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 36 for “"allocentric"”.
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Explicit Attention to Allocentric Landmarks Improves Memory-Guided Reaching
The presence of an allocentric landmark can have both explicit (instruction-dependent) and implicit influences on reaching performance However, it is not known how the instruction itself (to rely either on egocentric versus allocentric cues) influences memory-guided reaching. Here, 13 participants …
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Building an Allocentric Traveling-Direction Signal Via Vector Computation
… fan-shaped body that explicitly tracks a fly's allocentric traveling angle, that is, the traveling angle in reference to external cues. Past work has identified neurons in Drosophila and mammals that track an animal's heading angle referenced to external cues (e.g., head-direction cells), but …
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The Neural Correlates of Allocentric Spatial Memory in Schizotypy
In this thesis, allocentric spatial memory was investigated in healthy volunteers with average and high levels of schizotypal traits assessed using the Schizotypal Personality Questionnaire. Functional and structural MRI was used to investigate the neural correlates of allocentric spatial memory in …
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Converting an Allocentric Goal Direction into an Egocentric Steering Signal in Drosophila
… goal angles––both encoded in world-centred, or allocentric, coordinates––to generate a body-centred, or egocentric, steering signal. Past work has argued that the activity of EPG cells, or "compass neurons", represents the fly's moment-to-moment angular orientation, or heading angle, during …
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Allocentric Design: Critical Practice in the Age of Radical Technological and Environmental Change
… the penultimate chapter investigates how an allocentric framework can embrace the kind of ontological and epistemological pluralism that the advocates of Indigenous and non-Eurocentric design methodologies (such as Arturo Escobar) have called for, while retaining as part of this pluralism the …
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Allocentric spatial memory following anterior temporal lobectomy: A comparison between active and sedentary epileptic adults
The association between neural activity of the left hemisphere hippocampal region and verbal memory has been well established. Similarly, neuropsychological outcomes following left anterior temporal lobectomy (ATL) have been well documented, with deficits in the ability to learn new verbally …
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The use of landmark-based wayfinding strategies across the adult lifespan
… spatial knowledge and support navigation. Allocentric strategy use is associated with a cognitive representation of a learned environment that allows flexible navigation, while egocentric strategy use is associated with uni-directional knowledge that only supports accurate navigation in …
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Effects of 17β-estradiol on learning and memory and strategy use during a hole board spatial navigation task in aged male rats
… and memory as well as to promote the use of an allocentric strategy during spatial navigation. While the majority of research using 17β- estradiol has been done using females rodents, there have been studies showing an improvement in spatial learning and memory and promoted use of allocentric …
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Lost in trauma: post-traumatic stress disorder, spatial processing and the brain derived neutrophic factor gene.
… et al. (2015) demonstrated that in cases of PTSD allocentric processing was impaired. This thesis pursued this line of enquiry and assessed the impact of PTSD and of any trauma exposure on navigation performance using a static perspective taking task and a more ‘active’ navigation paradigm. The …
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Effects of Menstrual Cycle Phase and Stress on Spatial Navigational Strategy Use
… cycle phase and acute psychosocial stress on allocentric (i.e., relying on a cognitive map of the environment, created using distal cues), egocentricresponse (i.e., relying on body-turn directions), and egocentric-cue (i.e., relying on the location of specific proximal cues) navigation. The …
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Contributions of Motility to Large-scale Search and Navigation
… ability to reliably employ viewpoint invariant allocentric and viewpoint dependent egocentric cues. The ability to use these sources of information have been studied extensively in the human spatial cognition literature, largely on desktop PC platforms. Whilst this provides researchers with an …
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What spatial reference frame is used for priming in visual search?
… to the body or a specific part of the body) or allocentric (i.e. relative to other items in the display) frames of reference. However, it is unclear which of these are used in spatial priming. It was found that both allocentric and egocentric cues were used, and that egocentric cues were the …
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Neurobehavioural representations of observed action viewpoint
… reach height. Actions were observed from two allocentric viewpoints. The data revealed no differences between viewpoints, but did reveal effects of relative spatial direction congruency. Chapter 3 further examined these direction congruency effects. Using simple arm movements, observed task …
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Can the Tables Be Turned? Linking Racioethnicity, Leader -Member Exchange (Lmx) and Career Satisfaction
… Americans are high self-monitoring, or highly allocentric, they might be able to turn the tables and enjoy higher levels of LMX with their European American supervisors. The study also found a positive relationship between LMX and career satisfaction.
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Representation of Whole-body Navigation in the Primary Sensorimotor and Premotor Cortex
… areas in primates are likely involved in allocentrically representing body po-</p><p>sition in space during whole-body navigation, which is an unexpected finding</p><p>given the classical model of spatial processing that attributes the representation of</p><p>allocentric space to the …
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Reference frame definition, use, and interaction in spatial memory
… representations are independent from the self (allocentric or intrinsic). This research presents novel methods to assess spatial reference frame use in memory. Chapter 1 presents a framework for classifying reference frames. Specifically a distinction between reference direction and reference …
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A Behavioural, Molecular and Lesion Examination of Hippocampal Contributions to Morris Water Maze Acquisition
… thought to rely on retained representations of allocentric spatial relations, whereby animals learn to associate the location of a hidden platform with surrounding distal cues and subsequently use this information to navigate towards the hidden goal. As the distal cues are critical in this …
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Estrategias de atenuación en español L1 y L2 : estudio contrastivo en hablantes españoles y suecos
… our proposal, we therefore distinguish between allocentric mitigation (H and S face protection with politeness) and autocentric mitigation (S face protection without politeness). The empirical data is a selection of 34 conversations from Corpus AKSAM (Fant et alii 1996), split between four …
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Sign-Inverting Vectors Underlie a Coordinate Transformation in the Drosophila Central Brain
… activity yields the direction of wind in an allocentric reference frame — that is, relative to external landmarks like the sun, as opposed to relative to the animal's head. We also discovered that PFNa neurons alternate signaling modes to convey the forward and backward wind directions. Wind …
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Diazepam administration during acute thiamine deficiency attenuates subsequent neuropathology and spatial-memory deficits in rats
… of PTD. The present experiment assessed spatial allocentric working-memory in recovered PTD rats. Two groups of rats received PTD treatment; one group received diazepam (5mg/kg) upon the first sign of overt seizures in order to attenuate them until treatment reversal (Group PTD+DZ), and the other …
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