Sound-evoked oscillation and paradoxical latency shift in the inferior colliculus neurons of the big fruit-eating bat, <Emphasis Type="Italic">Artibeus jamaicensis</Emphasis> |
| |
Authors: | Julio C Hechavarría Ariadna T Cobo Yohami Fernández Silvio Macías Manfred Kössl Emanuel C Mora |
| |
Institution: | 1.Department of Animal and Human Biology,University of Havana,Havana,Cuba;2.Institut für Zellbiologie und Neurowissenschaft,Goethe-Universit?t,Frankfurt/Main,Germany |
| |
Abstract: | Frequency tuning, temporal response pattern and latency properties of inferior colliculus neurons were investigated in the
big fruit-eating bat, Artibeus jamaicensis. Neurons having best frequencies between 48–72 kHz and between 24–32 kHz are overrepresented. The inferior colliculus neurons
had either phasic (consisting in only one response cycle at all stimulus intensities) or long-lasting oscillatory responses
(consisting of multiple response cycles). Seventeen percent of neurons displayed paradoxical latency shift, i.e. their response
latency increased with increasing sound level. Three types of paradoxical latency shift were found: (1) stable, that does
not depend on sound duration, (2) duration-dependent, that grows with increasing sound duration, and (3) progressive, whose
magnitude increases with increasing sound level. The temporal properties of paradoxical latency shift neurons compare well
with those of neurons having long-lasting oscillatory responses, i.e. median inter-spike intervals and paradoxical latency
shift below 6 ms are overrepresented. In addition, oscillatory and paradoxical latency shift neurons behave similarly when
tested with tones of different durations. Temporal properties of oscillation and PLS found in the IC of fruit-eating bats
are similar to those found in the IC of insectivorous bats using downward frequency-modulated echolocation calls. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|