PSYC 230 Lecture Notes - Lecture 8: Internal Validity, Demand Characteristics, Longitudinal Study

• School: University of San Diego
• Department: Psychology
• Course: PSYC 230
• Professor: Goldschmied

Document Summary

Extreme score is more likely to be repeated by a less extreme score. If you show up on the cover of sports illustrated, something bad will happen to you: studying people changes them! Inquiring about future behavior may influence people to be engaged in this particular behavior only because they were asked about it. The tendency to perform better the more time we are engaged in the same task. You should do better in test 2 than test 1. The failure of some of the participants in an experiment to complete the study (longitudinal studies) Homogeneous (external v. ) vs. heterogeneous (internal v. ) Homogeneous - when you have the same number of people from experimental and control not coming back. Heterogeneous - when more people leave the study in one condition than the other. Explain the nature of the study (importance) If aversive condition, expose other conditions subsequently. Conform to expectations by demand characteristics (the good subject, orne, 1959)