Toward a Multiple-Method View of Mood Induction: The Appropriateness of a Modified Velten Mood Induction Technique and the Problems of Procedures With Group Assignment to Conditions

Abstract

Two methodological issues involving the Velten (1968) mood induction technique are examined. The first issue concerns threats to statistical conclusion validity that result from the use of some group mood induction techniques: In research on the effects of mood, groups of subjects are often assigned to mood conditions, whereas individuals are treated as the unit of analysis. It is argued that this procedure threatens the validity of inferences about mood effects, in particular by inflating Type I error. The use of a group mood induction, with only one mood manipulated in a particular group, also increases the likelihood of experimenter bias, local history effects, or both. This article illustrates an alternative method of group mood induction involving four modifications to the Velten (1968) mood induction procedure. Using this revised procedure, subjects are randomly assigned to different mood conditions, yet the data are collected simultaneously. Results indicate that this method is successful in induci...