On the effects of testosterone on brain behavioral functions

Area of Science:

• Neuroendocrinology
• Behavioral Neuroscience
• Reproductive Biology

Background:

• Testosterone exerts organizational and activational effects on the brain.
• Existing research on testosterone's influence on behavior and cognition yields controversial and puzzling results.
• Factors like dosage, timing, and administration route significantly impact study outcomes, alongside challenges in psychometric assessment validity and reproducibility.

Purpose of the Study:

• To review and summarize the current understanding of testosterone's complex effects on the brain.
• To highlight the role of testosterone in known sex differences.
• To discuss the influence of testosterone metabolism and non-genomic pathways.

Main Methods:

• Literature review of studies on rodents and humans.
• Analysis of research focusing on behavioral and cognitive parameters.
• Examination of testosterone metabolism pathways (5-alpha reductase, aromatase).

Main Results:

• Testosterone's effects on the brain are complex and influenced by multiple factors, leading to inconsistent findings.
• Metabolism of testosterone into dihydrotestosterone and estradiol contributes to its diverse actions.
• Non-genomic effects of testosterone on behavior, independent of nuclear receptors, are an emerging area of research.

Conclusions:

• The precise mechanisms underlying testosterone's effects on the brain, particularly concerning sex differences, require further elucidation.
• Addressing methodological limitations in research is crucial for advancing our understanding.
• Further investigation into non-genomic pathways may reveal novel insights into testosterone's neurobiological roles.