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What are Treatment Events?
A treatment event is an action taken to manipulate something in your experiment to study its effects on your dependent variable. For example, you might be interested in studying the effects of drinking coffee on reading performance. Treatment variables are called "treatments," "interventions," "change variables," and "stimuli," depending on the nature and setting of the study. The statistical term for these variables is generally "Independent variables," although this may be deceiving since variables are seldom independent of other influences. Treatment variables can be categorical in measurement as in "gender" or continuous, as in "letter contrast." In statistical analysis, categories are generally called "levels," and these are often treated as separate treatments. For example, one might investigate and compare the effects of blue, green, gray, and no filters on reading speed. The planned manipulation of an independent variable is a treatment event.
Same-Page Stimulus and Measurement Presentation Options
There are two special page formats for presenting visual treatment (stimuli) events and one generic format for more complex multiple-event screens. The first special format is called "Image Stimuli" and the second is called "Text Stimuli." Both are contained in the list of treatment types under Treatments under the Create menu in the Events window of the Edit Protocol Page of the PG Composer. These presentation options provide an easy way to present a stimulus and a measurement on the same page. For details, see, click here.
For a more general way to present multiple-events on the same page, see PG Executable Forms.