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Published on: May 3, 2012
Single unit activity in the rat superior colliculus during reward magnitude task performance
Douglas A Weldon1, Carlyn A Patterson, Erica A Colligan
1Department of Psychology, Hamilton College, Clinton, NY 13323, USA. dweldon@hamilton.edu
Behavioral Neuroscience
|February 27, 2008
Summary
Neurons in the rat superior colliculus (SC) show activity during food retrieval. Some SC cells differentiate between high and low reward magnitudes, suggesting reward coding.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Sensory Processing
Background:
- The superior colliculus (SC) plays a role in sensorimotor functions.
- Previous research indicates SC neuronal activity is linked to reward-related behaviors.
Purpose of the Study:
- To investigate the activity of single units in the rat SC during a food retrieval task.
- To determine if SC neuronal activity encodes different reward magnitudes.
Main Methods:
- Rats were trained on a T-maze alternation task with differential reward sizes.
- Single-unit recordings were performed in the intermediate and deep layers of the SC using microelectrodes.
- Neuronal activity was analyzed in relation to running, food retrieval, and reward magnitude.
Main Results:
- Most recorded SC units exhibited activity associated with food retrieval, specifically upon stopping or snout insertion.
- A subset of units (16%) displayed distinct activity patterns for high versus low reward retrieval.
- While many units responded to sensory stimuli (e.g., snout touch), this was not correlated with food retrieval activity.
Conclusions:
- SC neurons are involved in processing food retrieval behaviors in rats.
- Some SC neurons encode information about the magnitude of the reward stimulus.
- Sensory sensitivity in SC cells is not directly linked to their role in reward-driven food retrieval.
