Dement and Kleitman AS Level

What are the 3 aims of the study?

1. Does dream recall differ between rapid eye movement

(REM) and quiescent (nREM) stages of sleep?

2. Is there a positive correlation between subjective

estimates of dream duration and the length of the REM period before waking?

3. Are eye-movement patterns related to dream content?

What is the IV for aim 1

the type of sleep stage the participants were awakened from (Rem or nRem)

What is the IV for aim 2

waking participants after either 5 or 15 minutes of REM sleep

What is the IV for aim 3

the direction of eye movement patterns

What is the DV for aim 1

whether the participants reported a dream upon waking and, if so, the specific details of that dream

What was the DV for aim 2

the participant's subjective estimation of whether they had been in REM sleep for 5 or 15 minutes

What is the DV for aim 3

the participant's report of dream content

What type of experiment was the study?

laboratory experiment

What type of experimental design was the study?

repeated measure design

How many people were selected?

9 (7 male 2 female)

How many were mainly studied

5

What were the strengths of the study

a highly standardized, laboratory-based procedure (e.g., controlling caffeine/alcohol intake and using EEG technology), which ensured reliability, allowed for replication, and established a clear, causal relationship between REM sleep and dreaming

What were the weaknesses of the study?

a small sample size (9 participants), low ecological validity due to an unnatural laboratory setting, and reliance on subjective, potentially inaccurate, self-reported dream content