Delay-tuned neurons in the inferior colliculus of the mustached bat: implications for analyses of target distance.

Title

Delay-tuned neurons in the inferior colliculus of the mustached bat: implications for analyses of target distance.

Creator

Portfors C V; Wenstrup J J

Publisher

Journal of neurophysiology

Date

1999
1999-09

Description

We examined response properties of delay-tuned neurons in the central nucleus of the inferior colliculus (ICC) of the mustached bat. In the mustached bat, delay-tuned neurons respond best to the combination of the first-harmonic, frequency-modulated (FM1) sweep in the emitted pulse and a higher harmonic frequency-modulated (FM2, FM3 or FM4) component in returning echoes and are referred to as FM-FM neurons. We also examined H1-CF2 neurons. H1-CF2 neurons responded to simultaneous presentation of the first harmonic (H1) in the emitted pulse and the second constant frequency (CF2) component in returning echoes. These neurons served as a comparison as they are thought to encode different features of sonar targets than FM-FM neurons. Only 7% of our neurons (14/198) displayed a single excitatory tuning curve. The rest of the neurons (184) displayed complex responses to sounds in two separate frequency bands. The majority (51%, 101) of neurons were facilitated by the combination of specific components in the mustached bat's vocalizations. Twenty-five percent showed purely inhibitory interactions. The remaining neurons responded to two separate frequencies, without any facilitation or inhibition. FM-FM neurons (69) were facilitated by the FM1 component in the simulated pulse and a higher harmonic FM component in simulated echoes, provided the high-frequency signal was delayed the appropriate amount. The delay producing maximal facilitation ("best delay") among

Subject

Animal/physiology; Animals; Chiroptera/*physiology; Echolocation/*physiology; Inferior Colliculi/cytology/*physiology; Neural Inhibition/physiology; Neurons/*physiology; Reaction Time/physiology; Vocalization

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

1326–1338

Issue

3

Volume

82

Citation

Portfors C V; Wenstrup J J, “Delay-tuned neurons in the inferior colliculus of the mustached bat: implications for analyses of target distance.,” NEOMED Bibliography Database, accessed September 17, 2021, https://neomed.omeka.net/items/show/4683.

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