Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Scanning the visual world: a study of patients with homonymous hemianopia
Autore:
Pambakian, ALM; Wooding, DS; Patel, N; Morland, AB; Kennard, C; Mannan, SK;
Indirizzi:
Dept Sensorimotor Syst, Div Neurosci & Psychol Med, London W6 8RP, EnglandDept Sensorimotor Syst London England W6 8RP Med, London W6 8RP, England Univ Derby, Inst Behav Sci, Derby DE22 3HL, England Univ Derby Derby England DE22 3HL nst Behav Sci, Derby DE22 3HL, England Univ London, Royal Holloway & Bedford New Coll, Dept Psychol, Egham TW20 0EX, Surrey, England Univ London Egham Surrey England TW20 0EX Egham TW20 0EX, Surrey, England
Titolo Testata:
JOURNAL OF NEUROLOGY NEUROSURGERY AND PSYCHIATRY
fascicolo: 6, volume: 69, anno: 2000,
pagine: 751 - 759
SICI:
0022-3050(200012)69:6<751:STVWAS>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
EYE-MOVEMENT STRATEGIES; PERCEPTION; PATTERNS; NEGLECT; SYSTEM; SCANPATH; IMAGES;
Keywords:
homonymous hemianopia; eye movements; visual search;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Pambakian, ALM Dept Sensorimotor Syst, Div Neurosci & Psychol Med, CharingCross Campus,St Dunstans Rd, London W6 8RP, England Dept Sensorimotor SystCharing Cross Campus,St Dunstans Rd London England W6 8RP
Citazione:
A.L.M. Pambakian et al., "Scanning the visual world: a study of patients with homonymous hemianopia", J NE NE PSY, 69(6), 2000, pp. 751-759

Abstract

Objectives-This study examined the scanpaths of patients with homonymous hemianopia while viewing naturalistic pictures in their original and also spatially filtered forms. Features of their scanpaths with respect to varioussaccade and fixation parameters were examined to determine whether they develop compensatory eye movement strategies. The effects of various lesion parameters including location, size, and age on the evolution of such strategies were considered. Methods-Eye movements of eight patients with homonymous hemianopia (four left, four right), but lacking neglect, were recorded while they viewed 22 images of real scenes, and they were compared with the eye movements of eight age matched controls. Subjects viewed each image for 3 seconds, initiallyin a spatially filtered form in which much of the semantic content had been removed, and then in their unfiltered, original form. Results-Patients differed significantly front controls in various fixationand saccade parameters. For fixation parameters patients with hemianopia fixated different spatial positions from controls, made more fixations whichwere more widely distributed and of shorter duration than controls, and spent a greater proportion of their total fixation time in the area corresponding to their blind hemifield. They did not make significantly more refixations than controls. For saccade parameters patients made more saccades intotheir blind hemifield, these saccades having shorter latencies and shorteramplitudes than those made into their seeing field, and had longer scanpaths than control subjects. The amplitude of their first saccade was longer than that of controls although its direction did not correlate simply with the side of the field defect. Their mean saccade amplitude was similar to that of controls. Filtering out high spatial frequencies within images seemedto accentuate the described differences between eye movement characteristics of hemianopes and controls. Scanpath differences correlated with increasing age but not location or size of lesions causing the hemianopia. Conclusion-Various features of scanpaths produced by hemianopes were different from normal subjects. These differences correlated with lesion age andmay reflect the evolution of a compensatory eye movement strategy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 11:08:03