In order to study auditory spatial localization in subjects with posterior damage involving the parietal lobe, we investigated their manual pointing performances to linguistic and white noise signals distributed over six sound sources situated in the anterior auditory field at ear level. The results showed: (1) A striking difference between patterns of deficits associated with right and left damage. In subjects with right damage, auditory localization deficits occurred in the horizontal plane, were manifested as restrictions in the peripheral left auditory hemifield and tended to be related to left visual neglect. In subjects with left damage, auditory localization deficits occurred in the entire auditory field in the horizontal as well as vertical planes, and they were particularly strong in the antero-frontal region. (2) One subject with right damage and visual neglect but no left auditory spatial restriction, showed deficits in the right hemifield where sound source location tended to be overestimated. This subject also showed a better discrimination of the origin of a white noise than of a linguistic signal. Results are discussed in terms of hemispheric asymmetries of function.

SummaryThe development of a computerized neuropsychological examination (ECO), designed to evaluate intellectual functioning in elderly populations, is described. The examination is based on clinical and laboratory observations of cognitive functioning in normal and pathological ageing. ECO provides extensive information on attention, memory, and visuospatial and linguistic functioning, and the use of a touch screen permits the recording of reaction time and response delays. Information regarding qualitative aspects of responses is also recorded. The examination takes relatively little time given the extent of the information obtained (approximately 40 min), is highly acceptable to the elderly, and provides qualitative neuropsychological data although administered by lay interviewers. The results obtained by a normal group of 335 elderly persons aged between 60 and 100 years are discussed in relation to age and education level.

No abstract