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recruited for this experiment: teachers and students from the University of
Gävle. Altogether 18 subjects participated (12 males and six females),
with their age ranging between 18 and 65 years, and a median of 44 years.
The data collected initially was task response times in seconds, and
correctness of the response per stimulus. Accuracy was then calculated as
the percentage of correct answers per subject and block of stimuli.
The visual task performed was a combinational task that involved
evaluation of the differences of bar heights and the assessment of their
distances on the map. The task was performed in both 2D (mono) and 3D
(stereoscopic) with head-tracking.
Questionnaire
In addition to the primary data (time and accuracy), other factors that
might influence the visual task were gathered with a questionnaire given to
the participants at the end of the test. This questionnaire was intended to
collect information regarding familiarity with 3D displays (yes/no),
perceived visual discomfort (yes/no), strongest confidence in answers
(2D/3D), and whether the subject was a frequent player of 3D video-
games (yes/no). Participants were also asked to make a self-assessment of
their 3D vision capabilities (high/low).
Results from Experiment II
The primary data consisted of 18 (subjects) x 25 (stimuli per trial) x 2
(visualization conditions) time and error (correct/incorrect) responses.
Individual stimuli responses were aggregated by averaging the first block
of 13 observations and the second block of 12 observations for each trial.
Those resulting 18 (subjects) x 2 (blocks) x 2 (visualizations) averaged
time and accuracy observations were subsequently analysed using the
statistical package R [21].
Accuracy is the proportion of correct responses to the total responses
per subject and block.
Times and accuracy for visualizations
Inspection of the histograms of accuracies in 2D and 3D suggested that
data were normally distributed in both cases. This was also verified with a
Shapiro-Wilk test.
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