The role of frequency, phase and time for processing of amplitude modulated signals by grasshoppers.

The role of frequency, phase and time for processing of amplitude modulated signals by grasshoppers. Research Abstract Details 

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The role of frequency, phase and time for processing of amplitude modulated signals by grasshoppers. Abstract Text:

A Schmidt,B Ronacher,R M Hennig,

Acoustic signals consist of pressure changes over time and can thus be analyzed in the frequency- or in the time-domain. With behavioural experiments we investigated which frequency components (FC) are necessary for the recognition of the periodic envelope of the conspecific song by females of the grasshopper Chorthippus biguttulus. Further, we determined up to which frequency component phase information is required which would indicate processing in the time domain. Responses of females revealed that signals composed of FC between 10 and 50 Hz are sufficient for recognition of the song envelope. A systematic reduction in the number of FC showed that no single frequency component was required; signals without the fundamental frequency were still highly attractive and only three FC may be sufficient for song recognition. Phase changes for frequencies up to 40 Hz strongly changed the attractiveness of song signals but only little at 50 Hz. Females were also tested with rectangular signals in which pause duration was varied. Evidently, and despite the high attractiveness of song signals with a "missing fundamental", females evaluated the attractiveness of signals in the time-domain, since the selectivity for pause duration predicted the responses to signals composed from FC well.

The role of frequency, phase and time for processing of amplitude modulated signals by grasshoppers. Publishing Authors By Initials

A Schmidt,B Ronacher,RM Hennig,

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The role of frequency, phase and time for processing of amplitude modulated signals by grasshoppers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of comparative physiology. A, Neuroetholog

VOLUME: 194

Page Numbers: 221-33

Journal Abbreviation: J. Comp. Physiol. A Neuroethol

ISSN: 0340-7594

DAY: 28

MONTH: 11

YEAR: 2007

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LANGUAGE: eng

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Grant and Affiliation Information for The role of frequency, phase and time for processing of amplitude modulated signals by grasshoppers.

AFFILIATION: Behavioural Physiology Group, Department of Biology, Humboldt-Universität zu Berlin, Invalidenstr. 43, 10115, Berlin, Germany.

Country: Germany

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MEDLINETA: J Comp Physiol A Neuroethol Se

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