Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 70 for “"Parietal Cortex"”.
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Fronto-parietal cortex in sequential behaviour
This dissertation investigates the fronto-parietal representation of the structure of organised mental episodes by studying its effect on the representation of cognitive events occurring at various positions within it. The experiments in chapter 2 look at the completion of hierarchically organized …
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Competition between visual stimuli in the monkey parietal cortex
… neural representations of visual stimuli in the parietal cortex may be implemented by changes in the activity and reliability of neural signals. The macaque lateral intraparietal area (LIP) is part of an oculomotor attentional network and its activity represents the relative priority of spatial …
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On the posterior parietal cortex and saccadic eye movements
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1991.
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Spatial perception and movement planning in the posterior parietal cortex
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1994.
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Unique and shared roles of the prefrontal and posterior parietal cortex in cognitive functions
The dorsolateral prefrontal cortex and the posterior parietal cortex are parts of the cortical network involved in attention, working-memory and executive function. The two areas share a number of similarities, although functional differences between the two have also been identified. A widely …
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Joint Representation of Translational and Rotational Components of Self-Motion in the Parietal Cortex
… single units in the macaque ventral intraparietal area (VIP) to understand the role of visual cues in decomposing optic flow and jointly representing both the T and R components. Through the following studies, we establish that the visual system can rely on purely visual cues to derive the …
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The Role of the Posterior Parietal Cortex in Subjective and Objective Episodic Memory Recollection
… Models. The AtoM model proposes that the ventral parietal cortex (VPC) and dorsal parietal cortex (DPC) are responsive to bottom-up and top- down attention to memory, respectively, (Cabeza, 2008; Cabeza et al., 2008; Ciaramelli et al., 2008). The EB model, on the other hand, proposes that the VPC …
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NEURAL SIGNALS UNDERLYING COORDINATE FRAME OF ATTENTION IN AREA 7a OF PRIMATE POSTERIOR PARIETAL CORTEX
The posterior paritetal cortex is recognized as an association area that amalgamates sensory information and transforms it into signals enabling the coordination of motor actions. The allocation of visual attention is a necessary part of this process and posterior parietal area 7a is one of the …
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Comparison of frontal and parietal cortices in the control of visual attention
… of attentional control. Both the prefrontal and parietal regions are implicated as the source of this control. In order to investigate their relative roles we recorded simultaneously from both parietal cortex (specifically, the lateral intraparietal cortex) and prefrontal cortex (specifically, …
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Brain stimulation reveals neural mechanisms of stereopsis
… mechanisms of stereopsis within the visual cortex. As a first step, I conducted a proof of concept study to confirm where in the visual cortex TMS can be used to study perception. I systematically mapped out where in the visual cortex TMS triggers self-propagating, perceptually noticeable …
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Visual Perception in Children with Spina Bifida Myelomeningocele and the Impact of Posterior Cortical Changes
… to controls in regions of interest (inferior parietal cortex, superior parietal cortex, middle temporal gyrus, and superior temporal gyrus). There were no relations of corpus callosum volumes to visual perception performance, but relations were noted for cortical thickness, gray matter volume, …
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PERSISTENT ACTIVITY DURING WORKING MEMORY: MATURATION AND CORTICAL SPECIALIZATION
… cognitive functions and dorsolateral prefrontal cortex (dlPFC) has generally been recognized as the seat of working memory. Development of working memory ability through adolescence, accompanied by structural changes has been reported in human studies, however, how neurophysiological changes in …
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The Impact of Motivation on Object-Based Visual Attention Indexed by Continuous Flash Suppression.
… insula, left frontal eye fields, left inferior parietal cortex, and early visual cortex. Using the more robust technique, continuous flash suppression, in Chapter 4, we find no differentiation between stimuli based on mean amygdala responses. However, we show increased connectivity between the …
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Neurale Grundlagen zeitlicher und räumlicher Aufmerksamkeitsprozesse für komplexe, objektbezogene Handlungen
… increased neural activity in the right posterior parietal cortex. Furthermore, a significant interaction of ERROR and STIMULUS was revealed for the right inferior parietal cortex. In the second experiment the experimental design was used as a clinical test of patients with unilateral brain …
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Cortical Mechanisms for Transsaccadic Perception of Visual Object Features
… updating of object orientation in specific intraparietal (i.e., supramarginal gyrus, SMG) and extrastriate occipital (putative V4) regions. Based on these findings, I hypothesized that transsaccadic perception may rely on a single cortical mechanism. In this dissertation, I first investigated …
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Commonalities And Differences In Visual And Auditory Multistability
… was used to investigate whether the superior parietal cortex is causally involved in both visual and auditory multistability as a top-down mechanism. Transcranial magnetic stimulation on the anterior and posterior superior parietal cortex did not increase or decrease the median phase durations …
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Parietal contributions to visual working memory depend on task difficulty
The nature of parietal contributions to working memory (WM) remain poorly understood but of considerable interest. We previously reported that posterior parietal damage selectively impaired WM probed by recognition (Berryhill & Olson, 2008a). Recent studies provided support using a neuromodulatory …
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A multimodal investigation in eye movements
… the frontal eye fields (FEFs), the posterior parietal cortex (PPC), and the cerebellar vermis (CV); (2) significantly more functional activity and task-modulated coactivation would be observed in binocularly normal controls (BNCs) compared with convergence insufficiency (CI) subjects; and (3) …
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EFFECTS OF ALCOHOL AND ACAMPROSATE, AN ALCOHOL USE DISORDER TREATMENT, ON NONHUMAN PRIMATE BEHAVIOR AND MEMORY
… including structures such as the prefrontal cortex, posterior parietal cortex and others. Many drugs are used in the treatment of AUD, with acamprosate being one of the most commonly prescribed drugs. The specific mechanism of acamprosate has not been identified, but it is thought to have an …
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The Neural Correlates of Spatial Language
… revealed that a specific region in bilateral parietal cortex, the precuneus, was significantly active during spatial language processing. In a second experiment, there was a significant difference in the stroke population, with patients being more likely to perform better on the spatial …
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