Attention does not affect multisensory cue weighting
Poster Presentation

Hannah Helbig
Max Planck Institute for Biological Cybernetics

Marc Ernst
Max Planck Institute for Biological Cybernetics

     Abstract ID Number: 51
     Full text: Not available
     Last modified: March 16, 2005

Abstract
Humans gather information about their environment from multiple sensory channels. It seems that cues from separate sensory modalities (e.g., vision and haptics) are combined in a statistically optimal way according to a maximum-likelihood estimator (Ernst & Banks, 2002). Ernst and Banks showed that for bi-modal perceptual estimates, the weight attributed to one sensory channel changes when its relative reliability is modified by increasing the noise associated to its signal.
Here we address the question as to whether selectively increasing the attentional load of one sensory channel does affect the weighting of cues from different sensory channels.
In our experiment, subjects’ main-task was to estimate the size of a raised bar using vision alone, haptics alone, or both modalities combined. Their performance in the main-task condition alone is compared to the performance obtained when a concurrent visual ‘distractor’-task is performed. We found that vision-based estimates are more affected by a visual ‘distractor’ than the haptics-based estimates. Thus, attention is indeed selectively detracted from the visual modality. Moreover, we found that the cue weighting is not affected by adding the visual ‘distractor’-task.
Therefore we can conclude that multisensory integration occurs at an early stage of processing and is not affected by attention.