From inference to affordance : the problem of visual depth-perception in the optical writings of Descartes, Berkeley, and Gibson

This thesis explores the debate and issues regarding the status of visual ;,iferellces in the optical writings of Rene Descartes, George Berkeley and James 1. Gibson. It gathers arguments from across their works and synthesizes an account of visual depthperception that accurately reflects the larger, metaphysical implications of their philosophical theories. Chapters 1 and 2 address the Cartesian and Berkelean theories of depth-perception, respectively. For Descartes and Berkeley the debate can be put in the following way: How is it possible that we experience objects as appearing outside of us, at various distances, if objects appear inside of us, in the representations of the individual's mind? Thus, the Descartes-Berkeley component of the debate takes place exclusively within a representationalist setting. Representational theories of depthperception are rooted in the scientific discovery that objects project a merely twodimensional patchwork of forms on the retina. I call this the "flat image" problem. This poses the problem of depth in terms of a difference between two- and three-dimensional orders (i.e., a gap to be bridged by one inferential procedure or another). Chapter 3 addresses Gibson's ecological response to the debate. Gibson argues that the perceiver cannot be flattened out into a passive, two-dimensional sensory surface. Perception is possible precisely because the body and the environment already have depth. Accordingly, the problem cannot be reduced to a gap between two- and threedimensional givens, a gap crossed with a projective geometry. The crucial difference is not one of a dimensional degree. Chapter 3 explores this theme and attempts to excavate the empirical and philosophical suppositions that lead Descartes and Berkeley to their respective theories of indirect perception. Gibson argues that the notion of visual inference, which is necessary to substantiate representational theories of indirect perception, is highly problematic. To elucidate this point, the thesis steps into the representationalist tradition, in order to show that problems that arise within it demand a tum toward Gibson's information-based doctrine of ecological specificity (which is to say, the theory of direct perception). Chapter 3 concludes with a careful examination of Gibsonian affordallces as the sole objects of direct perceptual experience. The final section provides an account of affordances that locates the moving, perceiving body at the heart of the experience of depth; an experience which emerges in the dynamical structures that cross the body and the world.

Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics

Transverse, subglacial bedforms (ribbed moraines) occur frequently in southern Keewatin, Nunavut, Canada, where they record a complex glacial history, including shifting centers of ice dispersal and fluctuating basal thermal regimes. Comprehensive mapping and quantitative morphometric analysis of the subglacial bedform archive in this sector reveals that ribbed moraines are spatially clustered by size and assume a broad range of visually distinct forms. Results suggest that end-member morphologies are consistent with a dichotomous polygenetic origin, and that a continuum of forms emerged through subsequent reshaping processes of variable intensity and duration. Translocation of mobile, immobile and quasi-mobile beds throughout the last glacial cycle conditioned the development of a subglacial deforming bed mosaic, and is likely responsible for the patchy zonation of palimpsest and inherited landscape signatures within this former core region of the Laurentide Ice Sheet. Comparison against field evidence collected from central Norway suggests that bedforming processes can be locally mediated by pre-existing topography.

Camp Niagara Field Site States Forms from July to October 1916

A set of forms which was held together by a string. The title page is brittle and crumbling. Each page is dated and signed either by the Colonel or Lieutenant Colonel A.A.G. [Assistand Adjutant General] Niagara.

Emancipatory pedagogies in a grade 11 social studies classroom

This study aimed to uncover the incorporation of transformative pedagogies into the social studies curriculum. This educational approach aims to educate students about a variety of forms of oppression based on race, gender, sexuality, class, ethnicity, and culture, through the use of dialogue to uncover the students' understanding and personal experience with these concepts. This study examined the impact of discussing these topics in a grade 11 class of 22 White students (of various cultural, ethnic, and religious backgrounds). The teacher, Kelvin, and two of his students were interviewed and his class was observed on four occasions over a 2-week period. Based on the data I collected, I argue that a range of emancipatory teaching approaches should be used in critical classroom discourse. These different approaches emphasize the importance of critical thinking, the ability to recognize and combat oppression, the understanding and respect of different cultures, and the ability to recognize the impact of gender and sexuality on the past and present. These are life skills that extend beyond the curriculum (Freire, 1970; Giroux, 1988; hooks, 1994). This study fills a theory to practice gap in the research literature on transformative practice within Canadian contexts. The findings are important for several reasons. Firstly, they illustrated how the teacher's ideology and personal history affect hislher teaching and learning philosophies and approach to teaching. This has implications for the overall classroom environment, what students learn, and how teachers are trained. Secondly, this study provided a glimpse of what transformative pedagogy could look like from a pragmatic standpoint and demonstrated the complexity of using these multiple approaches in the classroom.

Indenture between William and Ann Waters and William B. Winterbottom

Indenture of mortgage with dower between William and Ann Waters of Niagara to William B. Winterbottom of Niagara regarding the easterly half of Lot no. 265 in Niagara. This was recorded in the Register of Forms of Niagara on April 13, 1850, Book A, folios 207-208 - instrument no. 2093, April 1, 1850.