The method of constant stimuli with three rating categories and the use of Rasch models

作者：Burro Roberto^*; Sartori Riccardo; Vidotto Giulio

来源：Quality and Quantity, 2011, 45(1): 43-58.

DOI：10.1007/s11135-009-9282-3

• Rasch models
• Psychophysics
• The method of constant stimuli
• Rating categories
• Fundamental measurement
• Method of transitions

Logistic Models support an alternative general solution to compute the point of subjective equality (Vidotto et al., I modelli simple logistic e rating scale nella determinazione del punto di eguaglianza soggettivo: una nuova prospettiva per il metodo degli stimoli costanti, 1996) when the Method of Constant Stimuli is used (Bock and Jones, The Measurement and Prediction of Judgment and Choice, 1968). The Extended Logistic Models (Andrich, Appl. Psychol. Meas. II:581-594, 1978) offer the theoretical frame to compute individual and general thresholds when the method of constant stimuli is applied using a forced choice with more than two alternatives. As an example of the advantages of the application of this procedure, we show a data-set derived from an experiment on rhythm perception (Maestrini, La percezione del cambiamento nei ritmi uditivi, 2003), where two groups of experimental and na < ve subjects were asked to judge whether the listened rhythm was constant, accelerated or decelerated. We have computed individual and general thresholds differentiating constancy from both acceleration and deceleration for all the different experimental conditions. The main advantage of this solution, compared to traditional psychophysical techniques, is not only related to better estimates of the individual point of subjective equality. The improvement can be summarized in the available fit tests to verify the agreement between the model both for stimuli and subjects.

• 出版日期2011-1