BMJ 2009; 338 doi: https://doi.org/10.1136/bmj.b1289 (Published 01 April 2009) Cite this as: BMJ 2009;338:b1289

Teenage brains develop critically between the ages of 11 and 16.5 years. Brain wave recordings showed a significant reduction in brain waves during deep sleep between these ages, consistent with “synaptic pruning”—a form of neuronal streamlining (Proceedings of the National Academy of Sciences 2009; published online 23 March, doi:10.1073/pnas.0812947106). This non-invasive approach may help investigate psychiatric disorders that emerge during brain maturation.

Male grooming fashions currently encourage men to sport short hairstyles. An Indian observer comments that while most women part their hair in the middle and most men prefer a side parting, when a man grows his hair longer the side parting shifts towards the midline, and the reverse tendency is seen in women with shorter hair. Writing in Medical Hypotheses (2009;72:373-84 doi:10.1016/j.mehy.2008.11.014), he wonders whether hair parting preference is an involuntary behavioural expression of gender identity.

Glucagon like peptide-1 (GLP-1) is …

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