Jason H Calhoun

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Behavioral and neurophysiological studies suggest that the brain constructs different representations of space. Among these representations are personal and peripersonal space. Personal space refers to the space occupied by our bodies. Peripersonal space refers to the space surrounding our bodies, which can be reached by our limbs. How these two(More)
Extinction is thought to be due to a pathologically limited attentional capacity in which multiple stimuli cannot be processed simultaneously to conscious awareness. Patients with tactile extinction are aware of being touched on a contralesional limb, but seem unaware of similar contralesional touch if touched simultaneously on their ipsilesional limb. The(More)
We investigated tactile awareness in three patients with tactile extinction of stimuli located on contralesional somatotopic space. Contralesional tactile awareness was enhanced when they gazed to the left and when they moved their limbs. We suggest that personal somatotopic and peripersonal space are integrated by polymodal and sensorimotor links, which(More)
When patients with left-sided neglect are asked to bisect horizontal lines, they tend to place their marks to the right of the line's objective mid-point. However, when asked to bisect short lines they are either more accurate or paradoxically cross over and place their marks to the left of the objective mid-point. Previous explanations of the cross over(More)
Left-neglect patients bisect horizontal lines to the right of true center. Longer lines are bisected further to the right than shorter lines. This line-length effect might be explained by an increase in the rightward bias of attention because longer lines extend further ipsilesionally. Alternatively, neglect patients might be limited in their abilities to(More)
This biographical sketch of Joseph C. Risser Sr. He earned his medical degree from the University of Iowa in 1923 and served his residency at the New York Orthopedic Hospital [7]. During his residency, he became a protégé of Russell Hibbs, MD (1869–1932), who pioneered spinal fusion for scoliosis patients in the early 20th century [14]. As a resident,(More)
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