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E A Lawson

Publications and source records attributed to E A Lawson.

18 recordsLinked to original sources
PubMed1981

Mismatch negativity in a phonetic discrimination task.

The hypothesis was tested that in a discrimination task the number of phonetic features available determines the latencies and amplitudes of the components of the evoked potentials. Six conditions varying in the number and type of discriminatory cues were compared. The condition containing a three phonetic feature discrimination produced shorter latency evoked potentials as compared with the conditions containing one or two such features or an acoustic difference only. The N2 component, the so-called mismatch negativity, was particularly sensitive to the number of phonetic features.

Discrimination Learning↗
PubMed1977

Radiological features of tuberculosis of the spine in Ibadan, Nigeria.

In Nigeria, tuberculosis of the spine remains an important medical problem in the diagnosis and management of which radiology plays an invaluable role. The present study reviewed sixty-nine cases seen in 1966-1972 at the University College Hospital, Ibadan, Nigeria. The possible radiological classification of the disease was grouped into seven different types:- (i) disc space narrowing only (ii) kissing lesions; (iii) wedge collapse of vertebra; (iv) vertebra plana; (v) lesions localised in the vertebral body and/or its appendages; (vi) para-spinal abscesses; (vii) complete destruction of vertebral body. The dorsolumbar region was the most frequently involved with D.11 vertebra being most often affected. The maximum number of vertebrae involved was eight but involvement of two was the most frequent. Some uncommonly reported radiological features encountered include bone sclerosis, intervertebral non-osteophytic bony bridge formation and skip lesions.

Abscess↗