Methods of Investigation

Laboratory Experimentation

The IV often involves giving drugs, removing part of the brain or stimulating the brain to look at the effects on behaviour, the DV.

Laboratory Observations

Controlled observations of our biological processes. Sleep laboratories are often used to look at brain activity.

Correlations

Correlations measure the relationship between 2 variables to see if there is a trend or pattern. Physiological psychologists have found a significant positive correlation between time spent in rapid eye and time spent in REM sleep.