Institute for Language Sciences Labs


Four Image Visual World



Purpose of this experiment is to record participant’s eye-movements while he/she is listening to a spoken utterance and looking at a screen displaying a set of four objects. For each trial a set of images is is displayed and an utterance is played. The utterance typically is an instruction to the participant. Participant’s task is to carefully look and listen and to select one of the four objects (using button-box, keyboard or mouse) as instructed. Self-paced. Output: Eye-Tracking data as collected by the eye-tracker, RT and chosen object.

This implementation can be used with an EyeLink eye-tracker (default), a Tobii 1750 eye-tracker, or an SMI eyetracker. You can select the desired device by importing the appropriate module.

Related publications

  • Huettig, F., Rommers, J., Meyer, A.S. (2011). Using the visual world paradigm to study language processing: a review and critical evaluation. Acta Psychologica.

Installation instructions

To run the experiment you need the Zep experiment control application. At the ILS Labs this is already installed on all systems. To install Zep at home or on your personal laptop go to this link and follow instructions there.

To install this experiment:

  1. Download the experiment from this link.
  2. Extract the .zip-file into a target folder (any location will do).
  3. This will produce an experiment folder under the target folder.
  4. Read the readme that comes with the experiment.
  5. Open the console application (under Windows click windows-terminal.bat, under Linux click and type the following command:zep visworld4
    In this command visworld4 represents the name of the experiment you wish to run.


This experiment script comes with absolutely no warranty. It is your responsibility to pilot test the script and analyze the results before using the script for your research. Be sure to know what the adjustable parameters of the script mean and check whether the script presents stimuli and records responses exactly as you want it to. If necessary, ask the author of the script to explain the things you do not yet understand.