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Titolo:
VISUAL SHORT-TERM-MEMORY OF STIMULUS VELOCITY IN PATIENTS WITH UNILATERAL POSTERIOR BRAIN-DAMAGE
Autore:
GREENLEE MW; LANG HJ; MERGNER T; SEEGER W;
Indirizzi:
UNIV FREIBURG,NEUROL KLIN,HANSASTR 9 D-79104 FREIBURG GERMANY UNIV FREIBURG,NEUROCHIRURG KLIN D-79104 FREIBURG GERMANY
Titolo Testata:
The Journal of neuroscience
fascicolo: 3, volume: 15, anno: 1995,
parte:, 2
pagine: 2287 - 2300
SICI:
0270-6474(1995)15:3<2287:VSOSVI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR TEMPORAL SULCUS; PURSUIT EYE-MOVEMENTS; CORTICAL AREAS MT; POSITRON EMISSION TOMOGRAPHY; MARMOSET CALLITHRIX-JACCHUS; MACAQUE MONKEY; MOTION SELECTIVITY; RHESUS-MONKEY; EXPANSION CONTRACTION; CEREBRAL-LESIONS;
Keywords:
VELOCITY DISCRIMINATION; HUMAN TEMPORAL CORTEX; VISUAL SHORT-TERM MEMORY; CONTRAST SENSITIVITY; SPATIOTEMPORAL VISION; PSYCHOPHYSICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
75
Recensione:
Indirizzi per estratti:
Citazione:
M.W. Greenlee et al., "VISUAL SHORT-TERM-MEMORY OF STIMULUS VELOCITY IN PATIENTS WITH UNILATERAL POSTERIOR BRAIN-DAMAGE", The Journal of neuroscience, 15(3), 1995, pp. 2287-2300

Abstract

Neurophysiological studies indicate the existence of an area in the extrastriate monkey cortex specialized for the processing of stimulus motion. The present investigation was conducted to determine whether a homologous area exits in the human cortex that underlies the processing and short-term storage of velocity information. Contrast detection and velocity discrimination thresholds were measured in a group of 23 patients with unilateral focal damage to either the lateral occipital, temporal, or posterior parietal cortex. Their results were compared tothose of 23 age-matched control subjects. Detection and discrimination thresholds were determined for spatially truncated sinewave gratingspresented 4 degrees eccentric of fixation randomly in either the leftand right visual fields. Contrast detection thresholds were measured in a spatial two-alternative forced-choice paradigm for three different drift rates (1, 2, and 4 Hz) for leftward and rightward drift directions. Simultaneous velocity discrimination thresholds were determined for reference and test gratings presented 4 degrees left and right of fixation. Sequential velocity discrimination thresholds were measured using a delay, with a interstimulus interval (ISIs) of 1, 3, and 10 sec. In a subset of five patients with superior temporal lobe damage, spatial frequency discrimination thresholds for stationary gratings werealso determined. The results indicate the following: (1) contrast detection thresholds for drifting gratings did not significantly differ between the patient and control groups; (2) velocity discrimination thresholds were significantly elevated in the patients; (3) velocity discrimination thresholds significantly increased with increasing ISI in the patients; (4) velocity discrimination thresholds were elevated mostwhen the patients had a lesion in the superior temporal cortex; (5) in the subgroup of five patients with superior temporal lobe damage, spatial frequency discrimination thresholds were not significantly elevated. The results suggest that there is a visual area in the human posterior temporal cortex that is involved in the processing and shorttermstorage of the velocity of moving visual stimuli.

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Documento generato il 28/09/20 alle ore 23:45:32