Behavioral testing apparatus for assessing inhibitory avoidance learning and memory retention in rodents using step-down paradigm with configurable platforms and aversive conditioning.
Director of Science · ConductScience
Ask Louise about Step Down Avoidance fit, setup, configuration, or quote prep.
Already working with us? Sign in to connect this with My Scientist.
The Step Down Avoidance apparatus provides a controlled environment for assessing inhibitory avoidance learning and memory retention in rodents. This behavioral testing system implements the classic step-down paradigm, where animals learn to avoid descending from an elevated platform to escape aversive stimuli. The apparatus features dual platform configurations (7cm and 11cm) with an electrified grid floor system delivering controlled shock parameters.
Constructed from transparent acrylic and stainless steel components, the system includes integrated vibrator and shocker modules for multi-modal aversive conditioning protocols. The removable grid floor design with 0.3cm diameter bars spaced 0.8-1cm apart ensures consistent shock delivery across the chamber floor. Available contextual plates (striped, chessboard, grey, white, black) enable environmental conditioning studies and context-dependent memory assessments.
The Step Down Avoidance test exploits the natural tendency of rodents to explore elevated surfaces while avoiding aversive stimuli. During the acquisition phase, animals are placed on the elevated platform and receive an electric shock upon stepping down to the grid floor. This creates an association between the platform descent behavior and the aversive stimulus, establishing inhibitory avoidance learning.
The apparatus delivers controlled electrical stimulation through the stainless steel grid floor at 45-60V DC with 1 Hz frequency and 0.5 second duration pulses. The shock parameters activate nociceptors without causing tissue damage, creating sufficient aversive motivation for learning. The vibrating platform capability adds tactile stimulation that can enhance the conditioning protocol or serve as an additional cue modality.
Memory assessment occurs through retention testing, where animals are returned to the apparatus and their latency to step down is measured. Increased step-down latency indicates successful memory consolidation and retention of the avoidance response. The dual platform sizes (7cm and 11cm) allow protocol adaptation for different species and experimental requirements.
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Platform Configuration | Dual platform system with 7cm and 11cm options plus square and circular configurations | Single fixed platform size limiting experimental flexibility | Enables species-specific optimization and protocol adaptation for different behavioral requirements. |
| Contextual Environment Control | Five distinct contextual plates (striped, chessboard, grey, white, black) | Plain chamber walls without environmental pattern variation | Supports context-dependent memory studies and environmental conditioning protocols. |
| Stimulus Modalities | Integrated vibrator and electrical shock with precise timing control | Single aversive stimulus modality with basic timing | Enables multi-modal conditioning protocols and enhanced stimulus discrimination learning. |
| Software Integration | Neuralynx, Ethovision, SMS and Email integration support | Limited or no automated data collection capabilities | Facilitates automated experiments and synchronization with neurophysiological recordings. |
| Grid Floor Design | Removable stainless steel grid with 0.3cm bars spaced 0.8-1cm apart | Fixed floor systems with limited cleaning access | Ensures consistent shock delivery while enabling thorough cleaning between subjects. |
This Step Down Avoidance system provides comprehensive behavioral testing capabilities with dual platform configurations, multi-modal stimulus delivery, and extensive software integration. The contextual environmental control and precision stimulus parameters support both basic avoidance learning studies and complex memory consolidation research protocols.
| Model | SKU | Listed price | Status | Dimensions |
|---|---|---|---|---|
| Rat | ME-6007 /ME-6008 | $6,490.00 | Available | 43.2 x 38.0 x 27.9 cm |
| Mouse | ME-6007 /ME-6008 | $5,990.00 | Available | 43.2 x 38.0 x 27.9 cm |
| Rat | ME-6008 | $6,490.00 | Available | 43.2 x 38.0 x 27.9 cm |
| Mouse | ME-6007 | $5,990.00 | Available | 43.2 x 38.0 x 27.9 cm |
Verify shock intensity using a digital multimeter before each experimental session to ensure consistent 45-60V DC delivery.
Why: Voltage drift can affect conditioning efficacy and introduce variability between subjects.
Clean the removable grid floor with 70% ethanol between subjects and inspect bar connections weekly.
Why: Residual odors can influence behavior while loose connections cause inconsistent stimulus delivery.
Allow 24-48 hours between acquisition and retention testing to assess memory consolidation.
Why: This interval permits evaluation of long-term memory formation rather than immediate performance effects.
If animals fail to show avoidance learning, verify grid bar spacing is uniform at 0.8-1cm intervals.
Why: Uneven spacing creates areas where animals can avoid shock without learning the avoidance response.
Record ambient lighting conditions and maintain consistent illumination across test sessions.
Why: Light levels affect rodent exploration behavior and can influence step-down latencies independent of learning.
Test shock intensity on an ohm meter before animal introduction and never exceed 60V DC output.
Why: Excessive voltage can cause tissue damage while insufficient voltage fails to establish proper conditioning.
Habituate animals to the platform for 2-3 minutes before conditioning to establish baseline exploration behavior.
Why: Initial platform familiarity reduces anxiety-related variables that could confound avoidance learning measurements.
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support for setup and protocol optimization throughout the warranty period.
What shock parameters are used for effective avoidance conditioning without tissue damage?
The system delivers 45-60V DC electrical stimulation at 1 Hz frequency with 0.5 second pulse duration. These parameters provide sufficient aversive motivation for learning while remaining within established safety limits for rodent behavioral studies.
How do I select the appropriate platform size for my experimental design?
The 7cm platform is typically used for mice and provides more challenging conditions requiring precise motor control, while the 11cm platform accommodates rats and allows easier platform maintenance behavior. Selection depends on species, age, and desired difficulty level.
Can the apparatus integrate with automated video tracking systems?
Yes, the system supports integration with Ethovision and other tracking software through the Conductor Science Software platform. The transparent acrylic construction enables clear behavioral observation and automated latency measurements.
What maintenance is required for the grid floor system?
The removable stainless steel grid floor should be cleaned with appropriate disinfectant between subjects and inspected regularly for proper electrical continuity. Bar spacing and alignment should be verified to maintain consistent 0.8-1cm spacing.
How does the contextual plate system work for environmental conditioning studies?
The five available plate designs (striped, chessboard, grey, white, black) can be installed to create distinct visual contexts. This enables studies of context-dependent memory where learning can be associated with specific environmental cues.
What data outputs are available for statistical analysis?
The system records step-down latencies, platform exploration time, and stimulus delivery timing. Integration with tracking software provides additional measures including locomotor activity patterns and spatial preference data.
How does this compare to other avoidance learning paradigms?
Step-down avoidance offers simpler protocols compared to active avoidance tasks while providing more controlled conditions than open-field aversive conditioning. The single-trial learning capability makes it particularly suitable for memory consolidation studies.
Send it over and we'll email you a personalized answer — no call, no scheduling.
Prefer to talk it through?
Enhance your setup with compatible accessories
Use this apparatus with
No exact ConductVision step-down-avoidance page is currently published. Retention latency and step-down events are normally captured by the platform timer and floor grid rather than overhead tracking; keep this as a roadmap gap.
Supporting page not yet builtPlatform habituation, training step-down with a calibrated foot-shock, retention-interval scheduling, and latency-capped retention-test scoring.
ConductMaze Passive Avoidance Protocol ->Summarize retention latency, training latency, step-down count, platform time, and locomotor activity with quality-control flags.
Active/Passive Avoidance Calculator ->Configuration considerations
Use these notes to scope species, cohort, tracking, and automation needs. Only verified product or support routes are linked from this section.
Grid-floor chamber with an elevated insulated platform and a calibrated scrambled foot-shock generator
Standard configuration for inhibitory-avoidance memory, scoring retention latency to step down from the safe platform onto the grid floor after a single training pairing.
Quote
Request QuotePlatform height and chamber footprint scaled for mouse or rat body size
Platform height and grid spacing change how readily an animal steps down, so the apparatus geometry should match the species and cohort being tested.
Quote
View options ->Platform-mounted load cell and floor-grid sensing with automated latency and step-down logging
Best when automated detection of platform descent is needed to remove observer timing variance and to log step-down events and latency continuously.
Quote
Request automation help§ 1
Step-Down Passive Avoidance measures inhibitory-avoidance memory by recording how long an animal withholds stepping off a safe elevated platform onto a grid floor where it previously received a brief foot-shock. Gold reviewed how single-trial step-down designs became a workhorse for studying memory storage and its modulation. 1
In training, the animal steps down from the platform and receives a brief calibrated foot-shock; at a later retention test the latency to step down again, capped at a ceiling, indexes consolidation of the aversive association. Izquierdo and Medina mapped the biochemical sequence in the hippocampus that this single-trial design helped reveal. 1
Foot-shock intensity, baseline locomotor activity, training step-down latency, retention interval, and handling stress all change retention latency independent of true memory. A defensible protocol calibrates and reports shock intensity, records training latency, fixes the retention interval, and standardizes handling across animals. 1
§ 2
Single-trial step-down training with a calibrated foot-shock and a latency-capped retention test at a fixed interval.
Critical methodological constraints
Core step-down passive-avoidance endpoints for memory consolidation and quality control.
Retention Latency
Memory consolidation
Training Latency
Baseline
Step-Down Count
Avoidance failures
Platform Time
Inhibition
Locomotor Activity
Confound quality control
+ Additional metrics: latency ceiling reached flag, body weight, retention interval, time of day, shock intensity, and per-trial apparatus notes.
A compact fraction of the latency ceiling that the animal withheld stepping down on the retention test.
Estimate the N per group needed to detect a literature-anchored memory 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 step-down passive-avoidance studies.
Representative output from a single-trial step-down test with a 300 s latency ceiling at a 24 h retention interval.
Degrees-of-Freedom Approximations for Conditional-Mean Inference in Random-Lot Stability Analysis.
Karl AT, Rushing H, Burdick RK, et al.. Pharm Stat. 2026.
Linear mixed models are widely used for pharmaceutical stability trending when sufficient lots are available.
Early discharge for low-risk pediatric febrile neutropenia: safe only in selected centers.
Dinç O. Pediatr Hematol Oncol. 2026 Sep.
Marathe et al. report encouraging results from a step-down pathway for low-risk fever and neutropenia in pediatric and adolescent-young adult oncology patients, with reduced hospitalization and no sepsis or infection-related mortality. Their work is an important contribution to risk-adapted supportive care.
Septic arthritis due to Corynebacterium striatum in native joints: a systematic review of published cases.
Posada SR, Zamora PC, López LP, et al.. Diagn Microbiol Infect Dis. 2026 Sep.
Corynebacterium striatum has traditionally been regarded as a skin commensal and is frequently dismissed as a contaminant when isolated from clinical samples. However, it has increasingly been recognized as an opportunistic pathogen in selected clinical settings.
Sex-dependent therapeutic effects of nano-curcumin on alzheimer's disease: enhanced cognitive and physiological restoration in female mice.
Rodrigues KDC, Oliveira MDC, de Souza IC, et al.. Psychopharmacology (Berl). 2026 Sep.
Curcumin (Cur) is a bioactive compound with neuroprotective and anti-inflammatory effects, though its clinical application is limited by poor bioavailability.
Gantry-period-guided modulation factor selection in helical tomotherapy: effects on delivery efficiency, dosimetry and verification accuracy.
Jin X, Gao T, Liu X, et al.. Front Oncol. 2026.
To explore a gantry-period-guided strategy for identifying a lower useful modulation factor (MF) in helical tomotherapy under fixed field width and pitch. Twenty previously treated cases from head, head-and-neck, abdomen and pelvis were replanned with a field width of 2.5 cm and a pitch of 0.287.
A Selective Cortico-Limbic Network Organizes Behavior During Reward Seeking Under Threat.
Sierra RO, Ramirez-Lugo L, Illescas-Huerta E, et al.. J Neurosci Res. 2026 Aug.
To obtain rewards, animals must select actions while facing threats, often under competing appetitive and defensive drives and with uncertainty about harm.
§ 4
Limitations of the paradigm, methodological caveats, and current directions.
Variables that can shift Step-Down Passive Avoidance results apart from the effect under study.
Retention latency scales with shock intensity. Without a calibrated and reported intensity, group differences can reflect the conditioning stimulus rather than memory.
A generally hypoactive animal steps down less often, inflating retention latency independent of memory. Report locomotor activity as a check.
A long pre-shock training latency confounds retention. Record training latency and consider a cutoff for animals that fail to step down.
Consolidation depends on the delay between training and test. A variable retention interval mixes consolidation states across animals.
Inconsistent handling adds stress that alters step-down behavior. Standardize handling, placement, and timing across the cohort.
## Step-Down Passive Avoidance — methods controls Confounds controlled in this protocol: - **Foot-shock intensity.** Retention latency scales with shock intensity. Without a calibrated and reported intensity, group differences can reflect the conditioning stimulus rather than memory. - **Locomotor activity.** A generally hypoactive animal steps down less often, inflating retention latency independent of memory. Report locomotor activity as a check. - **Baseline step-down latency.** A long pre-shock training latency confounds retention. Record training latency and consider a cutoff for animals that fail to step down. - **Retention interval.** Consolidation depends on the delay between training and test. A variable retention interval mixes consolidation states across animals. - **Handling stress.** Inconsistent handling adds stress that alters step-down behavior. Standardize handling, placement, and timing across the cohort.
Step-down passive avoidance is strongest when foot-shock intensity, training-latency recording, retention interval, and handling are fixed before testing. A single retention latency is a screening signal; confirm memory effects with training-latency controls and an independent task such as the shuttle box in the same cohort. 1
A long pre-shock step-down latency means the animal was already hesitant, which confounds the retention measure. Recording training latency lets you confirm baseline behavior was comparable and exclude outliers by a pre-set cutoff.
Calibrate the scrambled foot-shock to a brief, fixed intensity and report it. Retention latency scales with intensity, so it must be held constant across all groups to keep the memory comparison valid.
Yes. A hypoactive animal steps down less often, inflating retention latency independent of memory. Report locomotor activity as a check so a low-activity artifact is not read as strong consolidation.
Quarterly editorial review of emerging Step-Down Passive Avoidance methodology. Q2 2026
Calibrating and reporting scrambled foot-shock intensity across rigs improves comparability of retention latency between labs and apparatus models.
Platform load cells and floor-grid sensing remove observer timing variance and capture step-down events and latency consistently.
Recording and modeling pre-shock training latency as a covariate is increasingly expected because baseline hesitation shifts retention latency independent of memory.
Step-down avoidance is paired with shuttle-box avoidance and contextual fear conditioning to separate inhibitory avoidance from active avoidance and reactive responding in the same cohort.
§ 5
6 selected methods and validation references for Step-Down Passive Avoidance.
