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Biomedical subjects

L S Jordan

Publications and source records attributed to L S Jordan.

13 recordsLinked to original sources
PubMed1984

Disturbances of long-term memory in aphasic patients. A comparison of anterior and posterior lesions.

The performance of 20 aphasic patients on a verbal list-learning task was examined in relation to site of lesion, as documented by CT scan. Patients with lesions of the inferior frontal lobe and/or the basal ganglia were severely impaired in both acquisition and long-term retention of the list, while the performance of patients with posterior temporoparietal involvement was nearly normal. These results contrasted sharply with scores on short-term memory tests by the same patient groups which showed an opposite trend. The findings support a functional and neuroanatomical dissociation of short and long-term memory systems and suggest that neural connections of the inferior frontal lobe and the basal ganglia may be crucial for initiating the retrieval process.

Adult↗
PubMed1980

Receptive and expressive language problems occurring in combination with a seizure disorder: a case report.

The purpose of this case report is to present an example of a child with receptive and expressive language problems occurring in combination with a seizure disorder. For a period of 3 years the seizure disorder appeared to be controlled by medication and the child made substantial improvement in a language remediation program. A sudden disruption of decoding abilities was the only behavioral indication that the treatment program needed to be reassessed. Descriptions of the child's behaviors, subsequent neurological evaluation, and goals of the language habilitation program are presented.

Child↗
PubMed1978

Performance of children with good and poor articulation on tasks of tongue placement.

This study determined whether children could learn to replicate four positions of lingual-palatal contact with and without topical anesthesia that eliminated touch-pressure sensations. First-grade boys, nine with good articulation skills and nine with poor articulation skills, were used as subjects. Results suggest that individuals are able to learn nonspeech tasks of tongue positioning by relying on muscle spindles or deep receptors within the tongue, or both, or by relying on lingual touch-pressure or other surface receptors within the tongue, or, by a combination of deep and surface receptors of the tongue. Further, tongue positioning need not be dependent on touch-pressure or superficial tactile mechanisms. Children with relatively severe articulation problems performed more poorly on the tasks of precise tongue placement than children with good articulation skills. And finally, children with relatively severe articulation problems may be able to improve their initially poor performance on tongue placement tasks with specific training on those tasks, implying that this group did receive the intraoral sensory feedback necessary to learn the task, but that more experience was needed for the learning to occur.

Child↗
PubMed1975

Metabolism of terbacil in orange seedlings.

Orange seedlings were cultured in aqueous solutions of 3-tert-butyl-5-chloro-6-methyluracil (terbacil and terbacil-2-14C). Radioactivity was distributed throughout the plant with the largest amount in the roots and the smallest amount in the leaves. Terbacil was metabolized to form 3-tert-butyl-5-chloro-6-hydroxymethyl uracil, which was conjugated to form a beta-glucoside as the conjugate was hydrolyzed by beta-glucosidase. Identification of the metabolite was made by infrared and mass spectrometry after isolation and purification by column and thin layer chromatography. An additional unidentified water-soluble material was accumulated in the plant. 5-chloro-uracil was not detected as a metabolite of terbacil.

Chromatography, Thin Layer↗