Approach-Avoidance Conflict Test
Overview
The approach-avoidance conflict test (also known as the Vogel conflict test or punished responding paradigm) measures anxiety by placing an appetitive motivation (water or food reward) in direct conflict with an aversive consequence (typically mild footshock). Water-deprived animals must approach and drink from a lickometer spout, but receive mild shocks contingent on licking. Anxiolytic drugs selectively increase punished responding (licks despite shock) without altering unpunished consummatory behavior, providing a pharmacologically validated measure of anxiety distinct from general locomotor effects.
Key dependent variables include the number of punished licks (licks during shock-contingent periods), unpunished licks (during safe periods or separate unpunished sessions), the ratio of punished to unpunished responding, shock-induced suppression ratio, and the latency to resume licking after each shock delivery. The conflict model has high predictive validity for clinical anxiolytic efficacy and detects both GABAergic and serotonergic compounds.
ConductMaze precisely controls the lickometer circuit detection with millisecond resolution, delivers shocks contingent on programmable lick schedules (e.g., every 20th lick), and independently manages punishment and safe periods within sessions. The system logs individual lick timestamps, shock deliveries, and inter-lick intervals, enabling microstructural analysis of licking patterns that can dissociate anxiolytic from analgesic or motor-impairing drug effects.
Trial Flow
Deprivation Confirm
Verify animal has been water-deprived per protocol (typically 24-48 hours)
Chamber Placement
Place animal in conflict chamber with accessible lickometer spout
Unpunished Period
Initial free-drinking period to establish baseline lick rate
Conflict Onset
Activate shock contingency: mild shock delivered per lick schedule
Conflict Assessment
Evaluate punished lick rate relative to unpunished baseline
Lick Microstructure
Analyze inter-lick intervals, bout structure, and post-shock pauses
Session End
Remove animal; provide water access in home cage per protocol
Parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
| Deprivation Period | integer | 48 | Water deprivation duration in hours prior to testing |
| Unpunished Duration | integer | 180 | Initial free-drinking period in seconds |
| Conflict Duration | integer | 180 | Punished responding period in seconds |
| Shock Schedule | string | VR20 | Lick-contingent shock schedule: FR (fixed) or VR (variable) ratio |
| Shock Intensity | float | 0.3 | Footshock current in milliamps |
| Shock Duration | float | 0.5 | Duration of each shock in seconds |
| Max Session Duration | integer | 600 | Total maximum session length in seconds |
Metrics
| Metric | Unit | Description |
|---|---|---|
| Punished Licks | count | Total licks during shock-contingent conflict period |
| Unpunished Licks | count | Total licks during initial free-drinking period |
| Suppression Ratio | ratio | Punished / (Punished + Unpunished) licks |
| Shocks Received | count | Number of shock deliveries during conflict period |
| Post-Shock Pause | seconds | Mean latency to resume licking after each shock |
| Lick Bout Length | licks | Mean number of consecutive licks per bout during conflict |
| Latency to First Lick | seconds | Time from session start to first lick contact |
Sample Data
| Subject | Treatment | Unpunished Licks | Punished Licks | Suppression Ratio | Shocks | Post-Shock Pause (s) |
|---|
Representative data for illustration purposes. Actual values will vary by species, strain, and experimental conditions.
Applications
- 1Anxiolytic drug screening \u2014 gold-standard conflict model with high predictive validity for clinical efficacy
- 2GABAergic pharmacology \u2014 dose-response characterization of benzodiazepines and GABA modulators
- 3Serotonin system \u2014 evaluating anxiolytic onset of SSRIs and 5-HT1A agonists in conflict models
- 4Translational anxiety \u2014 back-translating clinical anxiety paradigms to preclinical decision-making under threat
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