The consistency of psychophysical scales obtained by different measurment procedures is an important topic for research. Two experiments tested whether the scale obtained by the rating and bisection methods were consistent. 40 university students bisected intervals on the brightness continuum and, subsequently, rated the brightness determined by such bisections, or they first rated brightnesses and then bisected brightness intervals. Analysis shows the scales obtained by these methods were mutually consistent when a large number of response categories (the integers from 0 to 100) were used for ratings. When a small number of response categories (the integers from 0 to 6) were used, the methods were consistent only when ratings were produced after the bisections. This suggests that bisections may have increased the consistency of the rating scale by generating an internal representation of equally spaced sensory magnitudes subsequently used for ratings.
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