Biological Rhythms Flashcards
What are infradian rhythms?
Rhythms that last more than 24 hours.
What is an example of an infradian rhythm?
The menstrual cycle.
What did McClintock and Stern’s study involve?
Women receiving odorless compounds from other women.
What was the outcome of the McClintock and Stern study?
It suggested that menstrual cycles can synchronize among women.
What is a limitation of the evidence for pheromones affecting menstrual cycles?
There is not enough evidence to support the claims.
What are circadian rhythms?
Cyclical changes in biological systems that last 24 hours or less.
What can affect circadian rhythms?
Deprivation of external environmental cues.
What did the cave study demonstrate regarding circadian rhythms?
Participants maintained a sleep cycle of about 24 hours without daylight.
What are ultradian rhythms?
Biological rhythms lasting less than 24 hours.
What is an example of an ultradian rhythm?
Sleep cycles.
What did Dement and Kleitman’s study investigate?
Brain activity changes throughout the night during sleep.
What methodology was used in Dement and Kleitman’s study?
Participants reported to a lab at bedtime and were connected to EEG for measurements.
What are the stages of sleep identified in the study?
Stages 1-3 last 5-15 minutes, Stage 4 lasts 40 minutes, and REM lasts 15 minutes.
What is the significance of REM sleep?
It lengthens throughout the night and is associated with vivid dreams.
What was a key finding regarding dreaming in the study?
Dreaming varied according to the type of dream and was linked to REM sleep.
What was a limitation noted in the accuracy of sleep cycle measurements?
There was inconsistency and variation in sleep/wake cycles.
What is an example of circadian rhythms?
Sleep- wake cycle
