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Biomedical subjects

J A Sergeant

Publications and source records attributed to J A Sergeant.

5 recordsLinked to original sources
PubMed1988

What happens after a hyperactive child commits an error?

Children with a diagnosis of attention deficit disorder with hyperactivity can correct errors, just as controls can. They differ from controls in how they adjust the speed of processing on a trial after they have committed an error. Controls are fast in responding after an error when cognitive load is small. When cognitive load is high, however, they take considerable time to ensure, after an error has occurred, that a correct response is given. After an error has been committed, hyperactive children, irrespective of the demands of load, have no response adjustment and maintain a constant rate of processing.

Attention Deficit Disorder with Hyperactivity↗
PubMed1985

On resource strategy limitations in hyperactivity: cognitive impulsivity reconsidered.

Overactive and distractible (hyperactives), normoactive and distractible, and normoactive and attentive (controls) children were administered a high-speed visual search task. The display load was manipulated and all subjects were administered the task in three instruction conditions: speed, 'normal' and accuracy. Speed-accuracy trade-off curves indicated that the controls and distractibles conformed to the fast guess model, which relates speed and accuracy. Hyperactives partially conformed to this model. It is concluded that a structural process deficit is not indicated by these data in hyperactivity. Rather, the evidence suggests that a resource strategy defect may be characteristic of hyperactivity.

Attention↗
PubMed1985

On data limitations in hyperactivity.

Three groups of children rated firstly as overactive and distractible, secondly as distractible and thirdly as low on both activity and distractibility were examined in a visual search task with three levels of display load: two, three and four items. The children were tested twice in two conditions of stimulus visibility to examine the encoding stage of the model used here. The experimental results reject the hypothesis that an encoding deficit or data limitation may explain the attentional performance of either hyperactive or somewhat hyperactive subjects. They suggest, rather, that a trade-off in speed and accuracy may be evident in (the) hyperactives.

Attention↗
PubMed1983

A stages-of-information approach to hyperactivity.

In a memory search task with context recognition, three groups of children were examined: hyperactives, somewhat hyperactives and controls. It was found that the hyperactive groups differed from controls at the intercept of reaction time and not the slope. This was interpreted as evidence against a selective attention hypothesis in hyperactivity and evidence of either an 'encoding' or a response organization deficit. The unexpected slower and less accurate performance of somewhat hyperactives than those rated as hyperactives may have been due to the higher rating of variable task application in the former than in the latter.

Attention↗