Independent neural coding of reward and movement by pedunculopontine tegmental nucleus neurons in freely navigating rats: Reward and movement codes of PPTg neurons
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Phasic firing of dopamine (DA) neurons in the ventral tegmental area (VTA) and substantia nigra (SN) is likely to be crucial for reward processing that guides learning. One of the key structures implicated in the regulation of this DA burst firing is the pedunculopontine tegmental nucleus (PPTg), which projects to both the VTA and SN. Different literatures suggest that the PPTg serves as a sensory-gating area for DA cells or it regulates voluntary movement. This study recorded PPTg single-unit activity as rats perform a spatial navigation task to examine the potential for both reward and movement contributions. PPTg cells showed significant changes in firing relative to reward acquisition, the velocity of movement across the maze and turning behaviors of the rats. Reward, but not movement, correlates were impacted by changes in context, and neither correlate type was affected by reward manipulations (e.g. changing the expected location of a reward). This suggests that the PPTg conjunctively codes both reward and behavioral information, and that the reward information is processed in a context-dependent manner. The distinct anatomical distribution of reward and movement cells emphasizes different models of synaptic control by PPTg of DA burst firing in the VTA and SN. Relevant to both VTA and SN learning systems, however, PPTg appears to serve as a sensory gating mechanism to facilitate reinforcement learning, while at the same time provides reinforcement-based guidance of ongoing goal-directed behaviors.
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The PPTg acts as a gate for salient sensory information associated with reward and/or requiring movement.
“These observations have led to the idea that the PPtg acts as a gate for salient sensory information associated with reward and/or requiring movement (Norton et al., 2011).”
From Acetylcholine as a Neuromodulator: Cholinergic Signaling Shapes Nervous System Function and Behavior (2012) · cites this paper as Norton et al., 2011
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- Authors
- Norton, A. B. W., Jo, Y. S., Clark, E. W., Taylor, C. A., & Mizumori, S. J. Y.
- Affiliations
- University of Washington (US)
- Corresponding author
- Mizumori, Sheri J. Y.
- Venue
- European Journal of Neuroscience
- Publisher
- Wiley
- Published
- 2011-03-14
- Volume
- 33
- Issue
- 10
- Pages
- 1885-1896
- ISSN
- 0953-816X (ISSN-L)
- PMC
- PMC3095748
- OpenAlex
- W1554587170
- Cited by
- 66
- References
- 52
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 5 · 2023: 3 · 2022: 4 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 4 · 2017: 6 · 2016: 11 · 2015: 7 · 2014: 7 · 2013: 5 · 2012: 1
- FWCI
- 1.85
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- European Journal of Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of Mental Health (R56MH058755, MH-58755, R01MH058755)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Keywords
- pedunculopontine nucleus, reward coding, single-unit activity, spatial navigation, sensory gating, reinforcement learning, goal-directed behavior, substantia nigra, ventral tegmental area, dopaminergic neurons, rats
- MeSH terms
- Action Potentials, Animals, Behavior, Animal, Dopamine, Male, Movement, Neurons, Reward, Spatial Behavior, Rats, Long-Evans, Pedunculopontine Tegmental Nucleus, Rats
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