Self-stimulation behavior can be elicited from various 'aversive' brain structures.

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Neurobiology

Background:

• The negative motivational system in the brain is typically associated with aversive stimuli and escape responses.
• Electrical stimulation of certain brain regions, including the dorsal central gray area (CG), medial hypothalamus (MH), medial lemniscus (ML), lateral tegmentum (LT), and reticular formation (RF), induces escape behaviors in mice.

Purpose of the Study:

• To investigate the paradoxical self-stimulation behavior elicited by electrical stimulation of brain regions within the negative motivational system.
• To explore the approach components of stimulation in these typically aversive brain areas.

Main Methods:

• Electrical brain stimulation was applied to various regions of the negative motivational system in mice.
• Behavioral responses were assessed using a Y-maze task and a lever press box.
• Mice were allowed to self-administer electrical stimulation.

Main Results:

• Stimulation of all tested negative motivational system regions, despite aversive consequences, also produced self-stimulation behavior.
• Mice successfully discriminated between reinforced and non-reinforced arms in a Y-maze to self-administer stimulation from certain regions.
• Self-stimulation was evident in the lateral hypothalamus (LH) and some RF/MH implanted mice, but less so in CG, LT, and ML.

Conclusions:

• Electrical stimulation of the negative reinforcement system possesses an approach component.
• This approach behavior is more clearly demonstrated in specific experimental contexts, such as the Y-maze.
• The motivational properties of different stimulation sites within the negative reinforcement system vary.