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.
Pregnant cannabis users, developmental neuroscientists, and clinicians concerned about prenatal exposure outcomes
What the researchers 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.
Why it 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 numbers in context
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 the study worked
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.
What this study cannot 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.
How to read the evidence
Well-designed preclinical study combining behavioral and neurochemical measures, but animal model limitations apply.
When this study was published
Published in 2026, advancing mechanistic understanding of prenatal cannabis exposure effects on motivation.
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.
Questions still open
- Are these motivational deficits permanent or recoverable? Could early behavioral interventions compensate for prenatal THC-related reward circuit changes?
Common questions
Can cannabis use during pregnancy affect a child's motivation?
What is 'reinforcer devaluation'?
Read the original research
Perinatal exposure to delta-9-tetrahydrocannabinol (THC) alters goal-directed behavior and dopamine functioning in wistar rats.
Psychopharmacology
Citation
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
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