An adaptive bias
in perceiving looming auditory motion
to a looming sound (.rm), (.wav),
intensity can indicate movement of a sound source toward a listener. Perceptual
overestimation of intensity change could provide a selective advantage
by indicating that the source is closer than actual, providing a better
opportunity for the listener to prepare for the source's arrival. Results
indicate that rising intensity changes in loudness more than equivalent
falling intensity, and approaching sounds are perceived as starting and
stopping closer than equidistant receding sounds. Both effects are greater
for tones than for noise.
We have conducted psychoacoustic
studies, brain imaging studies, sex differences studies, and comparative studies with Rhesus monkeys.
Together, this converging evidence suggests
that an asymmetry in the neural coding of egocentric auditory motion is
an adaptation that provides advanced warning of looming acoustic sources.
For more information
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Herdener, M., Scheffler, K., Seifritz, E. (2008). Rising sound intensity: an
intrinsic warning cue activating the amygdala.. Cerebral
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J. G., Logothetis N. K., Ghazanfar, A. A. (2004). Multisensory
Integration of Looming Signals by Rhesus Monkeys. Neuron,
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Neuhoff, J.G., Logothetis, N.K. (2002). Auditory
looming perception in rhesus monkeys. Proceedings
of the National Academy of Sciences USA. 99 (24) 15755-15757.
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J. G., Bilecen, D., Scheffler, D., Mustovic, H., Schächinger,H.,
Elefante, R., & Di Salle, F. (2002) Neural
processing of auditory 'looming' in the human brain. Current
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Perception of changes in loudness: Reply to CanÚvet
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