health sciences, history THE CANADIAN HISTORICAL REVIEW utpjournals.press/chr Offering a comprehensive analysis on the events that have shaped Canada, CHR publishes articles that examine Canadian history from both a multicultural and multidisciplinary perspective.

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The role of attentional mechanisms in memory search was investigated in 2 experiments. In Experiment 1, an abrupt-onset cue was a valid or invalid predictor of a spatially displaced memory probe in a memory search paradigm. The 2 conditions differed only in terms of the duration of the memory probe: either 200 ms or an unlimited duration until the subject’s response. We found that memory probe duration had little impact on memory search, as revealed by the slope across memory set size, although an invalid prior cue slowed responding by increasing the intercept by about 70 ms. In Experiment 2, costs and benefits of valid and invalid cues were assessed by inclusion of a neutral condition. Both costs and benefits were found, with effects again localized in the intercept of the memory search functions. A simple model was proposed that estimated 2 attentional transit times, 1 to the abrupt-onset cue and 1 activated after disengagement from an invalid location. We address whether the rapid examination of the contents of working memory should be considered an encapsulated process, unperturbed by abrupt-onset events that delay but do not otherwise disturb the resulting search.

The contour map is, by far, the most common display mode for geophysical and geological data. With the increasing use of computers in geophysical data analysis, the demand for computer contoured maps is rapidly growing. Computer contouring has been available on a fairly routine basis for about ten years (see, for example, Dayhoff, 1963), but in spite of this, much programming effort (and money) is still being devoted to the research and development of new contouring programs. The main reason for this continuing research is the failure of previous effort to establish an interpolation technique for irregularly spaced data which gives consistently "good" results, under what- ever definition of "good" is applied. The purpose of this note is to describe the directions of some recent research into the contouring problem, and hopefully to suggest in which direction the ultimate solution may lie.

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