Source Paper
Dopamine in Motor Cortex Is Necessary for Skill Learning and Synaptic Plasticity
Katiuska Molina-Luna, Ana Pekanovic, et al.
Source Paper
Katiuska Molina-Luna, Ana Pekanovic, et al.
PLoS ONE • 2009
Preliminary evidence indicates that dopamine given by mouth facilitates the learning of motor skills and improves the recovery of movement after stroke. The mechanism of these phenomena is unknown. Here, we describe a mechanism by demonstrating in rat that dopaminergic terminals and receptors in primary motor cortex (M1) enable motor skill learning and enhance M1 synaptic plasticity. Elimination of dopaminergic terminals in M1 specifically impaired motor skill acquisition, which was restored upon DA substitution. Execution of a previously acquired skill was unaffected. Reversible blockade of M1 D1 and D2 receptors temporarily impaired skill acquisition but not execution, and reduced long-term potentiation (LTP) within M1, a form of synaptic plasticity critically involved in skill learning. These findings identify a behavioral and functional role of dopaminergic signaling in M1. DA in M1 optimizes the learning of a novel motor skill.
Objective: To assess motor skill learning and forelimb reaching performance in rats through a trained reaching task involving door opening and food pellet retrieval
This is a Motor Skill Training - Reaching Task protocol using rat as the model organism. The procedure involves 7 procedural steps, 7 equipment items, 3 materials. Extracted from a 2009 paper published in PLoS ONE.
Model and subjects
rat • Long-Evans • male • 8-10 weeks • 250-350 g
Study window
~2.1 week study window | ~24 hours hands-on
Core workflow
Pre-training phase - Day 1-5 • Pre-training pellet retrieval • Motor skill training initiation - Forelimb preference determination
Primary readouts
Key equipment and reagents
Verified items
0
Direct vendor links
0
Use this page as an execution guide, then fall back to the source paper whenever you need exact exclusions, dosing details, or assay-specific caveats.
Confirm first
Use the page like this
Start here. The step list is optimized for running the experiment, with direct vendor links available inline when you need to source a cited item.
Animals are food-restricted for 24 hours before first pre-training session. During pre-training, rats learn to open the motorized sliding door by nose-poking the light sensor in the rear wall. Door opening provides access to one food pellet located on a small horizontal board outside the cage.
Note: Food restriction occurs only before first pre-training session. During training, animals are kept slightly over initial weight by providing 50 mg/kg standard lab diet after each session. Water given ad libitum.
“Animals were food-restricted for 24 hr before the first pre-training session. Animals were first pre-trained for five days learning to open the motorized sliding door that covered the front window, by nose-poking the sensor in the rear”
During pre-training, pellets are retrieved by tongue from the horizontal board. Upon retrieval, the pellet is automatically replaced by the pellet dispenser.
Note: This establishes the association between door opening and food reward before requiring skilled reaching
“During pre-training pellets were retrieved by tongue. Upon retrieval the pellet was automatically replaced by a pellet dispenser”
Pre-training is followed by 6-15 days of motor skill training. The board is removed and the pellet is placed on a vertical post 1.5 cm away from the window, requiring forelimb retrieval. The first skill training session determines forelimb preference and consists of 50 door openings (trials).
Note: Forelimb preference determination is necessary before surgical instrumentation of the hemisphere contralateral to the preferred limb
“motor skill training that was initiated by removing the board and placing the pellet on a vertical post 1.5 cm away from the window. The first skill training session was to determine forelimb preference and consisted of 50 door openings”
After determining forelimb preference, the pedestal is shifted to one side of the window to allow reaching with the preferred limb only, contralateral to the hemisphere injected or instrumented for drug injection.
Note: This ensures reaching is performed with the preferred forelimb only
“the pedestal was shifted to one side of the window to allow reaching with the preferred limb only, contralateral to the hemisphere injected or instrumented for drug injection”
All subsequent training sessions after preference determination consist of 100 trials (door openings). Sessions are performed at the beginning of the dark phase. Each trial involves the rat performing a forelimb extension to target, pronation, paw opening, grasping motion, forelimb retention combined with supination to bring pellet to mouth.
Note: Sessions occur at beginning of dark phase. Daily sessions involve 115.8±5.7 forelimb movements (mean±SEM), automatically sensed by motion sensor
“All subsequent sessions consisted of 100 trials. Training sessions were performed at the beginning of the dark phase. Daily training sessions consisted of 100 trials (= door openings), involved 115.8±5.7 forelimb movements, mean±SEM, automatically sensed by a sensor between cage wall and pedestal) and lasted 24.8±0.5 min, mean±SEM”
Each reaching trial is scored as 'successful' (reach, grasp and retrieve) or 'unsuccessful' (pellet pushed off pedestal or dropped during retraction). Success rate is calculated as the ratio of successful trials to total trials per session (100).
Note: Rats mainly improve target reach and grasp elements during training
“Each reaching trial was scored as 'successful' (reach, grasp and retrieve) or 'unsuccessful' (pellet pushed off pedestal or dropped during retraction). The success rate was defined as the ratio of the number of successful trials and the total number of trials per session, i.e. 100”
The latency between pellet removal and subsequent door opening is used as an index of motivation.
“The latency between pellet removal and subsequent door opening was used as an index of motivation”
This section explains what the experiment is doing, which readouts matter, what the data artifacts usually look like, and how the analysis should flow from raw capture to reported result.
To assess motor skill learning and forelimb reaching performance in rats through a trained reaching task involving door opening and food pellet retrieval
Objective
To assess motor skill learning and forelimb reaching performance in rats through a trained reaching task involving door opening and food pellet retrieval
Subjects
From paperrat • Long-Evans • male • 8-10 weeks • 250-350 g
Cohort notes
From paperAdult male rats raised in animal facility, housed individually on 12/12-hr light/dark cycle (light on: 3am, off: 3pm)
Pre-training phase - Day 1-5 (5 days)
Pre-training pellet retrieval
Motor skill training initiation - Forelimb preference determination (6-15 days total; first session = 50 trials)
Pedestal positioning for preferred limb
Success rate (ratio of successful trials to total trials per session)
From paperNot explicitly described in methods section
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Forelimb preference (determined in first 50-trial session)
From paperNot explicitly described in methods section
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Number of forelimb movements per session (automatically sensed)
From paperNot explicitly described in methods section
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Session duration
From paperNot explicitly described in methods section
Artifact type
Endpoint measurements summarized by group or timepoint
Comparison focus
Compare endpoint magnitude between groups, timepoints, or both
Success rate (ratio of successful trials to total trials per session)
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Forelimb preference (determined in first 50-trial session)
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Number of forelimb movements per session (automatically sensed)
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Session duration
From paperRaw artifact
Per-sample or per-animal endpoint measurements collected during the experiment
Processed artifact
Structured table with cleaned measurements ready for comparison
Final reported form
Summary statistics and between-group or across-timepoint comparisons
Acquisition
Collect raw experimental outputs with enough metadata to preserve sample identity, condition, and timing.
Preprocessing / cleaning
Not explicitly described in methods section
Scoring or quantification
Quantify the primary readouts for this experiment: Success rate (ratio of successful trials to total trials per session); Forelimb preference (determined in first 50-trial session); Number of forelimb movements per session (automatically sensed); Session duration.
Statistical comparison
Statistical method not yet structured for this page.
Reporting output
Report representative outputs alongside summary comparisons for Success rate (ratio of successful trials to total trials per session), Forelimb preference (determined in first 50-trial session), Number of forelimb movements per session (automatically sensed), Session duration.
Source links and direct wording from the methods section for validation and deeper review.
Citation
Katiuska Molina-Luna et al. (2009). Dopamine in Motor Cortex Is Necessary for Skill Learning and Synaptic Plasticity. PLoS ONE
“”
“”
“”
“”
Direct vendor pages are linked from the protocol above. This section stays focused on the full comparison view and the prep checklist.
Gather these items before starting the experiment. Check off items as you prepare.
Bio-serve
Sigma-Aldrich Chemie GmbH, Munich, Germany
Use this section as the page quality checkpoint. It keeps section navigation, evidence access, readiness, and verification meaning in one place.
Current status surfaces were computed from experiment data updated Feb 28, 2026.
Source access
Jump back into the original paper or the methods evidence section when you need exact wording, exclusions, or method-specific caveats.
This protocol has structured steps plus evidence quotes, and is ready for canonical sync.
Steps
7
Evidence Quotes
17
Protocol Items
10
Linked Products
0
Canonical Sync
Pending
What this means
The completeness score reflects how much structured protocol data is present: steps, methods evidence, listed materials, linked products, and paper provenance.
Computed from the current experiment record updated Feb 28, 2026.
Canonical Sync shows whether a ConductGraph-backed protocol is available for this experiment route right now. It is a sync-status signal, not a claim that every downstream vendor link or step detail is perfect.
Steps
7
Evidence
17
Specific Products
0/0
Canonical Sync
Pending
What this score means
The verification score reflects evidence coverage, subject detail, paper provenance, step depth, and whether linked products resolve to specific item pages instead of generic searches.
Computed from the current experiment record updated Feb 28, 2026.
A page can have structured steps and still need review when evidence is thin, product links are generic, or canonical protocol coverage is still pending.
What still needs work