Title
Sensorimotor model of obstacle avoidance in echolocating bats Sensorimotor model of obstacle avoidance in echolocating bats
Author
Faculty/Department
Faculty of Applied Economics
Publication type
article
Publication
Subject
Mathematics
Chemistry
Biology
Engineering sciences. Technology
Computer. Automation
Source (journal)
PLOS Computational Biology
Volume/pages
11(2015) :10 , p. 1-31
ISSN
1553-7358
1553-734X
Article Reference
e1004484
ISI
000364399700040
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Bat echolocation is an ability consisting of many subtasks such as navigation, prey detection and object recognition. Understanding the echolocation capabilities of bats comes down to isolating the minimal set of acoustic cues needed to complete each task. For some tasks, the minimal cues have already been identified. However, while a number of possible cues have been suggested, little is known about the minimal cues supporting obstacle avoidance in echolocating bats. In this paper, we propose that the Interaural Intensity Difference (IID) and travel time of the first millisecond of the echo train are sufficient cues for obstacle avoidance. We describe a simple control algorithm based on the use of these cues in combination with alternating ear positions modeled after the constant frequency bat Rhinolophus rouxii. Using spatial simulations (2D and 3D), we show that simple phonotaxis can steer a bat clear from obstacles without performing a reconstruction of the 3D layout of the scene. As such, this paper presents the first computationally explicit explanation for obstacle avoidance validated in complex simulated environments. Based on additional simulations modelling the FM bat Phyllostomus discolor, we conjecture that the proposed cues can be exploited by constant frequency (CF) bats and frequency modulated (FM) bats alike. We hypothesize that using a low level yet robust cue for obstacle avoidance allows bats to comply with the hard real-time constraints of this basic behaviour.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/4e8870/128373.pdf
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