Institute for Language Sciences Labs


Head-Turn Preference Procedure


  • Client(s): Maartje de Klerk
  • Author(s): Chris van Run, Theo Veenker
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Purpose of this ZEP-based experiment is to see whether an infant participant
can detect a difference between two types of auditory stimuli. The
infant sits on the caregiver lap facing a wall on which a green
light, an invisible speaker and a camera is mounted. On each side
wall a red light (or other visual stimuli) and an invisible speaker are mounted.
In this implementation there is a familiarization phase and a test phase.

For each trial in the test phase the infant’s attention is drawn to
one the side lights (blinking). When the infant looks at the blinking
light a sequence of sound stimuli starts and a timer runs as long
as the infant keeps looking at the blinking light. The trial ends
when the infant looks away too long (or when a particular number of
stimuli have been presented). In the familiarization phase that
precedes the test phase a similar contingency procedure is used but
only for the lights; the sound stimuli once started continue until
all have been presented.


Please refer to the for details!


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.