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IB Psychology HL - BLOA - Outline and Explain How Bloa Principles Can Be Demonstrated In Research

Psychology6 CardsCreated about 1 month ago

This is shown by twin and adoption studies — for instance, the Minnesota Twin Study demonstrated high concordance rates in traits like intelligence among identical twins reared apart, pointing to genetic influence on behaviour.

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principles of BLOA

Principle 1: patterns of behaviour are heritable
Principle 2: animal research may inform our understanding of human behaviour
Principle 3: cognition, emotion, and behaviour are products of the physiology of our nervous and endocrine systems

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Key Terms

Term
Definition

principles of BLOA

Principle 1: patterns of behaviour are heritable
Principle 2: animal research may inform our understanding of human behaviour
Principle 3: co...

Principle 1

patterns of behaviour are heritable
- well supported by genetics and evolutionary psychology studies
- but behaviour is reliant on environmen...

Caspi and Moffitt (2012)

  • conducted 26 year longitudinal study

  • involved 1036 children born in 1972 NZ

  • children inheriting a short versi...

Principle 2

animal research may inform our understanding of human behaviour

  • a biological approach is based on the idea that all animal species ev...

Suomi and Lesch (2002)

  • identified a gene that affects effectiveness of processing serotonin

  • cerebral spinal fluid of 132 juvenile rhesus monkeys wa...

Principle 3

cognition, emotion, and behaviour are products of the physiology of our nervous and endocrine systems

  • adrenaline is associated with c...

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IB Psychology HL - BLOA - Outline and Explain How Bloa Principles Can Be Demonstrated In Research
TermDefinition

principles of BLOA

Principle 1: patterns of behaviour are heritable
Principle 2: animal research may inform our understanding of human behaviour
Principle 3: cognition, emotion, and behaviour are products of the physiology of our nervous and endocrine systems

Principle 1

patterns of behaviour are heritable
- well supported by genetics and evolutionary psychology studies
- but behaviour is reliant on environment too, not just genetic inheritance
Supporting study: Caspi and Moffitt (2012)

  • identical twins (monozygotic twins - MZ) are 100% genetically identical because developed from same egg which means one acts as a control for the other

  • however, twin research never shows 100% concordance rate

  • one can infer that genes are a predisposing factor rather than the direct cause of behaviour

Caspi and Moffitt (2012)

  • conducted 26 year longitudinal study

  • involved 1036 children born in 1972 NZ

  • children inheriting a short version of the gene MAOA were more likely to exhibit aggression

  • but this was only in cases where the children experienced an abusive upbringing

  • carriers of MAOA who experienced good parenting were usually normal

Principle 2

animal research may inform our understanding of human behaviour

  • a biological approach is based on the idea that all animal species evolved from a common ancestor

  • thus animals are fundamentally similar in many ways

  • mechanisms that underlie behaviour one of those similarities

Supporting study: Suomi and Lesch (2002)

Suomi and Lesch (2002)

  • identified a gene that affects effectiveness of processing serotonin

  • cerebral spinal fluid of 132 juvenile rhesus monkeys was collected

  • analysed for serotonin metabolite traces (high metabolite level = high efficiency of serotonin processing)

  • monkeys that had low metabolite levels were more aggressive

Principle 3

cognition, emotion, and behaviour are products of the physiology of our nervous and endocrine systems

  • adrenaline is associated with creation of emotion
    Supporting study: Schachter and Singer (1962)

  • aggression has been linked to various brain structures
    Supporting study: Raine et al. (1997)