Biomedical subjects

P Moes

Publications and source records attributed to P Moes.

3 recordsLinked to original sources

PubMed2001

The stability of compromised interhemispheric processing in callosal dysgenesis and partial commissurotomy.

The persistence and stability of selective deficits in interhemispheric processing resulting from known callosal pathology have been monitored over periods ranging from ten to thirty five years. The present study included five patients: two with complete agenesis of the corpus callosum, one with partial dysgenesis, and two with a partial section of the corpus callosum. A crossed-uncrossed difference task and four bilateral visual matching tasks were administered to these patients and to groups of normal individuals matched on age and intelligence. As expected, all of the patients showed deficits in speed or accuracy relative to the performance of their control groups. The profile of performance for each patient across the five tasks demonstrated a systematic (but not perfectly consistent) relationship with the location and extent of callosal pathology.

Adolescent↗

PubMed1996

Interhemispheric transfer time differences related to aging and gender.

The difference in simple reaction times to unstructured stimuli contralateral to the hand used for response ('crossed' responses) and those stimuli ipsilateral to the hand used for response ('uncrossed' responses)--or crossed-uncrossed difference (CUD) is assumed to be a reliable index of interhemispheric transfer time (IHTT). Studies using the CUD paradigm with acallosal patients as well as a variety of populations with known variations in callosal size or functioning have demonstrated that such callosal differences are reflected in differences in recorded CUD times. Recent studies have suggested that elderly individuals show a reduction in size of the corpus callosum, particularly in the anterior region. In order to assess any potential change in callosal transfer efficiency with aging. CUDs were obtained from elderly (60+ years) and younger subjects (18 30 years). The elderly subjects showed a significantly elongated CUD compared to younger subjects, with elderly females contributing the greatest increase. No significant gender differences were found for younger subjects. In addition, an unexpected trend for an overall right field reaction time advantage was found for all subgroups, accompanied by a larger calculated CUD for right hand responses than for left hand responses.

Adolescent↗

PubMed1981

[Superficial veins of the human spinal cord. An attempt at classification].

By studying the systematization of superficial veins in 70 human spinal cords, it is possible to recognize three different systems: anterior, posterior and lateral. The anterior spinal venous system is formed by an antero-medial trunk extending from the filum terminale to the medulla oblongata, and by two antero-lateral spinal trunks placed in the cranial part of the spinal cord. The posterior, spinal venous system is formed by a postero-medial spinal trunk, extending from the sacral spinal cord to the medulla oblongata, and by two postero-lateral venous trunks, in the thoracic region. The lateral spinal venous system forms an anastomotic system between the anterior and posterior venous systems; it is especially well developed in the lumbar enlargement. In this venous disposition, it can be recognized three types of networks: transversal, longitudinal and arciform, more or less intertwined according to the considered spinal levels.

Collateral Circulation↗