Abstract
The multi-stimulus test with hidden reference and anchors (MUSHRA) is
commonly used for subjective quality assessment of audio systems. Despite
its wide acceptance in scientific and industrial sectors, the method is
not free from bias. One possible source of bias in the MUSHRA method may
be attributed to a graphical design of its user interface. This paper
examines the hypothesis that replacement of the standard multi-slider
layout with a single-slider version could reduce a stimulus spacing bias
observed in the MUSHRA test. Contrary to the expectation, the
aforementioned modification did not reduce the bias. This outcome formally
supports the validity of using multiple sliders in the MUSHRA graphical
interface.
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