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Understanding Human Behaviour

The biological perspective on behaviour

  • 3 things to know
  • A2 6

Overview

Central claim of the biological perspective, concordance rate and proposed role of testosterone in aggression.

What you need to know

Answer each one before you reveal it.

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Key term

State the central claim of the biological perspective.

Key term

What is a concordance rate?

Key term

Why do researchers compare identical and non-identical twins?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    State the central claim of the biological perspective.

    Model answer

    The biological perspective claims that behaviour has physical causes in genes, brain structure, neurotransmitters and hormones.

  2. 2

    What is a concordance rate?

    Model answer

    A concordance rate is the percentage of twin pairs in which both twins show a particular characteristic, and researchers use it to estimate genetic influence.

  3. 3

    Why do researchers compare identical and non-identical twins?

    Model answer

    Identical twins share all their genes while non-identical twins share about half, so a higher concordance rate in identical pairs is taken as evidence of a genetic contribution.

  4. 4

    What do adoption studies add to twin research?

    Model answer

    Adoption studies compare adopted children with their biological and adoptive parents, separating inherited influence from the influence of the home a child grows up in.

  5. 5

    What does twin evidence suggest about depression?

    Model answer

    Twin evidence suggests that vulnerability to depression is partly inherited, because concordance is consistently higher in identical than in non-identical pairs, though it is well short of complete.

  6. 6

    Which neurotransmitters are most often linked to depression?

    Model answer

    Serotonin and noradrenaline are the neurotransmitters most often linked to depression, and the monoamine explanation proposes that low activity of these chemicals underlies low mood.

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