2 edition of Cerebral localization and function of motion preception and smooth pursuit in humans found in the catalog.
Cerebral localization and function of motion preception and smooth pursuit in humans
Jason J. S. Barton
Written in English
|The Physical Object|
|Number of Pages||202|
Previous studies of pursuit of apparent motion in humans have found seemingly normal pursuit for values of Δt up to ms, which produced large initiation deficits in our monkeys (Fetter and Buettner ; Morgan and Turnbull ; Schor et al. ; Van der Steen et al. ). However, these studies employed either continuously moving or low Cited by: generate appropriate smooth pursuit eye movements. Keywords Smooth pursuit Prediction Periarcuate cortex Frontal eye fields Visual motion Introduction With the development of the high acuity fovea in pri-mates, smooth pursuit eye movements have evolved to track an interesting object that moves slowly across the visual field. The.
Neural basis of human visual motion perception Alex Huk Neurobiology & Center for Perceptual Systems UT-Austin. Neural basis of motion perception Cognitive How is this sensory evidence accumulated, remembered, and combined with other information to guide behavior? SensoryFile Size: 8MB. AUTOMATED PARCELLATION ON THE SURFACE OF HUMAN CEREBRAL CORTEX GENERATED FROM MR IMAGES by Wen Li An Abstract Of a thesis submitted in partial ful llment of the requirements for the Doctor of Philosophy degree in Biomedical Engineering in the Graduate College of The University of Iowa May Thesis Supervisor: Associate Professor .
The parallel visual motion inputs into areas VI and V5 of human cerebral cortex D. H. ffytche1, C. N. Guy2 and S. Zeki1 department of Anatomy, University College London and 2Blackett Laboratory, Physics Department, Imperial College, London, UK Correspondence to: Dr D. H. ffytche and Professor S. Zeki, Department of Anatomy and Developmental. motion in a given direction, with other directions of motion giving little or no responsei. It is estimated that about one-third of cells in primary visual cortex of the macaque monkey fall in the DS category,18 and these cells tend to congregate in the upper portions of cortical layer 4 (whichCited by: 8.
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We tested motion perception and smooth pursuit in 26 patients with unilateral cerebral hemispheric lesions. We used random dot cinematograms to test motion direction discrimination. We measured pursuit gain as they followed a predictable sinusoidal target moving horizontally at three different frequencies, and an unpredictable horizontal step Cited by: Brain (),Directional defects in pursuit and motion perception in humans with unilateral cerebral lesions Jason J.
Barton,1 James. Although LM and AF had impaired smooth pursuit (Zihl et al., ), subjects with unilateral lesions impairing motion perception may have normal smooth pursuit, and conversely subjects with abnormal pursuit may have normal motion perception (Barton et al., a).
Many different aspects of motion perception can be tested. We investigated the relationship between compensation for the effects of smooth pursuit eye movements in localization and motion perception. Participants had to indicate the perceived motion direction, the starting point and the end point of a vertically moving stimulus dot presented during horizontal smooth pursuit.
The presentation duration of the stimulus was by: Motion cues serve many purposes in primate vision. Consequently, akinetopsia, a defect of movement perception due to cerebral lesions, would be expected to. Functional brain imaging and neurophysiological studies have defined motion sensitive visual area V5, frontal (FEF) and supplementary (SEF) eye fields as core cortical smooth pursuit regions.
In addition, a dense neural network is involved in the adjustment of an optimal smooth pursuit response by integrating also extraretinal by: ation between the processing of motion signals for smooth pursuit and perception in humans was also reported by Spering and Gegenfurtner ().
Velocities of smooth pursuit responses and perceived velocities of the pursuit targets were measured when either the pursuit target or a visual context surrounding the target brieﬂy changed its velocity.
Initiation of smooth-pursuit eye movements to first-order and second-order motion stimuli. Exp Brain Res –, Crossref PubMed ISI Google Scholar; Lisberger and Movshon Lisberger SG and Movshon JA. Visual motion analysis for pursuit eye movements in area MT of macaque monkeys.
J Neurophysiol –, Google Cited by: During fixation, the mean PSE was °/s (SEM = °/s), indicating that, on average, the motion appeared slightly faster than during smooth pursuit, as has been found previously (Fleischl, ; Mack & Herman, ), although this difference was not significant, paired t test: t(4) =p =and not of crucial interest for the Cited by: 3.
Both optokinetic nystagmus (OKN) and smooth-pursuit eye movements (SPEM) are subclasses of so-called slow eye movements. However, optokinetic responses are reflexive whereas smooth pursuit requires the voluntary tracking of a moving target. We used functional magnetic resonance imaging (fMRI) to determine the neural basis of OKN and SPEM, and to Cited by: This is presumably the case because the integration time for perception is longer than for pursuit.
A functional dissociation between the processing of motion signals for smooth pursuit and perception in humans was also reported by Spering and Gegenfurtner ().
Velocities of smooth pursuit responses and perceived velocities of the pursuit Cited by: 8. Functions of Motion Perception I. Functions of Motion Perception A.
Motion Helps Us Understand Events in Our Environment A We use information derived from motion perception to determine what is happening, where we are moving and how to interpret gestures A Motion Agnosia-the inability to perceive motion, cause by damage to an area in the cortex involved in motion.
1 2 Biological motion inﬂuences the visuomotor transformation for smooth 3 pursuit eye movements 4 Sébastien Coppe a, Jean-Jacques Orban de Xivrya,b, Marcus Missala, Philippe Lefèvrea,⇑ 5 a CESAME and IoNS, Université catholique de Louvain, Belgium 6 Q1 bBiomedical Engineering Department, Johns Hopkins University, Baltimore, MD, USA 7 8 10 article info 11.
Although this was based on our previous finding that these apparent motions induced distinct brain responses rather than smooth ones (Sofue et al., ), one may argue that our apparent motion stimuli could activate long-range motion mechanisms (Braddick, ) or the third-order motion detection system (Lu and Sperling, ; Lu and Sperling Cited by: components; smooth pursuit is normally interspersed with saccades of various sizes and velocities.
The performance of voluntary pursuit can be expressed in the distribution of position and velocity of the retinal image of the target as a function of time or in the amplitude ratio and phase shift between eye and target motion as a function of.
B) the tests that have been used to study testosterone and aggression in humans are markedly different from those used in other species. C) testosterone can be synthesized and act locally in particular brain structures, but studies of testosterone and human aggression have been based on general blood levels of testosterone.
Start studying Chapter 4 - psych. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The concept of "localization of function" can be traced back to Joseph Gall's theory of phrenology. The cerebral cortex in humans.
Structure from motion (SFM) refers to how humans recover depth structure from rotating objects. SFM from 1st order velocities. SFM from 2nd order optic flow and perspective effects. Surface slant from def.; Some authors report that for non-forntoparallel axes of rotation the perceived shape is distorted beyond a depth scaling factor.
The recognition of human brain to motion is a big problem, which has not been solved completely at present. It may not be a complete explanation of the high reliability of human brain for motion recognition just to explore the function of motion d.
the function of visual inputs is to produce smooth eye accel- eration or deceleration that corrects differences between target and eye motion (Lisberger et al.
The neural substrate for pursuit consists of visual input pathways to the cerebral cortex, cerebrocerebellar pathways. Sound localization is made possible through the activity of these brain stem structures. The vestibular system enters the brain stem and influences activity in the cerebellum, spinal cord, and cerebral cortex.
The visual pathway segregates information from the two eyes so that one half of the visual field projects to the other side of the brain.Purpose. This study presents a two-degree customized animated stimulus developed to evaluate smooth pursuit in children and investigates the effect of its predetermined characteristics (stimulus type and size) in an adult population.
Then, the animated stimulus is used to evaluate the impact of different pursuit motion paradigms in by: 1. The brain uses similar computations to calculate the direction and speed of objects in motion whether they are perceived visually .