Browsing by Author "Sommer, Marc A"
Now showing items 1-20 of 52
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A pathway in primate brain for internal monitoring of movements.
(Science, 2002-05-24)It is essential to keep track of the movements we make, and one way to do that is to monitor correlates, or corollary discharges, of neuronal movement commands. We hypothesized that a previously identified pathway from brainstem ... -
Activity of neurons in monkey globus pallidus during oculomotor behavior compared with that in substantia nigra pars reticulata.
(J Neurophysiol, 2010-04)The basal ganglia are a subcortical assembly of nuclei involved in many aspects of behavior. Three of the nuclei have high firing rates and inhibitory influences: the substantia nigra pars reticulata (SNr), globus pallidus ... -
Advances in understanding mechanisms of thalamic relays in cognition and behavior.
(J Neurosci, 2014-11-12)The main impetus for a mini-symposium on corticothalamic interrelationships was the recent number of studies highlighting the role of the thalamus in aspects of cognition beyond sensory processing. The thalamus contributes ... -
An experimental and computational framework for modeling multi-muscle responses to transcranial magnetic stimulation of the human motor cortex.
Current knowledge of coordinated motor control of multiple muscles is derived primarily from invasive stimulation-recording techniques in animal models. Similar studies are not generally feasible in humans, so a modeling ... -
Application of long-interval paired-pulse transcranial magnetic stimulation to motion-sensitive visual cortex does not lead to changes in motion discrimination.
(Neuroscience letters, 2020-05-12)The perception of visual motion is dependent on a set of occipitotemporal regions that are readily accessible to neuromodulation. The current study tested if paired-pulse Transcranial Magnetic Stimulation (ppTMS) could modulate ... -
Beyond the labeled line: variation in visual reference frames from intraparietal cortex to frontal eye fields and the superior colliculus
(Journal of Neurophysiology, 2017-12-20)We accurately perceive the visual scene despite moving our eyes ~3 times per second, an ability that requires incorporation of eye position and retinal information. In this study, we assessed how this neural computation ... -
Brain circuits for the internal monitoring of movements.
(Annu Rev Neurosci, 2008)Each movement we make activates our own sensory receptors, thus causing a problem for the brain: the spurious, movement-related sensations must be discriminated from the sensory inputs that really matter, those representing ... -
Circuits for Presaccadic Visual Remapping.
(J Neurophysiol, 2016-09-21)Saccadic eye movements rapidly displace the image of the world that is projected onto the retinas. In anticipation of each saccade, many neurons in the visual system shift their receptive fields. This presaccadic change ... -
Cognitive control of movement via the cerebellar-recipient thalamus.
(Front Syst Neurosci, 2013-10-01)The cognitive control of behavior was long considered to be centralized in cerebral cortex. More recently, subcortical structures such as cerebellum and basal ganglia have been implicated in cognitive functions as well. ... -
Contribution of Cerebellar Loops to Action Timing.
(Curr Opin Behav Sci, 2016-04)Recent studies of sensorimotor processing have benefited from decision-making paradigms that emphasize the selection of appropriate movements. Selecting when to make those responses, or action timing, is important as well. ... -
Corollary discharge across the animal kingdom.
(Nat Rev Neurosci, 2008-08)Our movements can hinder our ability to sense the world. Movements can induce sensory input (for example, when you hit something) that is indistinguishable from the input that is caused by external agents (for example, when ... -
Corollary discharge circuits for stabilizing visual perception
(PSYCHOPHYSIOLOGY, 2009-09) -
Corollary discharge circuits in the primate brain.
(Curr Opin Neurobiol, 2008-12)Movements are necessary to engage the world, but every movement results in sensorimotor ambiguity. Self-movements cause changes to sensory inflow as well as changes in the positions of objects relative to motor effectors ... -
Delay activity of saccade-related neurons in the caudal dentate nucleus of the macaque cerebellum.
(J Neurophysiol, 2013-04)The caudal dentate nucleus (DN) in lateral cerebellum is connected with two visual/oculomotor areas of the cerebrum: the frontal eye field and lateral intraparietal cortex. Many neurons in frontal eye field and ... -
Division of labor in frontal eye field neurons during presaccadic remapping of visual receptive fields.
(J Neurophysiol, 2012-10)Our percept of visual stability across saccadic eye movements may be mediated by presaccadic remapping. Just before a saccade, neurons that remap become visually responsive at a future field (FF), which anticipates the saccade ... -
Drivers from the deep: the contribution of collicular input to thalamocortical processing.
(Prog Brain Res, 2005)A traditional view of the thalamus is that it is a relay station which receives sensory input and conveys this information to cortex. This sensory input determines most of the properties of first order thalamic neurons, ... -
Dynamics of visual receptive fields in the macaque frontal eye field.
(J Neurophysiol, 2015-12)Neuronal receptive fields (RFs) provide the foundation for understanding systems-level sensory processing. In early visual areas, investigators have mapped RFs in detail using stochastic stimuli and sophisticated analytical ... -
Frontal eye field neurons assess visual stability across saccades.
(J Neurosci, 2012-02-22)The image on the retina may move because the eyes move, or because something in the visual scene moves. The brain is not fooled by this ambiguity. Even as we make saccades, we are able to detect whether visual objects remain ... -
Frontal eye field neurons with spatial representations predicted by their subcortical input.
(J Neurosci, 2009-04-22)The frontal eye field (FEF) is a cortical structure involved in cognitive aspects of eye movement control. Neurons in the FEF, as in most of cerebral cortex, primarily represent contralateral space. They fire for visual ...
