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Your search keyword '"Lindner, Axel"' showing total 2 results
Start Over Author "Lindner, Axel" Search Limiters Full Text Topic magnetic resonance imaging Publisher public library of science
2 results on '"Lindner, Axel"'

1. Human posterior parietal and dorsal premotor cortex encode the visual properties of an upcoming action

Author

Pilacinski, Artur, Wallscheid, Melanie, and Lindner, Axel

Subjects
Male, genetic structures, Eye Movements, Vision, Physiology, Visual System, Sensory Physiology, lcsh:Medicine, Social Sciences, Diagnostic Radiology, Mathematical and Statistical Techniques, Functional Magnetic Resonance Imaging, Parietal Lobe, Medicine and Health Sciences, Psychology, lcsh:Science, Musculoskeletal System, Cerebral Cortex, Brain Mapping, Radiology and Imaging, Statistics, Motor Cortex, Brain, Magnetic Resonance Imaging, Sensory Systems, Physical Sciences, Visual Perception, Sensory Perception, Female, Anatomy, psychological phenomena and processes, Research Article, Imaging Techniques, Cognitive Neuroscience, Movement, Prefrontal Cortex, Neuroimaging, Research and Analysis Methods, behavioral disciplines and activities, Diagnostic Medicine, Reaction Time, Humans, Statistical Methods, Vision, Ocular, Analysis of Variance, lcsh:R, Biology and Life Sciences, Cognitive Science, lcsh:Q, Mathematics, Photic Stimulation, Psychomotor Performance, Neuroscience
Abstract

Behavioral studies show that motor actions are planned by adapting motor programs to produce desired visual consequences. Does this mean that the brain plans these visual consequences independent of the motor actions required to obtain them? Here we addressed this question by investigating planning-related fMRI activity in human posterior parietal (PPC) and dorsal premotor (PMd) cortex. By manipulating visual movement of a virtual end-effector controlled via button presses we could dissociate motor actions from their sensory outcome. A clear representation of the visual consequences was visible in both PPC and PMd activity during early planning stages. Our findings suggest that in both PPC and PMd action plans are initially represented on the basis of the desired sensory outcomes while later activity shifts towards representing motor programs.

Published
2018

2. Motor Preparatory Activity in Posterior Parietal Cortex is Modulated by Subjective Absolute Value.

Author

Iyer, Asha, Lindner, Axel, Kagan, Igor, and Andersen, Richard A.

Subjects
*BRAIN function localization, *BRAIN imaging, *BRAIN research, *MAGNETIC resonance imaging, *REACTION time, *MOTOR ability
Abstract

For optimal response selection, the consequences associated with behavioral success or failure must be appraised. To determine how monetary consequences influence the neural representations of motor preparation, human brain activity was scanned with fMRI while subjects performed a complex spatial visuomotor task. At the beginning of each trial, reward context cues indicated the potential gain and loss imposed for correct or incorrect trial completion. FMRI-activity in canonical reward structures reflected the expected value related to the context. In contrast, motor preparatory activity in posterior parietal and premotor cortex peaked in high ''absolute value'' (high gain or loss) conditions: being highest for large gains in subjects who believed they performed well while being highest for large losses in those who believed they performed poorly. These results suggest that the neural activity preceding goal-directed actions incorporates the absolute value of that action, predicated upon subjective, rather than objective, estimates of one's performance. [ABSTRACT FROM AUTHOR]

Published
2010
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