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Perception of blackness as a training material for the Borg CR100 Scale®
Stockholm University, Faculty of Social Sciences, Department of Psychology.
2013 (English)In: Fechner Day 2013: Proceedings of the 29th Annual Meeting of the International Society for Psychophysics / [ed] Jiˇr´ı Wackermann, Marc Wittmann, Wolfgang Skrandies, Freiburg, Germany: International Society for Psychophysics , 2013, 98-98 p.Conference paper, Abstract (Other academic)
Abstract [en]

The Borg CR100 Scale® is a general intensity scale suitable formost kinds of experiences and symptoms. On the scale verbal labels are placed in congruence with a ratio scale from 0 (nothing at all) to 100 (“Maximal” and anchored in a previously experienced perception of, for example, perceived exertion), with, for example, “Strong” at 50 and with the possibility to exceed 100 in extreme situations. For instruction and training the blackness of 5x5 cm cardboard squares (varying from 5% to 95% blackness NCS) have previously been used with an exponent in the psychophysical power function of between 0.9 and 1.2 (obtained both for Magnitude estimation and previous versions of Borg CR scales). For practical reasons it is important to be able to use a Powerpoint presentation of blackness stimuli, for example when running classroom experiments. Two different randomized orders of 18 (2x9) blackness stimuli were presented in a classroom setting to 47 participants (16 men and 31 women, students of psychology). Microsoft Powerpoint for Apple was used with the 9 different greys preset in the program (5, 15, 25, 35, 50, 65, 75, 85, 95% blackness) and scaled with the Borg CR100!R  Scale. Two orders of presentation were used, the second being the reverse of the first. The responses obtained with the Borg CR100 scale!R  ranged from 2 to 90 (median values) showing that blackness worked well across the whole subjective dynamic range. This is of importance for a good training material. The group exponent, computed from geometric means, was n =  1. 3 (r =  0. 994) and thus a little higher than previously obtained. For a subgroup of 14 subjects who were retested after approximately 15 minutes the exponent for both occasions was n =  1. 1 (r =  0. 985 and r =  0. 965, respectively). From graphs it was obvious that there was a slight “dip” with relatively lower responses for 35%, 50% and 65% blackness, especially for the first presentation order. This might in part explain why the exponent was a little higher than obtained with the older cardboard presentations. If this “dip” was mainly due to design, the blackness stimuli, or the scale, remains to be tested. However, as a training material, this would have less consequence. As a conclusion, a Powerpoint presentation of blackness works well, and may be recommended as a training material for the Borg CR100 scale®.

Place, publisher, year, edition, pages
Freiburg, Germany: International Society for Psychophysics , 2013. 98-98 p.
Keyword [en]
blackness, psychophysical scaling, Borg CR100 Scale
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Research subject
URN: urn:nbn:se:su:diva-98791OAI: diva2:685460
Fechner Day 2013, Freiburg, Germany, October 21-25
Available from: 2014-01-09 Created: 2014-01-09 Last updated: 2014-03-04Bibliographically approved

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