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Science 22 November 2002:
Vol. 298. no. 5598, pp. 1627 - 1630
DOI: 10.1126/science.1075396
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Reports
Combining Sensory Information: Mandatory Fusion Within, but Not Between, Senses
J. M. Hillis,1* 
M. O. Ernst,2*
M. S. Banks,13
M. S. Landy4
Humans use multiple sources of sensory information to estimate
environmental properties. For example, the eyes and hands both provide
relevant information about an object's shape. The eyes estimate shape
using binocular disparity, perspective projection, etc. The hands
supply haptic shape information by means of tactile and proprioceptive
cues. Combining information across cues can improve estimation of
object properties but may come at a cost: loss of single-cue
information. We report that single-cue information is indeed lost when
cues from within the same sensory modality (disparity and texture
gradients in vision) are combined, but not when different modalities
(vision and haptics) are combined.
1 Vision Science Program, School of Optometry,
University of California, Berkeley, CA 94720-2020, USA.
2 Max-Planck Institute for Biological Cybernetics,
Spemannstra e 38, 72076, Tübingen, Germany.
3 Department of Psychology, University of
California, Berkeley, CA 94720-1650, USA.
4 Department of Psychology and Center for Neural
Science, New York University, 6 Washington Place, New York, NY 10003, USA.
*
These authors contributed equally to this work.
Present address: University of Pennsylvania,
Department of Psychology, 3815 Walnut Street, Philadelphia, PA, 19104, USA.
To whom correspondence should be addressed. E-mail:
jmhillis{at}CATTELL.psych.upenn.edu
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