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Open Field Test Analyzer.

Upload XY tracking data. Get total distance, velocity, center vs periphery time, thigmotaxis index, path trace overlay, and time-bin analysis.

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Validated2026-04-05
CitableMethods and citation included

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Load example Open Field Test data to see the full workflow

Arena Configuration

Upload XY Tracking Data

CSV with columns for time, x, y (and optionally animal ID and group). Supports EthoVision, ANY-maze, Zantiks, and generic formats. Works with rodent and zebrafish data.

When to use

  • Analyze XY tracking data from open field test sessions to compute distance, velocity, center time, and thigmotaxis
  • Compare locomotor activity and anxiety-like behavior across treatment groups with error bars
  • Visualize animal paths with heatmap density maps and path trace overlays
  • Perform time-bin analysis to detect habituation patterns and drug effects on locomotor temporal profiles
  • Export per-animal metrics to CSV for downstream statistical analysis (ANOVA, etc.)
  • Enter pre-computed summary metrics when XY data is not available

Do not use for

  • Real-time video tracking — use ConductVision or dedicated tracking software (EthoVision, ANY-maze) to generate XY data first
  • Elevated plus maze or other anxiety assays with different arena geometry
  • Social interaction tests requiring tracking of multiple animals simultaneously in the same arena

Define center zone consistently across studies

The center zone definition (what percentage of the arena area constitutes "center") dramatically affects center time results. The most common convention is 25% of total arena area (a center square whose side is 50% of the arena side in a square arena). Document your center zone definition explicitly in your methods section and keep it consistent across all experimental groups.

Report both total activity and zone metrics

Sedating drugs reduce total distance traveled, which can artificially reduce center time simply because the animal is not moving — not because it is more anxious. Always report total distance alongside center time and thigmotaxis. If total locomotion differs significantly between groups, consider analyzing center time as a proportion of total distance rather than absolute time.

Time-bin analysis reveals what total metrics hide

Two animals can have identical total distance but very different temporal patterns. One may show normal habituation (high initial activity declining over time) while another shows no habituation (flat activity). Always examine time-bin data, especially when testing drugs that affect learning or arousal.

Lighting conditions critically affect baseline behavior

Bright lighting increases anxiety and thigmotaxis in rodents. Standard OFT protocols use 200-300 lux at the arena floor for testing anxiety-like behavior. If your primary measure is locomotor activity rather than anxiety, lower lighting (50-100 lux) may be appropriate. Document illumination level and keep it consistent.

Arena cleaning between animals is essential

Rodents are highly sensitive to olfactory cues from conspecifics. Urine and fecal deposits from previous animals will affect the behavior of subsequent subjects. Clean the arena with 70% ethanol or an enzymatic cleaner between each animal and allow it to dry completely before the next test.

Resources

  • Arena dimensions appropriate for species (40×40cm mice, 60×60cm rats)
  • Uniform lighting across arena floor (±10% variation)
  • Center zone defined (typically inner 50% of area)
  • Arena walls high enough to prevent escape
  • Clean arena between animals (consistent agent)
  • Camera overhead with full arena coverage
  • No shadows or reflections on arena floor
  • Tracking software zone definitions verified
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Method

Distance is computed as the sum of Euclidean distances between consecutive XY points. Velocity is distance divided by total session time. Center zone is defined as a centered region whose area equals the specified percentage of the total arena area. Thigmotaxis zone is the outermost 10% of arena width from each wall. Time-bin analysis divides the session into equal intervals and computes metrics per bin. Group statistics use sample standard deviation (n-1 denominator) for SEM. All computation is client-side — no data leaves your browser.

2

Validated

Last validated 2026-04-05. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

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How to cite

How to Cite

ConductScience Open Field Test Analyzer (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/open-field-test-analyzer

This tool performs mathematical calculations on user-provided data. It does not replace scientific judgment regarding experimental design, exclusion criteria, or statistical analysis.

What Is the Open Field Test?

The Open Field Test (OFT) was first described by Calvin Hall in 1934 as a measure of emotional reactivity in rats. Today it is one of the most commonly used assays in behavioral neuroscience, pharmacology, and toxicology. The apparatus is a simple enclosed arena — rectangular or circular — with opaque walls high enough to prevent escape. The animal is placed in the center or a corner and allowed to freely explore for a set duration (typically 5-30 minutes). A video camera mounted above the arena captures the animal's position over time. From the XY tracking data, researchers extract metrics including total distance traveled (locomotor activity), mean velocity, time spent in the center vs. periphery (anxiety index), number of center zone entries, and thigmotaxis index (wall-hugging). The OFT is valued for its simplicity, the absence of aversive stimuli beyond novelty itself, and its sensitivity to a wide range of pharmacological and genetic manipulations affecting locomotion, exploration, and anxiety.

Understanding Thigmotaxis in the Open Field

Thigmotaxis — the tendency to maintain close contact with the walls of an enclosure — is one of the most robust behavioral phenomena observed in the open field test. In a novel environment, rodents instinctively seek the relative safety of the arena periphery, a behavior thought to reflect predator-avoidance strategies that have been conserved across mammalian evolution. Quantitatively, thigmotaxis is measured as the proportion of time (or distance) spent in a narrow peripheral zone, typically defined as the outermost 10% of the arena width from the walls. Anxiolytic drugs such as diazepam and buspirone reliably reduce thigmotaxis, increasing center exploration, while anxiogenic manipulations (e.g., bright lighting, novel predator odors, or corticotropin-releasing factor administration) increase it. Importantly, thigmotaxis must be distinguished from hypolocomotion: a sedated animal may appear to stay near the wall simply because it is not moving, not because of anxiety. This is why reporting both total distance and thigmotaxis index together is essential for accurate interpretation.

Time-Bin Analysis and Habituation

Dividing an open field session into sequential time bins (typically 5 minutes each) reveals how behavior changes over the course of the test. The most important temporal pattern is within-session habituation: a progressive decline in locomotor activity as the animal becomes familiar with the novel environment. Habituation reflects basic non-associative learning and is sensitive to hippocampal lesions, aging, and pharmacological manipulations. Time-bin analysis can also reveal stimulant-induced locomotor sensitization (progressively increasing activity), anxiolytic effects (increasing center time over bins), or sedative effects (decreasing activity faster than controls). When comparing groups, it is not sufficient to compare only total-session metrics — two groups may have identical total distance but very different temporal profiles. For example, a drug group might show normal initial exploration but impaired habituation, resulting in equivalent total distance but a flat distance-over-time curve vs. the characteristic declining curve in controls.

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