Noise Exposure
Objective: To determine whether noise-induced cochlear neuropathy results in abnormal auditory behavior by measuring acoustic startle response (ASR) and prepulse inhibition (PPI) in mice exposed to neuropathic versus nonneuropathic noise intensity
This is a Noise Exposure protocol using mouse as the model organism. The procedure involves 6 procedural steps, 4 equipment items. Extracted from a 2013 paper published in Journal of Neurophysiology.
Model and subjects
mouse • Not specified in provided text • unknown • Not specified in provided text • Not specified in provided text
Study window
Estimated timing pending
Core workflow
Divide mice into experimental groups • Expose mice to noise • Measure Acoustic Startle Response (ASR)
Primary readouts
- Acoustic Startle Response (ASR) magnitude
- Prepulse Inhibition (PPI) levels
- Gap detection ability via Gap PPI tests
- Auditory Brainstem Response wave 1 amplitude
Key equipment and reagents
Use this page as an execution guide, then fall back to the source paper whenever you need exact exclusions, dosing details, or assay-specific caveats.
Confirm first
- Verify the animal model, intervention setup, and collection timepoints against the source paper.
- Check that every direct vendor link matches the exact specification your lab plans to run.
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- Work through the protocol steps in order and use the inline vendor chips only when you need to source or verify an item.
- Jump to Experimental Context for readouts, data shape, and analysis flow before planning downstream analysis.
Protocol Steps
Start here. The step list is optimized for running the experiment, with direct vendor links available inline when you need to source a cited item.
Divide mice into experimental groups
Assign mice to three groups: unexposed control mice, mice to receive neuropathic noise exposure, and mice to receive nonneuropathic noise exposure
Note: Neuropathic noise is higher intensity; nonneuropathic noise is lower intensity
View evidence from paper
“Responses were measured in mice exposed either to a neuropathic noise or to a lower-intensity, nonneuropathic noise and in unexposed control mice”
Expose mice to noise
Expose designated mice to either neuropathic or nonneuropathic intensity noise. Neuropathic noise exposure causes immediate, permanent degeneration of cochlear nerve with complete threshold recovery and lack of hair cell damage. Nonneuropathic noise is lower intensity.
Note: Neuropathic noise causes cochlear neuropathy; nonneuropathic noise does not
View evidence from paper
“a neuropathic noise exposure can cause immediate, permanent degeneration of the cochlear nerve despite complete threshold recovery and lack of hair cell damage”
Measure Acoustic Startle Response (ASR)
Measure acoustic startle response in all three groups of mice (control, neuropathic-exposed, nonneuropathic-exposed) to assess hyperresponsivity to sound
Note: Mice with cochlear neuropathy displayed enhanced ASR compared to controls
View evidence from paper
“Mice with cochlear neuropathy displayed hyperresponsivity to sound, evidenced by enhanced ASR and PPI, while exposed mice without neuronal loss showed controllike responses”
Measure Prepulse Inhibition (PPI)
Measure prepulse inhibition of startle in all three groups of mice to assess auditory processing and potential tinnitus presence
Note: Enhanced PPI observed in mice with cochlear neuropathy; used to assess tinnitus
View evidence from paper
“Mice with cochlear neuropathy displayed hyperresponsivity to sound, evidenced by enhanced ASR and PPI, while exposed mice without neuronal loss showed controllike responses”
Perform Gap PPI tests
Conduct gap detection tests using prepulse inhibition paradigm to assess potential tinnitus filling in the gap phenomenon
Note: Limited gap detection deficits observed only for certain gap-startle latencies in mice with cochlear neuropathy, inconsistent with tinnitus filling in the gap
View evidence from paper
“Gap PPI tests, often used to assess tinnitus, revealed limited gap detection deficits in mice with cochlear neuropathy only for certain gap-startle latencies”
Record Auditory Brainstem Response (ABR)
Measure auditory brainstem response including wave 1 (representing cochlear nerve activity) and later peaks (representing brainstem activity) in all groups
Note: Wave 1 significantly reduced in neuropathic-exposed mice; later peaks unchanged or enhanced, suggesting compensatory neural hyperactivity
View evidence from paper
“Despite significantly reduced wave 1 of the auditory brainstem response, representing cochlear nerve activity, later peaks were unchanged or enhanced, suggesting compensatory neural hyperactivity in the auditory brainstem”