Jorm, A. F., Butterworth, P., Anstey, K. J., Christensen, H., Easteal, S., Maller, J., Mather, K. A., Turakulov, R. I., Wen, W. & Sachdev, P. (2004). Memory complaints in a community sample aged 60–64 years: associations with cognitive functioning, psychiatric symptoms, medical conditions, APOE genotype, hippocampus and amygdala volumes, and white-matter hyperintensities. Psychological Medicine 34, 1495–1506.

We found diurnal weight gain to be abnormal among 28 institutionalized chronically psychotic patients. They were weighed daily for 15 days at 7 a.m. and 4 p.m. We normalized the diurnal weight gain (NDWG) as a percentage by subtracting the 7 a.m. weight from the 4 p.m. weight, multiplying the difference by 100, and then dividing the result by the 7 a.m. weight. NDWG was 2·8 ± 1·3% for the 28 study patients, 0·631 ±0·405% for 16 acutely psychotic controls, and 0·511 ±0·351 % for 29 normals. Ninety-three per cent of the study sample had NDWG values above the upper limit of normal. Sex, diagnosis, smoking, baseline weight, blood pressure, and pulse did not explain these observations. NDWG related (N = 28, r = 0·552, P = 0·002) to antipsychotic drug dose. The implications of our findings are discussed.

Ways in which chemical techniques could be applied to the understanding of neural systems, their functioning and their disorders were devised only gradually during the present century. In a particularly successful procedure, now termed assay-guided isolation, neural defects were made good by means of tissue-extracts and the restoration of function was established as an assay-system to guide the chemical separation and identification of the active tissue constituent. Thiamin was so isolated, using an experimental polyneuritis assay; subsequent instances among other metabolites, hormones, neurotransmitters and nerve growth factors are recounted. Procedures of assay-guided characterization ensured that links were retained between specific, sparsely-occurring substances and chosen aspects of their biological roles while their chemical nature was first explored and then established. The procedures discouraged the too-facile postulating of hypothetical molecules and contributed to the distinctiveness of neurochemistry as a subject within the neurosciences.

Seventy-six patients were interviewed within a week of admission following a parasuicide episode. Axis II diagnosis on DSM-III was made for schizotypal, borderline, histrionic, and antisocial personality disorder. In addition patients completed a self-rating questionnaire, the Schizotypy Questionnaire of Claridge & Broks (1984), which assesses schizotypal and borderline personality traits. The objective and subjective indices of schizotypal and borderline symptoms correlated significantly but allocation of patients to a diagnosis missed several patients who nevertheless rated themselves as having a high frequency of these symptoms. There was an asymmetry of symptom pattern reminiscent of Foulds & Bedford's (1975) hierarchy model. The presence of schizotypal symptoms appeared to be higher in the hierarchy: they predicted borderline symptoms, but a high frequency of borderline symptoms did not necessarily predict schizotypy. We suggest that the occurrence of schizotypal symptoms should become a more explicit focus of clinical assessment and treatment of these patients, especially those who repeatedly harm themselves and we suggest ways in which cognitive therapies may be adapted to do this.