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Environmental Psychology

Impact of disrupting biological rhythms on behaviour

  • 3 things to know
  • Component 03

Overview

Recall questions on desynchronisation, jet lag and the direction of travel, rotating shift work and its health consequences, accidents in the early morning, phase delay and phase advance, seasonal affective disorder, and free will and determinism.

What you need to know

Answer each one before you reveal it.

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Key term

Why do serious accidents cluster in the early hours of the morning?

Key term

List three effects of jet lag.

Process

How does rotating shift work disrupt biological rhythms?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is meant by desynchronisation?

    Model answer

    It is a state in which the internal body clock is out of step with the external day or with other internal rhythms, as happens in jet lag and shift work.

  2. 2

    Why does travelling east produce worse jet lag than travelling west?

    Model answer

    Travelling east requires a phase advance, going to sleep earlier, which is harder for a clock that naturally runs slightly longer than 24 hours than the phase delay required when travelling west.

  3. 3

    List three effects of jet lag.

    Model answer

    Daytime sleepiness with night-time insomnia, impaired concentration and memory, and digestive upset with low mood.

  4. 4

    How does rotating shift work disrupt biological rhythms?

    Model answer

    Workers must be alert during the circadian trough and sleep during the day against rising body temperature and cortisol, so the clock never fully entrains to any one schedule before it changes again.

  5. 5

    Give two health consequences linked with long-term shift work.

    Model answer

    Higher rates of cardiovascular disease and gastrointestinal problems, together with chronic sleep debt and an increased risk of depression.

  6. 6

    Why do serious accidents cluster in the early hours of the morning?

    Model answer

    Alertness and core body temperature are at their lowest then, so reaction times slow and errors, lapses of attention and microsleeps become far more likely.

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