Biopsychology 7/15 Flashcards

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1
Q

The sleep/wake cycle

A

The fact that we feel drowsy when it’s night-time and alert during the day demonstrates the affect of daylight - an important exogenous zeitgber - on our sleep/wake cycle.

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2
Q

Exogenous zeitgebers

A

External cues in the environment that entrain our endogenous rhythms.

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3
Q

Endogenous pacemakers

A

Internal body clocks that regulate many of our biological rhythms.

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4
Q

Seasonal affective disorder - SAD

A

Depression associated with seasonal changes, usually the onset of winter and decreased darkness.

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5
Q

Stages of sleep

A

90-minute cycles during sleep brain, sleep escalator from stage 1 to 5 and REM. Brain wave activity changes.

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6
Q

What happens in stage 1 of sleep?

A

Light sleep; person can be easily woken. Theta waves in stage 1; person in light sleep and can easily be woken

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7
Q

What happens in stage 2 of sleep?

A

Sleep spindles, theta waves and mixed EEG activity. Light sleep where person can be easily woken.

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8
Q

What waves are present in stage 3 and 4 of sleep?

A

Involves delta waves that are slower and greater amplitude than earlier wave patterns. This is deep sleep/slow wave sleep and it’s difficult to rouse somebody at this point.

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