-
Journal of Neuropsychology Mar 2018Prism adaptation (PA) is a widely used intervention for (visuo-)spatial neglect. PA-induced improvements can be assessed by visual search tasks. It remains unclear which...
Prism adaptation (PA) is a widely used intervention for (visuo-)spatial neglect. PA-induced improvements can be assessed by visual search tasks. It remains unclear which outcome measures are the most sensitive for the effects of PA in neglect. In this review, we aimed to evaluate PA effects on visual search measures. A systematic literature search was completed regarding PA intervention studies focusing on patients with neglect using visual search tasks. Information about study content and effectiveness was extracted. Out of 403 identified studies, 30 met the inclusion criteria. The quality of the studies was evaluated: Rankings were moderate-to-high for 7, and low for 23 studies. As feature search was only performed by five studies, low-to-moderate ranking, we were limited in drawing firm conclusions about the PA effect on feature search. All moderate-to-high-ranking studies investigated cancellation by measuring only omissions or hits. These studies found an overall improvement after PA. Measuring perseverations and total task duration provides more specific information about visual search. The two (low ranking) studies that measured this found an improvement after PA on perseverations and duration (while accuracy improved for one study and remained the same for the other). This review suggests there is an overall effect of PA on visual search, although complex visual search tasks and specific visual search measures are lacking. Suggestions for search measures that give insight in subcomponents of visual search are provided for future studies, such as perseverations, search path intersections, search consistency and using a speed-accuracy trade-off.
Topics: Adaptation, Physiological; Humans; Perceptual Disorders; Visual Perception
PubMed: 26866327
DOI: 10.1111/jnp.12100 -
Survey of Ophthalmology 2015Palinopsia, the persistence or recurrence of visual images after the stimulus has been removed, is a nonspecific term that describes multiple types of visual symptoms... (Review)
Review
Palinopsia, the persistence or recurrence of visual images after the stimulus has been removed, is a nonspecific term that describes multiple types of visual symptoms with a wide variety of etiologies. For example, palinopsia may be the presenting symptom of a potentially life-threatening posterior cortical lesion, yet it may also be a benign medication side effect. We comprehensively review all published cases and subdivide palinopsia into two clinically relevant categories: illusory palinopsia and hallucinatory palinopsia.
Topics: Afterimage; Brain Diseases; Eye Diseases; Hallucinations; Humans; Illusions
PubMed: 25113609
DOI: 10.1016/j.survophthal.2014.06.003