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Brain potentials related to corpus cavernosum electromyography.

J Ponseti¹, H A Bosinski

¹Section of Sexual Medicine, Christian-Albrechts-University of Kiel, Arnold-Heller-Strasse 12, Kiel, Germany. ponseti@sexmed.uni-kiel.de

International Journal of Impotence Research

|March 26, 2010

Summary

Brain activity influences penile responses. This study found that electroencephalogram (EEG) activity correlates with corpus cavernosum (CC) electrical signals, suggesting rapid brain control over erections and potential for diagnosing erectile dysfunction.

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Area of Science:

Neuroscience
Urology
Physiology

Background:

Penile erection involves complex interactions between the central nervous system and peripheral physiological processes.
Understanding the precise timing and brain mechanisms underlying penile responses is crucial for diagnosing and treating erectile dysfunction.

Purpose of the Study:

To investigate the relationship between brain activity (EEG), corpus cavernosum (CC) electrical activity (CC-EMG), and penile responses during sexual stimulation.
To determine the temporal dynamics of brain involvement in initiating and maintaining penile erection.

Main Methods:

Simultaneous recording of EEG potentials, penile circumference, and CC-EMG in male subjects exposed to visual sexual stimuli.
Independent Component Analysis (ICA) applied to EEG data, correlated with CC activity and penile response phases (erection, maintenance, detumescence).

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Main Results:

Corpus cavernosum (CC) electrical activity decreased during erection.
EEG activity showed correlations with CC activity, often occurring simultaneously or preceding CC changes.
Early EEG activity (<300 ms post-stimulus) correlated with CC activity, indicating pre-attentive brain processing for penile response.

Conclusions:

Corpus cavernosum (CC) activity is under direct central nervous system (brain) control.
Autonomic neural signals reach the CC within milliseconds of sexual stimulus onset.
The experimental paradigm offers a potential objective method for assessing psychogenic erectile dysfunction.