Task switching produces a number of reliable behavioural measures, the main focus of interest here being 'switch cost', the increase in response time when switching between tasks as opposed to performing them separately. Switch costs are typically measured between two tasks and compared to a single-task repeat condition. Current explanations of switch cost fall broadly into either active reconfiguration based accounts (e.g. Rogers & Monsell, 1995) whereby the extra time taken to switch between tasks is attributable to reconfiguration of task set, or passive carryover accounts (Allport, Styles & Hsieh, 1994) where extra time is accrued by the need to overcome conflict between the current task set and the enduring activity of the previous task set. This thesis used the Continuous Series II (Gurd, 1995), a novel continuous verbal switching task which requires individuals to switch continuously between increasing numbers of overlearned sequences (e.g. days, numbers). The aim was to investigate the application of general (whole-task) switch costs (RT costs), memory-based switching and the differential pattern of errors produced by the task, with a view to determining the most appropriate theoretical model to explain costs in the task. General switch costs are measured over the whole time course of the task from beginning to end, instead of the more usual measurement of switch cost over a single switch or repeat within the whole task. Such long-term measures of switch cost account for 'global representational structures' in the task, which are said to contribute to the cost of switching yet are absent from local transitional measures (Kleinsorge, Heuer & Schmidtke, 2004). Global representational structures account for not only the current and preceding trials actually performed but also the possible alternatives for the preceding, current and subsequent trials, thereby reflecting all representations relating to performance of the tasks. The Continuous Series II (Gurd, 1995) measures costs continuously over time between increasing numbers of verbal tasks and as yet has not been linked to either a reconfiguration or carryover-based account. Initial administration to healthy controls and neurological patients confirmed difficulty-related increasing costs and revealed a dissociation of errors between two versions of the task, one including semantic categories. This suggested differential sources of control overseeing conflict detection and resolution, linked in this work to Kahneman's dual system model (Kahneman, 2011) and suggesting the implication of active control. Further work with monozygotic twins mirrored for handedness revealed no predicted effect of handedness but did reveal the employment of vocalised inner-speech as a successful self cueing device, known to be supportive of active reconfiguration in switching (Monsell, 2005). Such cueing was employed by this sample of older adults but had not appeared to benefit the neurological patients who clearly had reconfiguration deficits. Further development of the two versions of the task also allowed rejection of a passive carryover explanation of switch-cost on the basis that switching to the easier task was not more difficult, counter to the prediction of Allport, Styles & Hsieh (1994). At this stage it was evident that some portion of general cost for the task may be artefactual, as participants displayed behaviour suggesting the order of tasks and their updating nature (task content) may be inflating cost beyond a pure measure of switching (an inevitable risk of general switch cost measurement). Investigation of task order showed that production of the category 'days' appeared to conflate sources of error. Reducing the difficultly of component tasks (removing the need to update items) demonstrated that a substantial proportion of general cost was indeed purely switch-related. Returning to the question of cueing (previously demonstrated to be beneficial when self-generated), the final study introduced explicit external cues, consistently predicted to benefit switching (Monsell, 2005). These cues did not reduce time costs in verbal task switching and furthermore failed to prevent errors of task order. The lack of external cue benefit supports an amended version of the Rogers & Monsell (1995) task-set reconfiguration model as the best explanation of switch costs in verbal task-switching. This amended model relies entirely on internally generated representations in a closed system and supports the role of active control in generating switch-cost. General cost, while incorporating task-related artefacts, rehearsals and error recovery, nevertheless has at its core a switch related element. Furthermore, the failure of cues to extinguish between-task errors negates excessive reliance on working memory and further supports the rejection of passive carryover accounts of task switch cost.

It is argued in Chapters 1 to 4 that in cognitive psychology in general, and in the disciplines of language acquisition and cognitive development in particular, there is substantial benefit to be derived from distinguishing between two representational systems, one system being deployed in long-established or highly-practiced functions, and the second deployed in novel tasks, or where difficulties interrupt the first system. It is also argued that the proper subject of cognitive development is the second of these systems. Chapters 5 and 6 are concerned in different ways with the origins of language in the individual, in particular with the question of what innate knowledge of language might be justified. It is concluded that many questions regarding innate knowledge remain open, and that a source in human evolution for knowledge of language is no more likely than sources in individual or social development. In Chapter 7 it is argued that representational drawing emerges late in the 4th year of life, and some new techniques are described for studying early representational drawing. Following these treatments of external systems of representation, Chapter 8 offers a general developmental theory of forms of representation, extending Piaget's insight that mental representation is co-extensive with thought, and that the main axis of cognitive development is the content of thought and representation. Chapters 9 to 12 apply this theory to the representation of belief and desire, and of extrinsic and intrinsic qualities of objects, by 11/2 to 4 year-old children. Chapter 13 introduces a new method for analyzing the free classification task, a task sometimes used to assess children's ability to think about intrinsic qualities, and applies this method to various data sets. Chapter 14 applies these insights and results to the problem of characterizing concepts and concept development and favourably discusses the idea that more precise knowledge of this aspect of development may help to explain certain features of early language acquisition.

Thesis (Ph.D.)--Syracuse University, 2008. / "Publication number: AAT 3333576."

Thesis (Ph. D.)--University of Oregon, 2006. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 235-258). Also available for download via the World Wide Web; free to University of Oregon users.

No description available.

Philosophy and Magic share a common root that goes back twenty thousand years to the role of the shaman in the village and his attempt to enact control over the surrounding forces of nature through ritual performance. During Greek and Roman times, philosophy leaves magic and religion as it turns towards language in order to bring understanding. In modern times, philosophy is mired in language games and has lost the practical power it once held to transform lives. In the first section of this thesis we will look at the history of magic and philosophy and how the two have changed over time. In the second section, we will examine the feeling of wonder and how being left speechless after witnessing a magic effect calls back to a simpler time in our lives before the existence of language. Throughout the thesis, we will examine the psychological, anthropological, archetypal, neurological and linguistic links that arise between the two professions. Finally, if magic and philosophy are still to be relevant today, we will look at the role that magic plays in the psyche of an educated society and we will consider how-by learning to think like magicians-philosophers and the practice of philosophy can be stronger and more useful in today's modern world.

For the first time a representative Theory of Mind (ToM) scale (Wellman &amp / Liu, 2004) has been cast into three different linguistic forms in order to show the impact of evidential markers on ToM understanding. With Turkish children, we studied (i) a control form without explicit evidential markers, as conducted by Bayramoglu &amp / Hohenberger (2007), (ii) a verbal form with &ndash / DI (marking factuality in the past ) and (iii) a verbal form with &ndash / MIS (marking hearsay in the past). To predict ToM performance of children, we also conducted a working memory task and two language tasks for complex syntax understanding. Our analysis showed that Turkish children, ranging from 4 to 7 years of age, performed significantly better with the form &ndash / DI than the control form. Also one of the language tasks which measures relative clause understanding was found to be a significant predictor of ToM performance. We conclude that evidential markers may help Turkish children in their online reasoning of ToM. We think that the relation between evidentiality and ToM may be understood clearer with cross-linguistic studies by varying the presence of evidentials and also their linguistic properties (i.e. lexical or morphological) while controlling the materials across languages. Theory of Mind (ToM), Evidentiality, ToM scale, Cognitive Development, Language.

Thesis (Ph. D.)--University of Missouri-Columbia, 1994. / Permission to use letters at end of volume 2. Typescript. Vita. Includes bibliographical references (leaves 462-595). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 1994. / Permission to use letters at end of volume 2. Typescript. Vita. Includes bibliographical references (leaves 462-595). Also available on the Internet.

Thesis (M.A.)--Miami University, Dept. of Speech Pathology and Audiology, 2006. / Title from first page of PDF document. Includes bibliographical references (p. 41-49).