With head mounted optics that bounce a small IR beam off of a
visor and onto the participants eye, we found that we could
achieve good calibration accuracy by asking participants to simply
lock the reflection of the beam in the visor onto some small
unmoving target in the environment (you nearly always have to
switch off the lab lights to make participants aware of the small red
dot in their visual field in the first instance). Like others have
noted: probably not accurate enough for reading experiments, but a
quick and easy head stabilization method that doesn't require any
other equipment.
Steve Rogers (BSc Hons, PGDip)
Centre for Ecological Psychology
Department of Psychology
University of Portsmouth
King Henry Building
Portsmouth
PO1 2DY
Tel: (023) 9284 6322
email: [log in to unmask]
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