Rats Exposed to THC Before Birth Show Less Motivation — Especially Males
Rats exposed to THC during pregnancy and nursing showed reduced motivation on effort-demanding tasks as adults, particularly males, with attenuated dopamine responses in the reward center — providing a biological basis for prenatal cannabis's 'amotivational' effects.
Quick Facts
What This Study Found
Perinatal THC exposure (5 mg/kg/day from pre-breeding to PND 14) decreased motivation on high-effort operant tasks in both sexes, with males showing fewer reinforcers earned; dopamine response to cocaine was attenuated in the nucleus accumbens without baseline DA changes.
Key Numbers
THC 5 mg/kg/day oral; exposure from 14 days pre-breeding to PND 14; decreased DRL burst responses and completed trials (both sexes); fewer reinforcers in males; attenuated NAc dopamine response to cocaine.
How They Did This
Perinatal THC exposure study in Wistar rats (oral 5 mg/kg/day, 14 days pre-breeding to PND 14), with adult offspring tested on DRH and DRL operant tasks and in vivo amperometry measuring dopamine in mPFC and NAc.
Why This Research Matters
This provides a neurobiological mechanism for the 'amotivational syndrome' reported in prenatally exposed humans — reduced dopamine reactivity in reward circuits may literally make rewards less rewarding.
The Bigger Picture
The concept of 'reinforcer devaluation' — that prenatal THC exposure makes rewards feel less worthwhile — could explain why some prenatally exposed individuals struggle with motivation and goal-directed behavior.
What This Study Doesn't Tell Us
Animal model; single THC dose; oral administration may not reflect human smoking; cocaine challenge is an indirect measure of DA function; cannot separate prenatal from postnatal (milk) exposure effects.
Questions This Raises
- ?Are these motivational deficits permanent or recoverable?
- ?Could early behavioral interventions compensate for prenatal THC-related reward circuit changes?
Trust & Context
- Key Stat:
- Evidence Grade:
- Well-designed preclinical study combining behavioral and neurochemical measures, but animal model limitations apply.
- Study Age:
- Published in 2026, advancing mechanistic understanding of prenatal cannabis exposure effects on motivation.
- Original Title:
- Perinatal exposure to delta-9-tetrahydrocannabinol (THC) alters goal-directed behavior and dopamine functioning in wistar rats.
- Published In:
- Psychopharmacology (2026)
- Authors:
- Carbajal, Monica S, Crenshaw, Rebecca C, Williams, Victoria E, Billings, Laura G, Dixon, Chelsea M, Lester, Deranda B, Sable, Helen J K
- Database ID:
- RTHC-08150
Evidence Hierarchy
Frequently Asked Questions
Can cannabis use during pregnancy affect a child's motivation?
This rat study found that prenatal THC exposure reduced motivation on effort-demanding tasks in adult offspring, with males more affected, linked to changes in the brain's dopamine reward system.
What is 'reinforcer devaluation'?
It means rewards literally feel less valuable — the researchers suggest prenatal THC exposure may make the brain's reward system less responsive, causing decreased motivation to work for goals.
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Cite This Study
https://rethinkthc.com/research/RTHC-08150APA
Carbajal, Monica S; Crenshaw, Rebecca C; Williams, Victoria E; Billings, Laura G; Dixon, Chelsea M; Lester, Deranda B; Sable, Helen J K. (2026). Perinatal exposure to delta-9-tetrahydrocannabinol (THC) alters goal-directed behavior and dopamine functioning in wistar rats.. Psychopharmacology. https://doi.org/10.1007/s00213-026-07023-w
MLA
Carbajal, Monica S, et al. "Perinatal exposure to delta-9-tetrahydrocannabinol (THC) alters goal-directed behavior and dopamine functioning in wistar rats.." Psychopharmacology, 2026. https://doi.org/10.1007/s00213-026-07023-w
RethinkTHC
RethinkTHC Research Database. "Perinatal exposure to delta-9-tetrahydrocannabinol (THC) alt..." RTHC-08150. Retrieved from https://rethinkthc.com/research/carbajal-2026-perinatal-exposure-to-delta9tetrahydrocannabinol
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.