Sound-attenuated chamber system for measuring acoustic startle reflex responses in rodents with integrated transducer platform and dual-channel audio stimulation (100-20,000 Hz, 1-120 dB).
Director of Science · ConductScience
Ask Louise about Acoustic Startle Chamber fit, setup, configuration, or quote prep.
Already working with us? Sign in to connect this with My Scientist.
The Acoustic Startle Chamber provides a standardized platform for measuring startle reflex responses in rodents. The system features a sound-attenuated chamber with integrated transducer platform that converts vertical movement into voltage signals, enabling quantification of acoustic startle responses across a frequency range of 100-20,000 Hz at intensities from 1-120 dB. The dual-channel audio system supports white noise generation and custom sound file playback, while the removable grid platform accommodates both mouse and rat subjects with species-specific rod spacing configurations.
This apparatus enables researchers to conduct prepulse inhibition (PPI), fear-potentiated startle, and startle habituation protocols through the integrated Conductor Software. The system includes dual visible and IR lighting, Hz sound detection, and optional airpuff module integration. Platform capacity supports animals up to 500 grams, with transducer systems optimized for detecting movement responses in behavioral neuroscience applications.
The acoustic startle reflex operates through a rapid, involuntary motor response to sudden acoustic stimuli. When sound waves reach the auditory system, they trigger a brainstem-mediated reflex arc involving the cochlear nuclei, caudal pontine reticular nucleus, and spinal motor neurons. This pathway produces a characteristic whole-body startle response within 8-20 milliseconds of stimulus onset.
The chamber's transducer platform converts the vertical movement component of this startle response into a proportional voltage signal. Sound stimuli are delivered through calibrated speakers operating across the rodent hearing range (100-20,000 Hz), while the sound-attenuated environment eliminates external acoustic interference. The dual-channel system enables complex paradigms including prepulse inhibition, where a weak prepulse stimulus 30-500ms before the startle stimulus reduces response amplitude, providing a measure of sensorimotor gating function.
Response quantification occurs through real-time sampling of the transducer voltage output, capturing peak amplitude, response latency, and temporal dynamics of the startle response. The removable grid system provides consistent animal positioning while allowing natural movement, with species-specific rod spacing optimized for mouse (0.795 cm) and rat (0.978-1.4 cm) locomotor patterns.
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Audio Frequency Range | 100-20,000 Hz across dual independent channels | Entry-level systems often provide single-channel output with limited frequency range | Covers complete rodent hearing spectrum enabling complex auditory paradigms and species-specific stimulus optimization. |
| Platform Capacity | 0-500 gram capacity with voltage-converting transducer | Basic systems may have lower weight limits or less sensitive detection | Accommodates full range of adult rodent strains while maintaining sensitivity for detecting subtle movement responses. |
| Chamber Configurations | Species-specific chambers with removable grids (mouse: 0.795cm spacing, rat: 0.978-1.4cm spacing) | Fixed chamber designs often require compromise between species optimization | Optimizes stimulus delivery and animal positioning for both mouse and rat studies without cross-contamination concerns. |
| Sound Intensity Range | 1-120 dB calibrated intensity control | Lower-end systems may have limited intensity range or less precise calibration | Enables threshold testing and high-intensity startle paradigms with precise dose-response characterization. |
| Software Integration | Neuralynx and Ethovision compatibility with SMS/Email integration | Standalone systems often lack integration capabilities | Supports synchronized neural recording and behavioral tracking for comprehensive experimental analysis. |
| Stimulus Delivery Options | White noise generator plus custom sound file compatibility | Basic systems may be limited to standard tone delivery | Provides flexibility for novel experimental designs and specialized acoustic stimulus requirements. |
This acoustic startle system provides comprehensive stimulus control across the full rodent hearing spectrum with species-optimized chamber configurations and integrated software capabilities. The dual-channel audio system and voltage-converting transducer platform enable precise quantification of startle responses while supporting complex behavioral paradigms including prepulse inhibition and fear conditioning protocols.
| Model | SKU | Listed price | Status | Shipping box |
|---|---|---|---|---|
| 4 rat | ME-5826 | $32,360.00 | Available | 43.2 x 38.0 x 27.9 cm |
| 4 mouse | ME-5825 | $31,560.00 | Available | 66.04 x 66.04 x 55.88 cm |
| 1 mouse | ME-5821 | $7,990.00 | Available | 43.2 x 38.0 x 27.9 cm |
| 1 rat | ME-5822 | $8,190.00 | Available | 43.2 x 38.0 x 27.9 cm |
| 2 rat | ME-5824 | $16,280.00 | Available | 43.2 x 38.0 x 27.9 cm |
| 2 mouse | ME-5823 | $15,790.00 | Available | 43.2 x 38.0 x 27.9 cm |
Perform daily transducer calibration using known weights across the full 0-500g range before experimental sessions.
Why: Ensures consistent voltage-to-movement conversion and maintains measurement accuracy across experimental conditions.
Clean removable grid assemblies with mild detergent between subjects and allow complete drying before reassembly.
Why: Prevents cross-contamination and maintains consistent electrical conductivity for shock delivery protocols.
Allow 10-15 minute habituation period in the chamber before stimulus delivery to reduce handling-induced movement artifacts.
Why: Minimizes non-startle movements that can interfere with response quantification and improves signal-to-noise ratio.
Monitor baseline platform stability for 2-3 minutes before each session to identify potential transducer drift or environmental vibration.
Why: Ensures data quality by detecting technical issues that could affect response amplitude measurements.
If startle amplitudes appear inconsistent, verify speaker positioning and check for cable connection looseness in the transducer interface.
Why: Mechanical connections directly affect signal transmission and stimulus delivery consistency.
Always verify shock current settings are appropriate for species and protocol before beginning fear conditioning sessions.
Why: Prevents animal welfare issues and ensures stimulus intensity falls within established protocol parameters.
Use consistent ambient lighting conditions and minimize laboratory noise during testing sessions.
Why: Controls for environmental variables that can influence baseline anxiety levels and startle reactivity.
Document sound level measurements at the animal position using a calibrated sound meter for each experimental setup.
Why: Provides verification of acoustic stimulus delivery and supports protocol documentation for publication requirements.
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support for software configuration and protocol development. Extended warranty and calibration service options are available for laboratory validation requirements.
The Acoustic Startle Response Chamber is utilized in the assessment of underlying mechanisms of sensorimotor integration. The acoustic startle response is a protective reflex to a sudden or a threatening auditory stimulus often characterized by rapid closing of the eyes and muscle contractions. In animals, the startle response may be observed during a predator confrontation, and thus is also known as the escape response (Fetcho & McLean, 2009). The short pathways of the startle circuitry have relatively fast conducting neurons that are receptive to different sensory modalities. These pathways are, in turn, connected to the motor neurons, often the largest ones, which undergo strong excitation in response to the startle stimuli (Fetcho, & McLean, 2009). The startle response, hence, is useful in understanding cellular functions and synaptic connections.
While reflexive, the startle response may also be elicited by other sensory stimuli such as sensory gating (Fendt, Li, & Yeomans, 2001). Impairments of sensory gating, measured using pre-pulse inhibition, are often biomarkers of many neuropsychiatric disorders such as schizophrenia (Mena et al., 2016) and obsessive-compulsive disorder (Ahmari, Risbrough, Geyer, & Simpson, 2016). Impaired pre-pulse inhibition is also a characteristic of neurological disorders such as Huntington’s disease (Swerdlow et al., 1995) and Tourette syndrome (Zebardast et al., 2013). Thus, the acoustic startle response is helpful in assessing sensory gating impairments and development of the associated treatments. Additionally, the startle response can also be used to evaluate learning and emotions.
The Acoustic Startle Response Chamber consists of a sound-attenuated isolation chamber. The chamber comes equipped with an animal holder having a grid floor and transducer. The stimulus presentation can be done via speakers, visible light bulb, and shock grid attachment. The chamber can be calibrated using the Conductor Software. Other apparatuses used in the assessment of reflex and similar behaviors include the Step Down Avoidance, the Geotaxis Test, the Electrical von Frey Filament, and Predator Odor Exposure Test.
The Acoustic Startle Response Chamber consists of a sound-attenuated isolation chamber with provisions for the animal holder and startle-inducing cues. The animal holder is available in a range of sizes to accommodate animals ranging in weight from 0 to 500 grams. The holder is constructed using metal rods that have a diameter of 0.47 cm (flooring) and 0.318 cm (sides) that are spaced according to the weight of the animal. The animal holder can also be fitted with a transducer to convert vertical movements of the platform into voltage signals. In addition to auditory stimuli, electrical as well as light stimuli can be presented in the Acoustic Startle Response Chamber. Auditory stimuli can be presented through the two speakers present in the chamber. The speakers allow two independent channels, each having a frequency range of 100 to 40,000 Hz and an intensity range of 1 to 150 dB. The chamber is also equipped with a sound detector to assist volume control. Light cues can be produced using the dual visible light and infrared bulbs. A removable DC current shock grid can also be used to provide electrical stimuli. The shock intensity can be raised in 0.1 mA steps between 0.1 to 4.0 mA.
Clean the Acoustic Startle Response Chamber and its components between trials and subjects to prevent the influence of any lingering stimuli on the performances. Calibrate the speaker volumes as well as the transducer sensitivity in the absence of any external disturbances before commencing with the protocol.
The general protocol can be divided into the acclimation phase, the habituation phase, and the pre-pulse inhibition phase. Throughout the session, white background noise is maintained.
Acclimation Phase
Acclimatize the subject to handling at least one week prior to beginning the sessions. Subjects that have undergone surgery should be allowed at least 1 week of rest to prevent surgery stress from interfering with the task.
Allow the subject to acclimatize to the testing room for at least 30 minutes without any stimulations. Weigh the subject before placing it in the apparatus and allow it to acclimatize to the apparatus with the background noise (65 to 68 dB white noise) on for 5 to 15 minutes.
Habituation Phase (Acoustic Startle Response Trials)
Following the acclimation phase, begin the habituation phase using only startle stimuli. Present the subject with 30 to 100 startle stimuli in the range of 105 to 120 dB having a duration between 20 to 40 msec. Though debated, it is recommended that the intertrial interval between the startle stimuli be randomized between 10 to 30 sec to prevent the possible prediction of the timing of the stimuli by the subject. However, fixed intervals may also be used.
Pre-pulse Inhibition Phase
Allow the subject 5 to 10 minutes acclimation period before beginning the pre-pulse inhibition phase. Begin the session with 4 to 5 successive bursts of startle pulse (120 dB for 40 msec) to normalize the subject response. Follow this trial with a pseudorandomized presentation of startle pulse, no stimulation and three distinct pre-pulse (for example 70, 75, and 80 dB for 20 msec) followed by startle pulse (after 30 or 100 msec). Perform at least 10 trials under each of the three conditions with inter-trials interval randomized between 10 to 30 sec (a fixed interval of 20 sec may also be used). A pre-pulse alone condition may also be included in the pre-pulse inhibition block.
Startle Threshold Trial
The startle threshold trial allows the establishment of the appropriate startle pulse and is usually performed following the habituation phase. Present each decibel in a randomized order for a 40 msec duration. Present at least 3 to 5 instances of each decibel and average it.
Long-Term Habituation Protocol
For long term habituation protocol, the general protocol (acclimation phase, habituation phase, and pre-pulse inhibition phase) are to be repeated over a course of at least 5 consequent days. It must be ensured that all conditions, including housing and timing of the experiment, are maintained across all days with very little variability.
The long-term habituation assessment can also be performed only with the acclimation phase and the habituation phase, with the habituation phase having at least 100 startle pulse used.
In addition to the observation of behavioral reactions, the following data can be recorded in the Acoustic Startle Inhibition Chamber,
%PPI = [pulse-alone – (pre-pulse + pulse score)]/pulse-alone score
Strength
The Acoustic Startle Response Chamber allows the automation of the entire process. The apparatus allows control over the intensity and combinations of cues used. The all-in-one nature of the apparatus permits the application of various protocols such as fear-potentiated startle. The system can also be used to induce stress in subjects as part of the protocol of other behavioral assays.
Limitations
Behavioral performances of the subjects may be affected by changes in illumination and noise levels in the holding area from the housing conditions. Any variations in the isolation chamber conditions, such as background noise, from trial to trial may result in erroneous data. Improper calibration of the components of the apparatus may affect the quality of the data. Lingering olfactory cues or other cues from previous trials may influence performances. Subjects age, gender, weight, species, and sensitivity to the cues used can impact performances.
From the Maze Engineers documentation for this apparatus.
What is the temporal resolution for measuring startle response onset and peak amplitude?
The transducer system converts movement to voltage signals in real-time, enabling detection of startle responses within the typical 8-20ms onset latency range. Consult product datasheet for specific sampling rate and temporal resolution specifications.
Can the system deliver multiple prepulse stimuli with varying interstimulus intervals?
Yes, the dual-channel audio system and Conductor Software support complex prepulse inhibition paradigms with programmable stimulus timing, intensity, and frequency parameters across the 100-20,000 Hz range.
How does the chamber accommodate different rat strains with varying body sizes?
The system includes small rat chambers (16.5 x 6.09 x 5.08 cm) and large rat chambers (16.5 x 8.1 x 9.1 cm) with corresponding grid rod spacing of 0.978 cm and 1.4 cm respectively, supporting rats up to 500g capacity.
What background noise levels are achieved in the sound-attenuated chamber?
The sound attenuation chamber provides acoustic isolation for controlled stimulus delivery, though specific background noise specifications should be confirmed in the product datasheet.
Can the system integrate with electrophysiological recording equipment?
Yes, the system offers Neuralynx integration capabilities for synchronized neural recording during startle testing, enabling correlation of behavioral responses with neural activity.
What data output formats are supported for statistical analysis?
The Conductor Software exports data in standard formats compatible with statistical analysis packages, including response amplitude, latency, and temporal dynamics measurements.
How frequently does the transducer platform require recalibration?
Calibration frequency depends on usage intensity and environmental conditions. Regular validation with known weights across the 0-500g range is recommended, particularly when measurement precision is critical for experimental outcomes.
Can foot shock be delivered through the grid floor for fear conditioning protocols?
Yes, the system includes DC current delivery from 0.1-4.0 mA in 0.1 mA steps through the removable grid system, enabling fear conditioning and fear-potentiated startle paradigms.
ConductVision is our video-tracking software. Record your sessions on video, and it reports the measures listed below.
This test needs the Advanced Rodent Module, an add-on to the ConductVision license.
A 5-year license is $3,990 in total.
The Advanced Rodent Module runs on this license. On its own, the license scores standard tests such as the open field, the elevated plus maze, the Y-maze and the Morris water maze. Results export as CSV files.
A 5-year module license is $3,990 in total, the same as the 5-year base license.
Send it over and we'll email you a personalized answer — no call, no scheduling.
Prefer to talk it through?
Creator Insights
Howard S. Hoffman and James R. Ison published a landmark 1980 Psychological Review paper that synthesized decades of work on the acoustic startle reflex and its modification. Their framework established the concepts behind prepulse inhibition — the reduction in startle amplitude when a weak stimulus precedes the startling one — and explained how the nervous system uses background input to gate reflexes. Although the startle response had been described in the 1930s and Ison’s laboratory had been accumulating data since the early 1970s, the Hoffman & Ison (1980) paper became the dominant theoretical and methodological anchor for acoustic startle chambers. Prepulse-inhibition deficits in rodents are now a major translational model of sensorimotor gating in schizophrenia and related disorders.
To view Howard S. Hoffman’s publications, visit PubMed.
Did you work with Howard S. Hoffman? to suggest corrections or share material for these Creator Insights.
ConductScience celebrates method creators: researchers who, through rigorous and often ingenious experiments, develop the tools that reveal how the brain and body work. These are real scientific discoveries that become everyday instruments for the labs that follow.
Use this apparatus with
No exact ConductVision acoustic-startle page is currently published. Startle amplitude is normally read from the load-cell transducer under the animal enclosure rather than overhead tracking; keep this as a roadmap gap.
Supporting page not yet builtNo exact ConductMaze acoustic-startle protocol page is currently published. Pulse and prepulse trial blocks and inter-trial intervals are normally configured on the startle controller; keep this as a roadmap gap.
Supporting page not yet builtSummarize startle amplitude, prepulse inhibition, within-session habituation, and startle latency with quality-control flags.
Acoustic Startle Analyzer ->Configuration considerations
Use these notes to scope species, cohort, tracking, and automation needs. Only verified product or support routes are linked from this section.
Sound-attenuating cabinet with animal enclosure on a load-cell platform, speaker, and calibration microphone
Standard configuration for startle and prepulse inhibition, recording reflex amplitude to pulse-alone trials and the reduction produced when a weak prepulse precedes the pulse.
Quote
Request QuoteEnclosure size and transducer sensitivity scaled for mouse or rat body weight
Enclosure volume and transducer loading change measured amplitude, so the enclosure and sensitivity should match the species and body weight of the cohort being tested.
Quote
View options ->Extended pulse-block protocols with per-trial amplitude and latency logging
Best when the question is reflex plasticity or timing rather than gating, using repeated pulse blocks to quantify within-session habituation and startle latency.
Quote
Request automation help§ 1
The Acoustic Startle Chamber measures the whole-body startle reflex to a sudden loud sound and its modulation by a preceding weak stimulus. Koch reviewed the startle circuit as a fast, well-defined sensorimotor reflex whose amplitude can be read continuously from a load-cell transducer under the animal. 1
When a weak non-startling prepulse precedes the startle pulse, the reflex is reduced, a phenomenon called prepulse inhibition (PPI) that indexes sensorimotor gating. The startle and PPI circuitry has been mapped in detail in the rat, making the chamber a standard assay of gating and reflex plasticity. 1
Background noise, transducer loading by body weight, stimulus calibration in decibels, within-session habituation, and strain hearing ability all change amplitude and PPI independent of gating. A defensible protocol calibrates stimuli with a microphone, fixes background level, blocks habituation trials, and reports body weight and strain. 1
§ 2
Calibrated pulse-alone and prepulse-plus-pulse trial blocks with amplitude, PPI, and habituation scoring under a fixed background level.
Critical methodological constraints
Core startle-chamber endpoints for reflex magnitude, sensorimotor gating, plasticity, and timing, with a no-stimulus quality-control trial.
Startle Amplitude
Reflex magnitude
Prepulse Inhibition (PPI)
Sensorimotor gating
Startle Habituation
Plasticity
Startle Latency
Reflex timing
No-Stimulus Baseline
Quality control
+ Additional metrics: per-prepulse PPI, percent habituation across blocks, body weight, strain, background level, calibration values, and per-session apparatus notes.
A compact fraction of the startle reflex that was suppressed by the prepulse.
Estimate the N per group needed to detect a literature-anchored startle or gating effect at the endpoint you plan to report. Override the defaults with your own pilot numbers.
§ 3
PubMed publication counts, sample apparatus output, and recent papers from a dated PubMed snapshot.
PubMed volume and co-occurring behavioral methods for acoustic-startle and prepulse-inhibition studies.
Representative output from a startle-plus-PPI session under a fixed background level.
A tube-restriction test: A candidate impulsivity-related assay based on nose-poke behavior dynamics.
Zhang Y, Huang H, Huang Y, et al.. J Neurosci Methods. 2026 Sep 23.
Impulsivity is a multidimensional endophenotype, yet current rodent assays require prolonged training, dietary restriction, or yield binary outcomes. We developed the tube-restriction test (TRT) as a complementary assay to exploit innate approach-avoidance conflict.
The early postnatal maternal environment influences prepulse inhibition and brain one-carbon metabolites in male mice.
Maekawa M, Wang H, Kirikae H, et al.. Physiol Behav. 2026 Sep 19.
Maternal nutritional environments during early development are thought to influence neurodevelopmental and psychiatric disease susceptibility.
Everolimus Attenuates Salicylate-Induced Tinnitus-Like Behavior and Auditory Cortical Hyperexcitability.
Fan B, Liu Y, Cao W, et al.. Drug Des Devel Ther. 2026.
Tinnitus is an auditory perception without external stimuli, driven by maladaptive neuroplasticity.
Light exposure disrupts sensorimotor gating and modulates acute stress effects in Wistar rats.
Santos-Carrasco D, De la Casa LG. Behav Brain Res. 2026 Sep 13.
Prepulse inhibition (PPI) of the acoustic startle response is a robust index of sensorimotor gating that is sensitive to emotional and environmental factors, yet the effects of acute stress on PPI in rats remain inconsistent.
Motor coordination and behavioural deficits in a mouse model of KMT2B-related dystonia.
Harrer P, Kranz A, Becker L, et al.. Neurobiol Dis. 2026 Sep 11.
Pathogenic variants in KMT2B cause early-onset dystonia, but a mouse model that has undergone comprehensive, dystonia-oriented phenotyping is lacking.
Ovariectomy reverses maternal immune activation-induced deficits in dopamine and NMDA receptor-mediated regulation of prepulse inhibition in female Long-Evans rats.
van den Buuse M, Sbisa A, Gogos A. Schizophr Res. 2026 Sep 7.
We studied the role of ovarian steroid hormones in the poly(I:C) maternal immune activation model of schizophrenia in rats. Pregnant Long-Evans rats were injected IV with 4 mg/kg of poly(I:C) on gestational day 15.
§ 4
Limitations of the paradigm, methodological caveats, and current directions.
Variables that can shift Acoustic Startle Chamber results apart from the effect under study.
The fixed background sets the contrast for both pulse and prepulse. Drift or differences in background level change amplitude and PPI independent of the manipulation.
Body weight loads the load-cell platform and shifts measured amplitude, so raw amplitudes are not comparable across groups that differ in mass.
Uncalibrated pulse and prepulse intensities make amplitude and PPI incomparable across chambers and sessions. Calibrate in decibels at the animal position.
Startle declines across a session through habituation, so where a trial sits in the block changes its amplitude. Separate baseline blocks from later ones.
Strains with hearing loss show low startle and PPI for reasons unrelated to gating. Confirm hearing in the strain before interpreting low values.
## Acoustic Startle Chamber — methods controls Confounds controlled in this protocol: - **Background noise level.** The fixed background sets the contrast for both pulse and prepulse. Drift or differences in background level change amplitude and PPI independent of the manipulation. - **Transducer and body-weight loading.** Body weight loads the load-cell platform and shifts measured amplitude, so raw amplitudes are not comparable across groups that differ in mass. - **Stimulus calibration (dB).** Uncalibrated pulse and prepulse intensities make amplitude and PPI incomparable across chambers and sessions. Calibrate in decibels at the animal position. - **Within-session habituation.** Startle declines across a session through habituation, so where a trial sits in the block changes its amplitude. Separate baseline blocks from later ones. - **Strain hearing ability.** Strains with hearing loss show low startle and PPI for reasons unrelated to gating. Confirm hearing in the strain before interpreting low values.
The startle chamber is strongest when stimulus intensities, background level, trial structure, and body weight are calibrated and reported before testing. A single PPI value is a screening signal; a gating effect is most defensible when PPI is interpreted relative to baseline startle amplitude and habituation in the same cohort, with strain hearing confirmed. 1
PPI is a percent reduction from the pulse-alone baseline. A very low or saturated startle amplitude makes the PPI ratio unstable, so PPI should always be read alongside the baseline amplitude that produced it.
Confirm intact hearing in the strain, for example with a hearing screen, before comparing startle and PPI. Strains with hearing loss show low values for reasons unrelated to sensorimotor gating.
Yes. Run an initial pulse-alone block for baseline amplitude and treat the decline across later blocks as habituation, so within-session plasticity is not read as a group difference in reflex magnitude.
Quarterly editorial review of emerging Acoustic Startle Chamber methodology. Q2 2026
Calibrating pulse and prepulse intensities at the animal position across rigs improves comparability of amplitude and PPI between labs and chamber models.
Software logging of per-trial amplitude and latency captures habituation and no-stimulus baselines consistently and reduces manual scoring.
Reporting body weight, strain, and hearing status is increasingly expected because each changes raw startle and PPI independent of gating.
Startle and PPI are paired with attention and arousal assays to anchor sensorimotor gating within a broader behavioral battery in one cohort.
§ 5
6 selected methods and validation references for Acoustic Startle Chamber.
