Ultradian Rhythms (AQA A-Level Psychology): Flashcards
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Ultradian rhythms definition
Ultradian rhythms definition
Biological rhythms lasting less than 24 hours
Duration of one complete sleep cycle
Duration of one complete sleep cycle
Approximately 90 minutes
Number of sleep cycles in a normal night
Number of sleep cycles in a normal night
About 5 full cycles
Number of distinct sleep stages
Number of distinct sleep stages
Five stages (1-4 plus REM)
Brain activity pattern in Stage 2 sleep
Brain activity pattern in Stage 2 sleep
Sleep spindles (short bursts of brain activity)
Duration of Stage 4 sleep per cycle
Duration of Stage 4 sleep per cycle
Approximately 40 minutes
Hormones released during Stage 4 sleep
Hormones released during Stage 4 sleep
Growth hormones
Brain activity level during REM sleep
Brain activity level during REM sleep
More than any other sleep stage
When do dreams most likely occur?
When do dreams most likely occur?
During REM sleep (high probability)
Dement & Kleitman (1957) key finding
Dement & Kleitman (1957) key finding
High dream recall when awakened during REM periods