Academic Journal
Beamforming as a mechanism for azimuthal localization of targets by FM-echolocating big brown bats.
| Τίτλος: | Beamforming as a mechanism for azimuthal localization of targets by FM-echolocating big brown bats. |
|---|---|
| Συγγραφείς: | Simmons JA; Department of Neuroscience, Carney Institute for Brain Science, Brown University, Providence, RI, 02912, USA. James_Simmons@brown.edu., Simmons AM; Department of Neuroscience, Carney Institute for Brain Science, Brown University, Providence, RI, 02912, USA.; Department of Cognitive & Psychological Sciences, Carney Institute for Brain Science, Brown University, Providence, RI, 02912, USA. |
| Πηγή: | Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology [J Comp Physiol A Neuroethol Sens Neural Behav Physiol] 2026 Sep; Vol. 212 (5), pp. 901-911. Date of Electronic Publication: 2026 Aug 07. |
| Τύπος έκδοσης: | Journal Article; Review |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Springer Country of Publication: Germany NLM ID: 101141792 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1432-1351 (Electronic) Linking ISSN: 03407594 NLM ISO Abbreviation: J Comp Physiol A Neuroethol Sens Neural Behav Physiol Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: Berlin ; New York : Springer, c2001- |
| Ιατρικοί όροι (MeSH): | Chiroptera*/physiology , Echolocation*/physiology , Sound Localization*/physiology , Inferior Colliculi*/physiology , Inferior Colliculi*/cytology, Neurons/physiology ; Auditory Pathways/physiology ; Animals ; Acoustic Stimulation ; Models, Neurological |
| Περίληψη: | Echolocating big brown bats broadcast downward-sweeping, frequency-modulated (FM) biosonar sounds and process the returning echoes to track and capture flying insects. Neurons in the inferior colliculus are tuned to different frequencies along the FM sweep and form a representation of target azimuth largely on the basis of sensitivity to interaural differences in intensity, with canonical interaural time difference cues by themselves less reliable. Here, we reanalyze neurophysiological data on binaural sensitivity of inferior colliculus neurons consistent with a signal-processing model used in engineered sonar for generating directional beams. Model inputs are the times-of-occurrence of phasic-on responses to FM sweeps presented at a range of interaural intensities and azimuths. Tuning curves for interaural intensity were computed, and the slopes of these tuning curves plotted against neuronal best frequency and sound azimuth. The resulting aggregate plots suggest that the bat forms two distinct beams, one encompassing the entire FM sweep for a narrow zone of azimuths straight ahead and the other restricted to lower frequencies and offside to the left and the right. When interpreted with respect to psychophysical data, these analyses suggest that the forward beam allows for acute target perception, while the offside beams allow for perception of multiple objects that constitute clutter. The distribution of azimuths further suggests the formation of numerous detailed offside beams pointing in different directions to accommodate the width of the spatial arrangement of the clutter. (© 2026. The Author(s).) |
| Competing Interests: | Declarations. Conflict of interest: AMS is an associate editor of JCP-A. Ethical approval: Not applicable. Consent to participate: Not applicable. Consent for publication: All authors agree to publication. |
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| Contributed Indexing: | Keywords: Binaural differences; Biosonar; Echo delay; Echolocation; Horizontal localization |
| Entry Date(s): | Date Created: 20260807 Date Completed: 20261006 Latest Revision: 20261008 |
| Update Code: | 20261008 |
| DOI: | 10.1007/s00359-026-01834-0 |
| PMID: | 42567940 |
| Βάση Δεδομένων: | MEDLINE |
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