SynopsisThe clinical condition occurring in the elderly with preserved intellectual functions, characterized by vivid, elaborate and dynamic recurrent visual pseudo-hallucinatory phenomena of a pleasant or neutral nature and often associated with ocular pathology – the Charles Bonnet Syndrome – is described. Its main clinical features are illustrated and the aetiology discussed. Two new cases are presented and areas for future research are outlined.

The duration of standardised overbreathing required to produce slow wave activity in the EEG during different phases of the menstrual cycle has been studied, and changes in carbon dioxide sensitivity of the respiratory system. Normal subjects developed slow waves more quickly and had more sensitive CO2 responses during the premenstrual/menstrual phases. This may be a factor contributing to premenstrual tension.

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