We consider the possible advantages of visualization in supporting musical interpretation. Specifically, we investigate
the use of visualizations in making a subjective judgement of a student's performance compared to
reference "expert" performance for particular aspects of musical performance-articulation and dynamics. Our
assessment criteria for the effectiveness of the feedback are based on the consistency of judgements made by
the participants using each modality, that is to say, in determining how well the student musician matches the
reference musician, the time taken to evaluate each pair of samples, and subjective opinion of perceived utility
of the feedback.
For articulation, differences in the mean scores assigned by the participants to the reference versus the student
performance were not statistically significant for each modality. This suggests that while the visualization
strategy did not offer any advantage over presentation of the samples by audio playback alone, visualization
nevertheless provided sufficient information to make similar ratings. For dynamics, four of our six participants
categorized the visualizations as helpful. The means of their ratings for the visualization-only and both-together
conditions were not statistically different but were statistically different from the audio-only treatment, indicating
a dominance of the visualizations when presented together with audio. Moreover, the ratings of dynamics under
the visualization-only condition were significantly more consistent than the other conditions.
We conducted a comparative study of different stereoscopic display modalities (head-mounted display, polarized
projection, and multiview lenticular display) to evaluate their efficacy in supporting manipulation and understanding
of 3D content, specifically, in the context of neurosurgical visualization. Our study was intended to
quantify the differences in resulting task performance between these choices of display technology. The experimental
configuration involved a segmented brain vasculature and a simulated tumor. Subjects were asked to
manipulate the vasculature and a pen-like virtual probe in order to define a vessel-free path from cortical surface
to the targeted tumor. Because of the anatomical complexity, defining such a path can be a challenging task.
To evaluate the system, we quantified performance differences under three different stereoscopic viewing conditions.
Our results indicate that, on average, participants achieved best performance using polarized projection,
and worst with the multiview lenticular display. These quantitative measurements were further reinforced by
the subjects' responses to our post-test questionnaire regarding personal preferences.