Abstract
Most species of bats making echolocation use frequency modulated(FM) ultrasonic pulses to measure the distance to targets.These bats detect with a high accuracy the arrival time differences between emitted pulses and their echoes generated by targets. In order to clarify the neural mechanism for echolocation, we present neural model of inferior colliculus(IC). The bats increase the downward frequency sweep rate of emitted FM pulse as they approach the target. The functional role of this modulation of sweep rate is not yet clear. In order to investigate the role, we calculated the response properties of our models of IC changing the target distance and the sweep rate. We found based on the simulations that the distance of a target in various ranges may be encoded the most clearly into the activity pattern of delay time map network in IC, when bats adopt the observed FM sweep rate for each range of target distance.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Inoue, S., Kimyou, M., Kashimori, Y., Hoshino, O., Kambara, T.: A neural model of medial geniculate body and auditory cortex detecting target distance independently of target velocity in echolocation. Neurocomputing 32(33), 833–841 (2000)
Inoue, S., Kimyou, M., Kashimori, Y., Hoshino, O., Kambara, T.: A basic neural mechanism for acoustic imaging. In: Yasue, K., Jibu, M., Senta, T.D. (eds.) No matter, Never Mind, Advances in consciousness research, vol. 33, pp. 281–288. John Benjamins, Amsterdam (2002)
O’Neill, W.E., Suga, N.: Target range - sensitive neurons in the auditory cortex of the mustached bat. Science 203, 67–73 (1979)
O’Neill, W.E., Suga, N.: Encoding of target range and its representation in the audi-tory cortex of the mustached bat. J.Neurosci. 2, 17–31 (1982)
Suga, N.: Cortical computational maps for auditory imaging. Neural Networks 3, 3–21 (1990)
Suga, N., O’Neill, W.E.: Neural axis representingtarget range in the auditory cortex of the mustached bat. Science 206, 351–353 (1979)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2004 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Fujita, K., Kamata, E., Inoue, S., Kashimori, Y., Kambara, T. (2004). A Functional Role of FM Sweep Rate of Biosonar in Echolocation of Bat. In: Pal, N.R., Kasabov, N., Mudi, R.K., Pal, S., Parui, S.K. (eds) Neural Information Processing. ICONIP 2004. Lecture Notes in Computer Science, vol 3316. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30499-9_11
Download citation
DOI: https://doi.org/10.1007/978-3-540-30499-9_11
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-23931-4
Online ISBN: 978-3-540-30499-9
eBook Packages: Springer Book Archive