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Programmed Electrical Stimulation in Mice
Published on: May 26, 2010
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Adaptation effects of medial forebrain bundle micro-electrical stimulation.
Sepideh Farakhor1, Vahid Shalchyan1, Mohammad Reza Daliri1
1a Neuroscience & Neuroengineering Research Lab., Biomedical Engineering Department , School of Electrical Engineering, Iran University of Science and Technology (IUST) , Tehran , Iran.
Bioengineered
|March 28, 2019
Summary
Temporal adaptation diminishes the effectiveness of medial forebrain bundle (MFB) electrical stimulation in rats. This study quantifies adaptation effects, revealing reduced self-stimulation over consecutive days, particularly at specific frequencies and pulse-widths.
Area of Science:
- Neuroscience
- Neurophysiology
- Behavioral Science
Background:
- Deep brain stimulation (DBS) offers therapeutic applications for neurological and psychiatric conditions.
- Electrical stimulation of the medial forebrain bundle (MFB) in rats induces pleasure, serving as a virtual reward for navigation.
- Temporal adaptation can diminish the acute effects of brain electrical stimulation.
Purpose of the Study:
- To investigate the adaptation effects of medial forebrain bundle (MFB) electrical stimulation in rats.
- To determine how stimulation parameters (frequency, amplitude, pulse-width) influence MFB stimulation adaptation.
- To quantify the reduction in self-stimulation behavior due to temporal adaptation.
Main Methods:
- Rats were trained in an operant conditioning chamber to self-stimulate the MFB via key presses.
- Stimulation parameters, including frequency (100–400 Hz), amplitude (50–170 µA), and pulse-width (180–2000 µs), were systematically varied.
- The number of key presses over consecutive days was analyzed to evaluate adaptation effects.
Main Results:
- Adaptation effects were observed at a stimulation frequency of 250 Hz.
- Stimulation amplitude did not significantly impact MFB adaptation.
- Adaptation, indicated by a decrease in key presses on the second day, occurred across all tested pulse-widths over two consecutive days.
Conclusions:
- Temporal adaptation significantly affects MFB self-stimulation in rats, reducing its reinforcing efficacy over time.
- Specific stimulation frequencies and pulse-widths influence the rate and extent of adaptation.
- Understanding adaptation is crucial for optimizing MFB stimulation protocols in research and potential therapeutic applications.
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