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Dorsal Column Steerability with Dual Parallel Leads using Dedicated Power Sources: A Computational Model

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Cross-tolerance between two brainstem sites supporting stimulation-produced analgesia.

B E Thorn-Gray, M H Johnson, R M Ashbrook

Behavioral and Neural Biology

|September 1, 1982

Summary

Repeated brain stimulation led to reduced pain relief (tolerance) at one site. This tolerance transferred to a different brain site, suggesting a shared mechanism for pain processing.

Area of Science:

Neuroscience
Pain Research
Behavioral Science

Background:

Focal brain stimulation is a method to study pain modulation.
Behavioral tolerance can develop with repeated stimulation.

Purpose of the Study:

To investigate if behavioral tolerance to focal brain stimulation-induced analgesia can transfer between different brain sites.
To explore potential shared mechanisms in pain processing.

Main Methods:

Stereotactic surgery in rats to implant electrodes in the periaqueductal gray matter.
Assessment of analgesia using the tail-flick test.
Induction of tolerance via repeated stimulation at one site and testing at a naive site.

Main Results:

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Focal brain stimulation effectively produced analgesia at both electrode sites.
Repeated stimulation at one site induced behavioral tolerance.
A significant transfer of behavioral tolerance was observed from the stimulated site to the non-stimulated site.

Conclusions:

Behavioral tolerance to focal brain stimulation-induced analgesia can transfer between different brain sites.
This cross-tolerance suggests a common neurochemical or neural substrate involved in pain modulation.
Further research is needed to elucidate the underlying mechanisms.