PSYC 2030 Study Guide - Midterm Guide: Observer-Expectancy Effect, Blind Experiment, Demand Characteristics
20 Oct 2016
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March 16th test boredom or tiredness associated with having already completed a pre test participants often react to features of an experiment so that the process of making observations can change observations. The passage of time - big problem in experiments that have within subject designs where participants make a number of responses. Both participants and circumstances change, not the treatment. Any changes that result of time passing are generally referred to as instances of maturation effects course of a study. History effects threat to internal validity posed by events occurring between two experimental observations. These events can be of both major import or relatively mundane. Any changes in the participants" circumstances that take place over the identical at pre-test and post test phases of an experiment. internal validity is often posed by participants" reactions to particular experimental procedures or measures. Hawthorne effect: a threat to internal validity posed by people"s awareness that they are participating in research.
