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Welcome!
• Primary instructor: Tessa Abagis– Email: [email protected]
• Other instructors– Colleen Frank: [email protected]– Lilian Cabrera: [email protected]
Workshop Outline
• Day 1:– Introduction to E-Prime
• Functions• E-Studio GUI
– Programming a task• Build basic Stroop task
• Day 2:– Adapt the task for the scanner– Try out E-Recovery, E-Merge, E-DataAid, etc– “Office” hour(ish)
Introduction to E-Prime
• What does E-Prime allow you to do?– Design experiments (E-Studio)– Generate and run experiments (E-Run)– Edit and analyze data (E-Merge and E-DataAid)
• Note: E-Prime is not free, and requires a license
Designing Experiments• Typically, experiments are designed hierarchically– Experiment level: there is a specific sequence of
events that subjects will go through in the experiment• Ex. See instructions à do practice block à do experimental
block– Block level: within a block, there are variables that
influence each trial• Ex. different categories of stimuli; different correct
responses– Trial level: there is a specific sequence of events that
subjects will be doing on each trial• Ex. Fixation à see stimuli à respond to stimuli based on
task rules
E-Studio
• E-Prime is hierarchical• Types of E-Objects
1. Flow control (procedure, in-line, labels)
2. Sampling (lists)3. Stimulus presentation
(text, image, etc.)
E-Objects: Stimulus Presentation
Slide
Text Display
Feedback Display
Image Display
Sound Out
Sound In
E-Run• When experiment starts, it will prompt you for:– Subject number– Session number– Other options
• Group number• Counterbalance number• Age, sex, handedness
– Will warn you if there is already a file with those specifications
• When experiment ends (successfully), it will generate a text file and a data file (e-dat file)
E-Run
• To abort mid-experiment– Ctrl-Alt-Shift– NOT Ctrl-Alt-Del
• If experiment ends prematurely (through aborting or crashing), only a text file will be generated– E-Recovery allows you to recover data from a text
file
E-DataAid
• Analyze data with Tools à Analyze– Drag variables into columns and rows– Drag dependent measure(s) into Data box• Can change dependent measure result (mean, standard
deviation, etc.)– “Filter” to select restrictions to limit data– “Save Analysis” to use analysis again– Run
E-DataAid
• Tips– Program your task and set up analyses in a clear,
intuitive way• Pilot your task and “pilot” your analyses• Save and comment on your analyses
– Any edits to the data (changed data, deleted data, new variables) will be red• Deleted or absent cells = “NULL”
– Cannot delete rows or columns• Be mindful of a variable’s level when editing it