Abstract
Five observers performed absolute magnitude estimation (AME) and absolute magnitude production (AMP) of line lengths and vibrotactile pulse and sine loudnesses as well as matching of each possible pair. Line lengths, presented visually, could extend over a 7‐ to 950‐mm range. Vibrotactile stimuli were 32‐pps haversine pulses and 250‐Hz sinusoids presented to the palm with 7‐mm diameter contactors and static surrounds. When the AME and AMP data were plotted together, perfect correlation was not seen indicating the influence of regression effects on the data. Regression effects occur when observers making judgments on two perceptual continua (i.e., line magnitude and number magnitude) restrict the range of their responses gravitating toward the mean response. Magnitude balance functions (MB) were calculated from AME and AMP data for the line, sine, and pulse. The cross‐modality matches, made with each stimulus type serving as the standard, showed similar regression effects. These data are discussed with reference to transitivity and the relationships among the data set predicted from the absolute scaling hypothesis. [Work supported by NIH.]
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