepts Vocabulary

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  • Natural-nurture issue

    The debate over the relative contributions of genetics (nature) and environment (nurture) to human development and behavior.

  • Natural selection

    The process by which traits that enhance survival and reproduction become more common in successive generations.

  • Evolutionary psychology

    The study of how evolutionary principles such as natural selection influence human thoughts, feelings, and behaviors.

  • Behavior genetics

    The field that studies the relative power and limits of genetic and environmental influences on behavior.

  • Mutation

    A random error in gene replication that leads to a change in the genetic code.

  • Environment

    Every external influence, from prenatal nutrition to social experiences, that affects an individual’s development.

  • Heredity

    The genetic transmission of characteristics from parents to offspring.

  • Genes

    The biochemical units of heredity that make up chromosomes and direct the development of traits.

  • Identical (monozygotic) twins

    Twins who develop from a single fertilized egg that splits, creating genetically identical individuals.

  • Fraternal (dizygotic) twins

    Twins who develop from separate fertilized eggs and are genetically no more similar than regular siblings.

  • Interaction

    The interplay that occurs when the effect of one factor (such as environment) depends on another factor (such as heredity).

  • Nervous system

    The body's speedy, electrochemical communication network consisting of all nerve cells.

  • Central nervous system

    The brain and spinal cord, responsible for processing information and directing responses.

  • Peripheral nervous system

    The sensory and motor neurons that connect the central nervous system to the rest of the body.

  • Sensory neurons

    Neurons that carry incoming information from the sensory receptors to the central nervous system.

  • Motor neurons

    Neurons that carry outgoing information from the central nervous system to muscles and glands.

  • Interneurons

    Neurons within the central nervous system that communicate internally and intervene between sensory inputs and motor outputs.

  • Somatic nervous system

    The division of the peripheral nervous system that controls voluntary muscle movements.

  • Autonomic nervous system

    The part of the peripheral nervous system that controls involuntary functions like heartbeat and digestion.

  • Sympathetic nervous system

    The division of the autonomic nervous system that arouses the body, mobilizing energy in stressful situations.

  • Parasympathetic nervous system

    The division of the autonomic nervous system that calms the body and conserves energy after stress.

  • Reflex

    An automatic, involuntary response to a stimulus, often processed by the spinal cord.

  • Neuron

    A nerve cell that is the basic building block of the nervous system.

  • Cell body

    The part of a neuron that contains the nucleus and keeps the cell alive.

  • Dendrites

    Branchlike extensions of a neuron that receive messages and conduct impulses toward the cell body.

  • Axon

    The long fiber that carries electrical impulses away from the neuron's cell body to other neurons or muscles.

  • Myelin sheath

    A fatty layer that insulates axons and speeds up neural impulses.

  • Glial cell

    Cells in the nervous system that support, nourish, and protect neurons.

  • Action potential

    A neural impulse; a brief electrical charge that travels down an axon.

  • Threshold

    The level of stimulation required to trigger a neural impulse.