The operation of distributing attention to regions of the visual field was investigated in order to further understand the role of attention in the perception of visually-presented stimuli. In each of three experiments, a target letter was presented somewhere within a precued region of the visual display. The task was to determine which one of two possible targets had been presented. The size of the to-be-attended region of the display, the degree of target eccentricity within each region, and the perceptual difficulty of the stimulus discrimination were manipulated factorially. There was evidence that subjects were able to distribute their attention to regions of varying size, but that the focus of attention could not be confined within the boundaries of a non-circular display region. The size of the region to which attention was distributed was related to the speed and accuracy of responses to attended stimuli. However, the size of the display did not interact with either perceptual difficulty or target eccentricity. The interpretation that is consistent with these findings is that attention facilitates the localization of a visual stimulus rather than affecting the rate at which a stimulus is processed. Consequently, the operation of localizing a stimulus can occur more efficiently when attention is focused on a smaller region of a visual display than on a larger region.

No description available.

Man's ability to change an agricultural landscape to suit his own needs is associated with the basic principles that govern all landscapes. This study incorporates several environmental and cultural variables to help explain the resultant woodlots patterns in rural Delaware County, Indiana. To a large degree, cultural variables are deemed most significant in describing the size and locations of agriculturally oriented woodlots in Delaware County.Agriculture in Delaware County ranks high in productivity when compared with the entire state. Most of the farming is now specialized, such as dairy farms and cash-grain farms, with small family farms decreasing in number. As a result, fields are being combined, enlarged, and intensified leaving woodlots in remote, distant locations. Agricultural land use, comprising about 85 percent of the total area in the county, is viewed as the primary culprit controlling the pattern of .woodlots existing today. This study attests to quantify the governing parameters of agriculturally oriented woodlots in order to describe their size and location in Delaware County, Indiana, in 1980.

Tübingen, Universiẗat, Diss., 2007.

Thesis (MFA)--Rochester Institute of Technology, 1989. / Includes bibliographical references.

Universiẗat, Diss--Köln, 2004.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 2008. / Title from electronic submission form. Abstract. Includes bibliographical references.

Univ., Diss./97--München, 1996.

Thesis (M.S.)--West Virginia University, 1998. / Title from document title page. Document formatted into pages; contains v, 75 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 51-54).

Inaug.-Diss.--Kiel. / Vita. "Diese Arbeit erscheint gleichzeitig in den Schriften der Vereins für schleswig-holsteinische Kirchengeschichte, II. Reihe, V. Band, l. Heft." Bibliography: p. [v]-vi.