Abstract：
:In the precedence effect, sounds emanating directly from the source are localized preferentially over their reflections. Although most studies have focused on the delay between the onset of a sound and its echo, humans still experience the precedence effect when this onset delay is removed. We tested in barn owls the hypothesis that an ongoing delay, equivalent to the onset delay, is discernible from the envelope features of amplitude-modulated stimuli and may be sufficient to evoke this effect. With sound pairs having only envelope cues, owls localized direct sounds preferentially, and neurons in their auditory space-maps discharged more vigorously to them, but only if the sounds were amplitude modulated. Under conditions that yielded the precedence effect, acoustical features known to evoke neuronal discharges were more abundant in the envelopes of the direct sounds than of the echoes, suggesting that specialized neural mechanisms for echo suppression were unnecessary.
journal_name
Neuronjournal_title
Neuronauthors
Nelson BS,Takahashi TTdoi
10.1016/j.neuron.2010.07.014subject
Has Abstractpub_date
2010-08-26 00:00:00pages
643-55issue
4eissn
0896-6273issn
1097-4199pii
S0896-6273(10)00552-0journal_volume
67pub_type
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