Sample
How many participants were involved in the Dement and Kleitman sleep study?
9
How many observation trials were conducted in Hassett?
7
How did Dement & Kleitman measure brain wave activity?
Using an EEG and EOG
How did the researchers ensure the monkeys were not isolated?
The monkeys were housed within their usual social groups
How long is a full sleep cycle?
90 minutes
What species was studied in Hassett
Rhesus Monkeys
Name two toys used in Hassett
There were six wheeled toys: wagon, truck, car, construction vehicle, shopping cart and dump truck, seven plush toys: Winnie-the-PoohTM, Raggedy- AnnTM, Scooby-DooTM and four soft toy animals, including a koala, armadillo, teddy and turtle
What was the type of experimental design of Hassett?
Independent Measures
How did Dement and Kleitman maintain confidentiality?
By only using the initials of the participants
Describe REM sleep
Eyes flicker and move beneath eyelids, but other muscles paralysed
How many male and female monkeys were tested in Hassett?
11 (m) 23 (f)
What was the time duration of observation per trial in Hassett?
25 minutes
Which of the aims of Dement & Kleitman required a correlational method?
Aim 4: to see if there is a positive correlation between length of REM and number of words given in a dream narrative
They ate monkey chow twice a day and were fed fresh fruit and vegetables every day.
What does Hassett's conclusion suggest about nature vs nurture?
Even in non-human animals without social influences, toy preferences aligned with gender, suggesting a biological influence
Dement & Kleitman Sampling Technique
Opportunity Sample
Participants in Dement and Kleitman were awoken using a...
Doorbell
Aside from experimental and correlational methods, what other method did Dement and Kleitman use?
Interview
How large was the outdoor enclosure in Hassett?
25 square metres
What is the wave pattern of REM sleep?
High frequency, low amplitude
What was a shortcoming of Hassett's sample?
The lack of adult males in the sample was a weakness. The 11 male monkeys were al either juvenile, subadult or elderly.
Toys were always placed ten metres apart and the positions were counterbalanced — wheeled toys were on the right and plush on the left in half of the trials and the other way around on the remaining trials.
What kind of observational technique did Hassett use?
Structured observation
How did the indoor area in Hassett follow the ethical guideline of Housing?
The area was temperature controlled
What is a condition in which girl babies are exposed to more prenatal androgens?
Congenital Adrenal Hyperplasia