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Full-Text Articles in Psychology
Top-Down And Bottom-Up Attentional Guidance: Investigating The Role Of The Dorsal And Ventral Parietal Cortices, Sarah Shomstein, Jeongmi Lee, Marlene Behrmann
Top-Down And Bottom-Up Attentional Guidance: Investigating The Role Of The Dorsal And Ventral Parietal Cortices, Sarah Shomstein, Jeongmi Lee, Marlene Behrmann
Marlene Behrmann
Recent neuroimaging studies suggest that the superior parietal lobule (SPL) of the human cortex mediates goal-directed attentional orienting, while the temporo-parietal junction (TPJ) mediates stimulus-driven attentional orienting. Here, we investigated these brain-behavior correspondences by examining the performance of patients with an attentional deficit following a right hemisphere lesion. Patients completed two tasks, one sensitive to stimulus-driven attentional orienting and the other to goal-directed attentional orienting. Based on the behavioral profiles obtained on each task, patients were assigned to different groups and their lesion overlap explored. Patients who exhibited difficulties with goal-directed attentional orienting and showed concurrent “hyper-capture” presented with lesion …
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 …
Right Parietal Contributions To Verbal Working Memory: Spatial Or Executive?, Susan Ravizza, Marlene Behrmann, Julie Fiez
Right Parietal Contributions To Verbal Working Memory: Spatial Or Executive?, Susan Ravizza, Marlene Behrmann, Julie Fiez
Marlene Behrmann
The left inferior parietal cortex has been claimed to be the site of the verbal short-term store, yet imaging studies report activity of a homologous right-hemisphere region in verbal working memory tasks as well. In spite of its prevalent activity, right parietal contributions to verbal working memory are poorly understood. To clarify its role in verbal working memory performance, we tested a patient with a lesion in the right parietal lobe on verbal and spatial versions of the N-back task. The patient was impaired in all the spatial conditions regardless of load (0-, 1-, and 2-back), whereas in the verbal …