Wundt used INTROSPECTION – the examination of one’s own mental state – training people to introspect using strict rules: (1) observers must be able to determine when the process is to be introduced. (2) they must be in a state of readiness or strained attention. (3) it must be possible to repeat the observation several times. (4) the experimental conditions must be capable of variation in terms of the controlled manipulation of the stimuli.
