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Ontogeny of the acoustic startle response in C57BL/6J mouse pups
Insights
The acoustic startle response in young mice (12-17 days) develops rapidly, with higher frequencies and lower intensities becoming more effective stimuli. This auditory system maturation parallels neurophysiological changes in the developing mouse pup.
Area of Science:
- Neuroscience
- Auditory Development
- Animal Behavior
Background:
- The development of auditory processing is crucial for survival and communication in mammals.
- Understanding the ontogeny of auditory reflexes provides insights into the maturation of the auditory system.
Purpose of the Study:
- To investigate the developmental trajectory of acoustic startle behavior in C57BL/6J mice.
- To correlate behavioral auditory responses with known neurophysiological development in the mouse pup auditory system.
Main Methods:
- A cross-sectional study design was employed.
- Acoustic startle responses were measured in mice aged 12 to 17 days.
- Mice were exposed to pure tones of varying frequencies (5-20 kHz) and intensities (80-100 dB SPL).
Main Results:
- Acoustic startle response incidence and latency were recorded.
- Higher frequency and lower intensity tones became more effective in eliciting the startle response with age.
- Startle latency decreased, and response sensitivity to frequency and intensity increased from 12 to 17 days of age.
Conclusions:
- The acoustic startle response in mice undergoes rapid ontogenetic development between 12 and 17 days of age.
- This behavioral maturation aligns with the neurophysiological development of the mouse pup auditory system.
- The findings highlight the critical period of auditory system development in early life.
Abstract:
A cross-sectional design was used to study the development of acoustic startle behavior in C57BL/6J mice from the approximate onset of hearing (12 days) to 17 days of age. Startle incidence and latency were recorded in response to 5-, 7-, 10-, 15-, and 20-kHz tones each presented at 80, 90, and 100 dB (SPL). From 12 to 17 days of age, higher frequency and lower intensity tones became increasingly effective in eliciting the acoustic startle response. In addition, startle latency decreased substantially, and response incidence became more sensitive to changes in tone intensity and tone frequency. This rapid ontogeny of the acoustic startle response closely parallels previously demonstrated neurophysiological development of the mouse pup auditory system.