Are We Asking the Right Questions? Comments on Instructions in Cartographic Psychophysical Studies
Authors: Shortridge, Barbara Gimla; Welch, Robert B.
Source: Cartography and Geographic Information Science, Volume 7, Number 1, April 1980 , pp. 19-23(5)
Abstract:Specific instructions in psychophysical studies can be very influential upon results. Subjects in the present study were asked to distinguish between two solid black dots on a map on the basis of one of three sets of instructions. Under Condition 1 they were forced to choose one or the other of the dots as larger. Under Condition 2 they were allowed, in addition, to respond "Same." Finally, under Condition 3 they were led to expect that some answers should be "Same." A larger physical difference between dots was necessary with each successive condition before subjects could consistently detect the difference. These results fit well within the framework of signal detection theory, according to which a subject's responses are determined by his decision criterion (as well as perceptual sensitivity). It is recommended that test instructions attempt to elicit a decision criterion similar to that in effect during actual map reading.
Document Type: Research article
Publication date: 1980-04-01
- Cartography and Geographic Information Science (CaGIS) is the official publication of the Cartography and Geographic Information Society. CaGIS supports research, education, and practices that improve the understanding, creation, analysis, and use of maps and geographic information. The society serves as a forum for the exchange of original concepts, techniques, approaches, and experiences by those who design, implement, and use geospatial technologies through the publication of authoritative articles and international papers. The role of the CaGIS journal is to facilitate these objectives by disseminating results and reports in these areas of interest.
Cartography and Geographic Information Science (CaGIS) is now being published by Taylor & Francis as of 2013. Please visit the Journal's website at www.tandfonline.com/tcag or contact firstname.lastname@example.org to subscribe and obtain online access.
- Editorial Board
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- CaGIS publications
- NIH sponsored research - Policy
- ingentaconnect is not responsible for the content or availability of external websites