Incubation of Craving
Overview
The incubation of craving phenomenon describes the time-dependent increase in drug-seeking behavior during protracted withdrawal. After self-administration training and forced abstinence (not extinction), cue-induced drug seeking is tested at different withdrawal time points — typically days 1, 7, 14, 30, and 90. Responding to drug-paired cues progressively increases over the first 1-3 months of abstinence, peaking around day 30 for cocaine, before gradually declining.
This incubation effect, first described by Grimm et al. (2001), has been demonstrated for cocaine, heroin, methamphetamine, nicotine, sucrose, and high-fat food. It depends on time-dependent neuroplasticity in the amygdala and nucleus accumbens, including accumulation of calcium-permeable AMPA receptors. The incubation model is translationally relevant because human addicts also show increased craving during early abstinence.
ConductMaze automates the incubation protocol with multi-cohort longitudinal scheduling. The software manages home-cage withdrawal periods, administers cue-reactivity tests at programmed withdrawal time points, and generates incubation curves plotting cue-induced responding as a function of withdrawal day. Between-subject and within-subject designs are supported.
Trial Flow
Self-Admin Phase
Drug self-administration training (10-14 days)
Forced Abstinence
Home cage withdrawal (NO extinction training)
Withdrawal Time Point
Has target withdrawal day been reached?
Cue-Reactivity Test
Lever presses produce cues but no drug (extinction test)
Response Recording
Active and inactive presses recorded for 1-2 hours
Return to Home Cage
Continue withdrawal until next test point
Incubation Curve
Generate responding vs. withdrawal day function
Parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
| Drug | enum | Cocaine | Drug used during self-administration phase |
| SA Sessions | integer | 10 | Number of self-administration training sessions |
| SA Session Length | seconds | 7200 | Duration of each self-administration session |
| Test Time Points | enum | 1,7,14,30,90 | Withdrawal days for cue-reactivity testing |
| Test Session Duration | seconds | 3600 | Duration of each cue-reactivity test session |
| Cue Type | enum | Light+Tone | Drug-paired cues presented during test (light, tone, compound) |
| Design | enum | Between-Subject | Between-subject (one test per animal) or within-subject (repeated tests) |
| Active Lever Side | enum | Right | Which lever was drug-associated during training |
Metrics
| Metric | Unit | Description |
|---|---|---|
| Active Presses at Test | count | Active lever presses during cue-reactivity test at each withdrawal day |
| Inactive Presses at Test | count | Inactive lever presses during test (specificity control) |
| Incubation Ratio | ratio | Responding at late vs. early withdrawal (e.g., Day 30 / Day 1) |
| Peak Incubation Day | day | Withdrawal day with maximum cue-induced responding |
| Time Course (15-min bins) | presses/bin | Within-session response pattern during each test |
| SA Baseline Intake | infusions | Mean infusions per session during last 3 days of self-administration |
Sample Data
| Withdrawal_Day | n | Active_Presses | Inactive_Presses | Incubation_Ratio | SA_Baseline_Inf |
|---|
Representative data for illustration purposes. Actual values will vary by species, strain, and experimental conditions.
Applications
- 1Craving neurobiology — studying time-dependent neuroplasticity during withdrawal
- 2Anti-craving medication — testing compounds that prevent incubation-related neuroadaptations
- 3AMPA receptor research — calcium-permeable AMPA receptor accumulation drives incubation
- 4Natural reward comparison — comparing incubation curves for drugs vs. palatable food
- 5Relapse vulnerability — identifying the withdrawal period of peak relapse risk
Related Protocols
Compatible Products
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