Chapter 4 Definitions Flashcards Preview

Psychology Units 3+4 > Chapter 4 Definitions > Flashcards

Flashcards in Chapter 4 Definitions Deck (12):
1

Circadian rhythms

Biological rhythms with cycles that occur on a 24 hour cycle (Eg. Sleep/wake pattern, alertness, body temperature etc.).

2

Ultradian rhythms

Biological rhythms with cycles shorter than 24 hours (Eg.REM/NREM cycles).

3

Somnambulism

Sleepwalking.

4

Night terrors

When a person wakes up (often screaming) in sheer terror but rapidly returns to sleep and has no recollection of the event the next morning.

STAGES 3&4 NREM - Common in young children (3-6 years old).

5

Hypnogram

The graph which the REM/NREM cycle is plotted on.

6

Hypnogogic state

The relaxed state that occurs during the transition from being awake to being asleep.

7

Hypnic jerk

Involuntary muscle twitches that cause us to jolt.

8

Muscle Atonia

The total relaxation of muscles to the point of paralysis when in REM sleep.

9

Hypnopompic state

Period between being asleep and waking up, a time when the brainwaves are predominantly alpha waves.

- Hypnopompic (vivid) images are often seen during this phase.

10

Explain the survival theory of sleep

Suggests that organisms undertake periods of inactivity, or sleep, in order to enhance their chances of survival. They do this by conserving energy and protecting themselves during periods of the day when they are most vulnerable.

11

Explain the restorative theory of sleep

Suggests that sleep allows us to recharge our bodies, recover from the physical/physiological work during the day and allows our bodies' growth processes to function.

12

Infradian rhythms

Biological rhythms with cycles longer than 24 hours (Eg. Menstrual cycle).