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Full-Text Articles in Psychology
Impaired Initiation But Not Execution Of Contralesional Saccades In Hemispatial Neglect, Marlene Behrmann, Thea Ghiselli-Crippa, Ilaria Dimatteo
Impaired Initiation But Not Execution Of Contralesional Saccades In Hemispatial Neglect, Marlene Behrmann, Thea Ghiselli-Crippa, Ilaria Dimatteo
Marlene Behrmann
Patients with unilateral neglect are impaired at making saccades to contralesional targets. Whether this problem arises from a deficit in perception, in planning the saccade or in executing the eye movement or some combination thereof remains unclear. We measured several variables related to the initiation and execution of saccades in an experiment which crossed two factors: target side (left, right) and direction of saccade (leftwards, rightwards). Relative to control subjects, patients with left-sided neglect were impaired in planning but not executing the contralesional saccade; while the latency to move their eyes following the onset of the target was increased, the …
Competition Between Simultaneous Stimuli Modulated By Location Probability In Hemispatial Neglect, Joy Geng, Marlene Behrmann
Competition Between Simultaneous Stimuli Modulated By Location Probability In Hemispatial Neglect, Joy Geng, Marlene Behrmann
Marlene Behrmann
Many aspects of spatial neglect can be explained as arising from competition for attentional selection, with salient ipsilesional stimuli emerging as the winner more often than contralesional stimuli. The outcome of the competition, however, can be affected both by bottom-up perceptual factors such as the gestalt properties of the display and by top-down factors such as expectancy or stimulus blocking. This study examines whether the competition for attentional selection can be modulated by manipulating the probability of the target's location in hemispatial neglect. Five patients with left-sided hemispatial neglect and a group of control participants performed a visual target discrimination …
Hemispatial Neglect: Its Effects On Visual Perception And Visually Guided Grasping, Jonathan Marotta, Thomas Mckeeff, Marlene Behrmann
Hemispatial Neglect: Its Effects On Visual Perception And Visually Guided Grasping, Jonathan Marotta, Thomas Mckeeff, Marlene Behrmann
Marlene Behrmann
Hemispatial neglect is a neurological disorder characterized by a failure to represent information appearing in the hemispace contralateral to a brain lesion. In addition to the perceptual consequences of hemispatial neglect, several authors have reported that hemispatial neglect impairs visually guided movements. Others have reported that the extent of the impairment depends on the type of visually guided task. Finally, in some cases, neglect has been shown to impair visual perception without affecting visuomotor control in relation to the very same stimuli. While neglect patients may be able to successfully pick up an object they have difficulty perceiving in its …