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Template: Subliminal Perception Paradigm
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SR Research
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Joined: Sep 2020
Posts: 20

#1
09-09-2020, 03:18 PM
Subliminal Perception Paradigm

Required Experiment Builder Version: 1.4.71 or higher
EyeLink Required: No
Type: Complete Example
Difficulty Level: Medium

This example illustrates:
  • How to use Randomization Setting and the Rollover option
  • How to use the "Retraces" Duration Type in Timer Triggers for more precise timing control
Description:

This example project is an implementation of the Experiment 1A (Parallels in Stroop Priming) on subliminal perception described in the following paper:
  • Merikle, P. M. & Joordens, S. (1997). Parallels between perception without attention and perception without awareness. Consciousness and Cognition, 6, 219-23.
The example project posted here has the following features:
  • Using a variable to select experiment version (Long SOA vs. Short SOA);
  • Timing data is of critical importance for this experiment. To collect accurate time data, the project shows how to encapsulate all of the display (stimuli presentation) events within a real-time sequence while leaving the response selection part outside of the sequence. For the same purpose, the value for the "Duration Type" Properties of Timers within it is set to "retraces" rather than the default "msecs".
  • Used is the identical 24-row Data Source for 1 block of 24 practice trials and 6 block of 48 experiment trials, rather than a 312-row Data Source. Furthermore, to randomize values for the fields (each row) of the Data Source used in every trial, the "Enable Randomization" and "Randomizer on Roll-over" of Randomization Setting of the Data Source are checked.
  • The experiment results are saved to the RESULTS.txt file at the end of the experiment, allowing for cross-checking and analysis of experiment data at the trial level.
  • It is possible for participants to have a rest between practice and experiment trials, and after every 48 experiment trials.
**Additional detailed information about the project is given in the notes section for most nodes. To see notes for a given node, either mouse over that node or click on it to display the notes window. If the notes window is not visible, go to the "View" drop down menu in Experiment Builder, select "Properties", and check "Note".

Instructions:
  1. Download the SubliminalPerception.ebz example from this message.
  2. Launch the Experiment Builder application.
  3. Unpack the SubliminalPerception.ebz file to a location on your Experiment Builder PC with "File menu -> Unpack".
  4. Open the project in Experiment Builder.
  5. Deploy the project to a new folder.
  6. Run the SubliminalPerception.exe from the deployed directory.

.ebz   SubliminalPerception.ebz (Size: 69.42 KB / Downloads: 24)