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Stimuli Selection and Configuration

In the Stimuli tab () of a task, you can choose to only use a subset of the stimuli, and make various changes to the way they are displayed or played.

Source

This is the basic set of stimuli, which the options below can further refine.

  • None: this is for tasks that do not require any stimuli.
  • Preceding Task : stimuli used in a task that precedes this one
    • copy all: All stimuli configured for the selected task.
    • selected only: Only use stimuli that the participant chose for a "selector" category in the Category Induction task.
    • labels: Use participant's own labels as written in a preceding Label Task.
  • Stimulus Set: start from all stimuli in one of your pre-compiled sets

Trials

Many tasks have a concept of trials, where a subset of the stimuli is presented. Other tasks inherently have just a single "trial" or screen.

  • generated by task: Task logic automatically determines trials based on the task parameters.
  • upload file when creating batch: Manually specify trials with a Trial File.
  • from sampling: Trials determined by sampling algorithm.

Filter

  • Exclude Preceding Choose to filter out any stimuli used in the selected task(s). Note that the task must precede the current one for this to work.
  • By Type Select only stimuli with the selected file extensions.
  • By Name Select only the stimuli with the selected names (file names).

Sample

See the in-depth guide on Sampling for more details.

  • All This uses all stimuli to a maximum of 1000 (in which case the first 1000 are selected).
  • Random This selects a random subset for each new participant.
  • Balanced Aims to sample all stimuli a roughly equal amount of times across participants.

Configuration

These are settings that affect the way a stimulus is displayed or played.

mute video

play video stimuli with sound turned off.

only show highlighted

image or video stimuli are hidden until the participant hovers over them with the mouse.

box text

text stimuli can be grabbed for dragging anywhere in a box around the text; if turned off the text can only be selected on the actual letters

box text opaque

see box text; if selected, the box is not transparent and will hide stimuli underneath

suppress highlight while dragging

stimuli will revert to their unhighlighted (text: short) version when moved.

play mode

Which stimuli in the trial will play and how long:

  • once: Played once when triggered, until the end of the clip.
  • once from the start: Played once, but will rewind every time triggered.
  • repeat: Will keep looping when triggered.
  • continuous: All stimuli loop continuously.
audio icon style

whether sound stimuli should be represented as a circle or square.

text size

when setting the item size in the task settings, affect the size of the font or the box (as other stimuli types).

multiline text scale

If stimuli vary in the number of lines they span, should the font or the box size change. If the box is changed, than the font becomes smaller and vice-versa.