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The Cortical Control of Visually Guided Grasping
, 2008
"... People have always been fascinated by the exquisite precision and flexibility of the human hand. When hand meets object, we confront the overlapping worlds of sensorimotor and cognitive functions. The complex apparatus of the human hand is used to reach for objects, grasp and lift them, manipulate t ..."
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People have always been fascinated by the exquisite precision and flexibility of the human hand. When hand meets object, we confront the overlapping worlds of sensorimotor and cognitive functions. The complex apparatus of the human hand is used to reach for objects, grasp and lift them, manipulate them, and use them to act on other objects. This review examines what is known about the control of the hand by the cerebral cortex. It compares and summarizes results from behavioral neuroscience, electrophysiology, and neuroimaging to provide a detailed description of the neural circuits that facilitate the formation of grip patterns in human and nonhuman primates. NEUROSCIENTIST XX(X):xx–xx, XXXX. DOI: 10.1177/1073858407312080 KEY WORDS Reach-to-grasp, Functional imaging, Parietal cortex, Frontal cortex, Primary motor cortex, Transcranial magnetic stimulation
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, 2009
"... The topic of vision-based grasping is being widely studied using various techniques and with different goals in humans and in other primates. The fundamental related findings are reviewed in this paper, with the aim of providing researchers from different fields, including intelligent robotics and n ..."
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The topic of vision-based grasping is being widely studied using various techniques and with different goals in humans and in other primates. The fundamental related findings are reviewed in this paper, with the aim of providing researchers from different fields, including intelligent robotics and neural computation, a comprehensive but accessible view on the subject. A detailed description of the principal sensorimotor processes and the brain areas involved in them is provided following a functional perspective, in order to make this survey especially useful for computational modeling and bio-inspired robotic applications.
Departments of Psychology,
"... Dorsal posterior parietal cortex (PPC) has been implicated through single-unit recordings, neuroimaging data, and studies of brain-damaged humans in the spatial guidance of reaching and pointing movements. The present study examines the causal effect of single-pulse transcranial magnetic stimulation ..."
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Dorsal posterior parietal cortex (PPC) has been implicated through single-unit recordings, neuroimaging data, and studies of brain-damaged humans in the spatial guidance of reaching and pointing movements. The present study examines the causal effect of single-pulse transcranial magnetic stimulation (TMS) over the left and right dorsal posterior parietal cortex during a memory-guided ‘reach-to-touch ’ movement task in six human subjects. Stimulation of the left parietal hemisphere significantly increased endpoint variability, independent of visual field, with no horizontal bias. In contrast, right parietal stimulation did not increase variability, but instead produced a significantly systematic leftward directional shift in pointing (contralateral to stimulation site) in both visual fields. Furthermore, the same lateralized pattern persisted with left-hand movement, suggesting that these aspects of parietal control of pointing movements are spatially fixed. To test if the right parietal TMS shift occurs in visual or motor coordinates, we trained subjects to point correctly to optically reversed peripheral targets, viewed through a left-right Dove reversing prism. Following prism adaptation, the horizontal
NeuroImage 67 (2013) 283–297 Contents lists available at SciVerse ScienceDirect
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Contents lists available at ScienceDirect
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, 2014
"... doi: 10.3389/fnhum.2014.00676 An investigation of the neural circuits underlying reaching and reach-to-grasp movements: from planning to execution ..."
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doi: 10.3389/fnhum.2014.00676 An investigation of the neural circuits underlying reaching and reach-to-grasp movements: from planning to execution
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"... Man has always been fascinated by the hand and the brain that steers it. Aristotle was one of the earliest to record his admiration for the versatility of the human hand. “The hand can become a claw, a fist, a horn or spear or sword or any other weapon or tool. It can be everything because it has th ..."
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Man has always been fascinated by the hand and the brain that steers it. Aristotle was one of the earliest to record his admiration for the versatility of the human hand. “The hand can become a claw, a fist, a horn or spear or sword or any other weapon or tool. It can be everything because it has the ability to grasp anything or hold anything. ” The highly developed ability of the hand to grasp and manipu-late objects under precise visual control is one of the key features of the human motor system. The skilled use of the hand is fundamental to the technological, social, and cul-tural progress of the human species (Lemon 1993; Tallis 2004). In recent years, there have been significant advances in our understanding of the neural mechanisms underlying the transformation of visual information about an object in the
unknown title
"... Man has always been fascinated by the hand and the brain that steers it. Aristotle was one of the earliest to record his admiration for the versatility of the human hand. “The hand can become a claw, a fist, a horn or spear or sword or any other weapon or tool. It can be everything because it has th ..."
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Man has always been fascinated by the hand and the brain that steers it. Aristotle was one of the earliest to record his admiration for the versatility of the human hand. “The hand can become a claw, a fist, a horn or spear or sword or any other weapon or tool. It can be everything because it has the ability to grasp anything or hold anything. ” The highly developed ability of the hand to grasp and manipu-late objects under precise visual control is one of the key features of the human motor system. The skilled use of the hand is fundamental to the technological, social, and cul-tural progress of the human species (Lemon 1993; Tallis 2004). In recent years, there have been significant advances in our understanding of the neural mechanisms underlying the transformation of visual information about an object in the
