Nicotine enhances the ability of cues to control behavior and evoke dopamine release in the dorsolateral striatum
Nicotine does not reward by itself—it super-sizes cue control, but only for learners already responding slowly.
01Research in Context
What this study did
Leonard et al. (2025) gave mice a lever to press.
A light or sound cue came on only when the lever produced food.
Some mice then got a tiny shot of nicotine before sessions.
The team watched how the drug changed pressing and brain dopamine.
What they found
Nicotine did not make all mice work harder.
It boosted pressing and dopamine only in mice that started slow.
The drug only helped when cues were tied to food.
If cues were absent, nicotine had no effect.
How this fits with other research
Costa et al. (2025) also show rate matters.
They found bigger reinforcer rates, not size, keep humans persisting.
Both papers say baseline rate sets how extra input works.
Buskist et al. (1988) tied bigger rewards to faster human responding.
Leonard’s mice echo this: low starters gained the most.
Gover et al. (2022) remind us that contingent cues hook learners.
Nicotine simply turns up that existing hook, it does not create it.
Why it matters
You already watch how fast a client responds before you add help.
This study says drugs or other add-ons may only help low-rate cases.
High performers might show no gain or even disruption.
Check baseline first, then decide if an extra boost is worth trying.
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02At a glance
03Original abstract
Nicotine is one of the most widely used addictive substances, yet its primary reinforcing effects are relatively weak. Nicotine’s ability to potentiate responding for conditioned reinforcers is thought to drive persistent drug use. Here, we show that nicotine failed to alter responding maintained by a primary sucrose reinforcer (under a variable-ratio [VR] 11 schedule) across a broad dose range (0.01–1.0 mg/kg). Yet, nicotine enhanced operant behavior under a second-order reinforcement schedule in which responses produced sucrose-associated cues and were only intermittently reinforced by sucrose itself. Together, we demonstrate that nicotine selectively augments behavior maintained by conditioned reinforcers (sucrose-associated cues) in a rate-dependent manner, increasing responding only in mice with low rates of reinforcement behavior at baseline. Using fiber photometry, we demonstrate that nicotine selectively amplified cue-evoked dopamine release in the dorsolateral striatum—but only in low baseline responders—while having no effect on dopamine signaling in the nucleus accumbens. These effects were blocked by the nicotinic receptor antagonist mecamylamine. Further, nicotine’s influence on behavior was abolished when the contingency between action and conditioned stimuli was disrupted, indicating that nicotine strengthens cue control of behavior rather than increasing motivation generally. Collectively, these findings reveal that nicotine’s behavioral actions emerge through an interaction between pharmacological mechanisms, behavioral contingencies, and individual differences in baseline behavioral control. Nicotine strengthens the impact of environmental cues on behavior by amplifying dopamine signals in specific projection targets, but only in individuals with specific behavioral traits. This reveals how nicotine hijacks learning processes to promote persistent, cue-driven actions.
The Journal of Pharmacology and Experimental Therapeutics, 2025 · doi:10.1016/j.jpet.2025.103662