Related Experiment Video
Updated: Dec 22, 2025
Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
Published on: September 1, 2011
Multi-sensory (auditory and somatosensory) pre-pulse inhibition in mice
Anna Louthan1, Lincoln Gray2, Mark L Gabriele2
1EVMS Hearing & Balance Center, Norfolk, VA.
Abstract:
We investigated the perception of two mechanoreceptive modalities alone and in combination: main effects and interaction between auditory and somatosensory stimulation in mice. Fifteen C57BL/6J mice between the ages of 1 and 6 months were tested three times each. Experimental design roughly followed published procedures using pre-pulse inhibition (PPI) of the acoustic startle response, except pre-pulses included vibration of the test chamber as well as soft sounds. Auditory pre-pulses were 80 dB broadband noises of 4, 9, 25, or 45 ms duration. Vibrations were of the same duration but of different frequencies (500, 460, 360, and 220 Hz). Pre-pulse inhibition increased with duration of the auditory pre-pulses, as expected. There was significant PPI to some but not all vibrotactile pre-pulses. Multimodal PPI was approximately additive (no significant auditory-by-somatosensory interaction). PPI increased more with age to somatosensory than to auditory pre-pulses. Future studies of multi-modal psychophysics in various mouse mutants could lend support to more mechanistic studies of neural specificity and possibly autism, tinnitus, and PTSD.
Insights
This study explored how mice perceive sound and touch together. Multimodal sensory input showed an additive effect, with age impacting touch perception more than sound perception.
Area of Science:
- Neuroscience
- Sensory Perception
- Auditory and Somatosensory Systems
Background:
- Investigating sensory integration is crucial for understanding complex behaviors.
- Pre-pulse inhibition (PPI) is a standard measure for sensory processing.
- Few studies have examined the combined effects of auditory and somatosensory stimuli.
Purpose of the Study:
- To investigate the main effects and interaction of auditory and somatosensory stimulation on pre-pulse inhibition in mice.
- To determine how different durations and frequencies of auditory and vibrotactile stimuli affect PPI.
- To explore the influence of age on multimodal sensory perception.
Main Methods:
- Utilized a pre-pulse inhibition (PPI) paradigm with acoustic startle response in C57BL/6J mice.
- Auditory pre-pulses varied in duration (4-45 ms) and intensity (80 dB).
- Vibrotactile pre-pulses varied in frequency (220-500 Hz) and duration (4-45 ms).
Main Results:
- Pre-pulse inhibition increased with the duration of auditory stimuli.
- Significant PPI was observed for some, but not all, vibrotactile stimuli.
- Multimodal PPI was approximately additive, indicating no significant interaction between auditory and somatosensory stimuli.
- PPI showed a greater increase with age for somatosensory stimuli compared to auditory stimuli.
Conclusions:
- Auditory and somatosensory stimuli contribute additively to pre-pulse inhibition.
- Age differentially affects the processing of auditory and somatosensory stimuli.
- This research provides a foundation for studying sensory processing deficits in neurological conditions.
