PubMed Health⌕ Search

Biomedical subjects

J A Middleton

Publications and source records attributed to J A Middleton.

5 recordsLinked to original sources
PubMed2001

Practitioner review: psychological sequelae of head injury in children and adolescents.

Many children suffer an injury to the head at some time, but relatively few of these cause major problems. However, in a few cases the sequelae can be far reaching. This review considers how to evaluate the significance of a head injury. Factors to consider are (1) injury variables: cause, severity and type of injury; (2) child variables: premorbid functioning, age, and developmental level of the child both at injury and at assessment; and (3) the cognitive, behavioural, and emotional problems that may arise. Parental beliefs and knowledge about the injury as well as the overall effect of an injury on the family as a whole are also considered.

Adolescent↗
PubMed1998

Equivalence between temporal frequency and modulation depth for flicker response suppression: analysis of a three-process model of visual adaptation.

We analyze adaptation processes responsible for eliciting and alleviating flicker response suppression, which is a class of phenomena characterized by the selective reduction of visual response to the ac component of a flickering light. Stimulus conditions were chosen that would allow characteristic features of flicker response suppression to be defined and manipulated systematically. Data are presented to show that reducing the sinusoidal modulation depth of an 11-Hz stimulus can correspond precisely to raising the temporal frequency of a fully modulated stimulus. In each case there is a nonmonotonic relation between flicker response and dc test illuminance. The nonmonotonic relation cannot be explained by adaptation models that postulate multiplicative and subtractive adaptation processes followed by a single static saturating nonlinearity, even when temporal frequency filters are incorporated into such models. A satisfactory explanation requires an additional contrast gain-control process. This process enhances flicker response at progressively lower temporal response contrasts as the illuminance of a surrounding field increases.

Adaptation, Physiological↗
PubMed1992

Plantar fasciitis-heel pain in athletes.

Plantar fasciitis is the most frequent hind foot problem that affects runners. It occurs when repetitive stress is placed on the heel from a chronic or acute condition. Athletes with biomechanical imbalances are most susceptible to this condition. They exhibit pain in the morning upon weight bearing and, frequently, in the acute stage, have discoloration of the injured area. Management includes preventive and therapeutic exercise, physical therapy, strengthening routines, taping, and the use of orthotics and non-steroidal anti-inflammatory drugs (NSAIDs). Although injections and NSAIDs bring relief, their effects are often only temporary. This condition is best treated with therapeutic exercises and orthotics in order to correct the athlete's biomechanical faults. This article presents principles and techniques that can be used to effectively prevent and treat plantar fasciitis.

Journal Article↗