Document Detail

Effect of acoustic stimulus characteristics on the startle response in hooded rats.
MedLine Citation:
PMID:  9519548     Owner:  NLM     Status:  MEDLINE    
The acoustic startle response (ASR) depends on stimulus parameters such as duration, intensity and particularly on the stimulus rise time. The aim of our study was to determine to what extent the ASR parameters are affected by the spectral characteristics of the stimulus. Therefore, in this experiment the amplitude and the latency of the acoustic startle reflex were assessed for a fixed pulse duration and for a variety of stimulus frequencies ranging between 3 and 23 kHz. The ASRs were studied in 11 adult hooded rats exposed to 2-ms (120 dB SPL) tone pulses of different frequencies presented in random order, with or without 70 dB white noise background. Statistical analysis of the data revealed significant differences between ASR amplitudes for different frequencies. In our experimental situation the rats responded more readily to a low frequency stimulus. The startle amplitude decreased with tonal frequencies and distinguishable difference were seen for 3, 7, and 10 kHz pulses. However, such differences were not readily observed for higher frequencies i.e. 15, 20, 23 kHz. The same pattern of differences was observed when the acoustic stimulus was presented with the white noise background. The observed differences may be attributed, firstly, to a spectral characteristic of the stimulus and thus to an audibility in rats and secondly to a behavioral meaning of a stimulus of a different frequency.
J W Błaszczyk; K Tajchert
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta neurobiologiae experimentalis     Volume:  57     ISSN:  0065-1400     ISO Abbreviation:  Acta Neurobiol Exp (Wars)     Publication Date:  1997  
Date Detail:
Created Date:  1998-04-13     Completed Date:  1998-04-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1246675     Medline TA:  Acta Neurobiol Exp (Wars)     Country:  POLAND    
Other Details:
Languages:  eng     Pagination:  315-21     Citation Subset:  IM    
Department of Neurophysiology, Nencki Institute of Experimental Biology, Warsaw, Poland.
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MeSH Terms
Acoustic Stimulation
Auditory Pathways / physiology*
Behavior, Animal / physiology
Rats, Inbred Strains
Startle Reaction / physiology*

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