Figure 1: Dynamic RMSE performance measure in degrees plotted
on the ordinate axis, Mean and Standard Error for 48 participants,
against time in ms from stimulus onset on the abscissa for gravity
(black, G), anti-gravity (dark grey, AG) and control with horizontally
accelerating gravity (light grey and dash/dot lines, CO) conditions. (a)
For the horizontal direction in the slow condition. (b) Vertical
direction, slow condition showing worse performance for AG from onset to
200ms. (c) Horizontal fast condition with catch up saccades around
100-300ms. (d) Vertical fast condition similar to (b) with better
performance for G than AG.
ASD and SPQ traits and links to eye tracking
The Schizotypy Personality Questionnaire (SPQ) produced scores
comparable to previous work with Median = 16 and IQR = 18.5. Participant
scores were almost evenly distributed below 30 (See Figure 2A). The SATQ
produced scores comparable to previous work with Median = 17.5 and IQR =
11.5 and scores were approximately normally distributed (Figure 2B). We
ran a Pearson’s correlation between the SPQ and SATQ and found a strong
relationship with r = 0.735, p = 2.73 x
10-9(Figure 2C). We did not decompose the SPQ and SATQ
sub-clusters, to avoid expansion to the 15 permutations (3 SPQ clusters
x 5 SATQ) and therefore used PCA. Instead, we first looked at the
relationship between the inventories and the vertical RMSE-y at stimulus
onset (0ms), which reflects anticipatory responses. For the four
comparisons using a Pearson correlation, we adjusted alpha for
significance to 0.0125. Under the gravity condition, there was a
near-zero correlation between the SPQ and RMSE-y with r = -0.026,
p = 0.86, and similarly a low correlation between SATQ and RMSE-y at
with r = -0.074, p = 0.62. Under the antigravity condition, there
was a low correlation between the SPQ and the RMSE-y with r =
0.065, p = 0.66, and similarly between SATQ and RMSE-y with r =
0.025, p = 0.86. There was therefore no significant relationship between
the trait measures and the tracking performance in the gravity direction
at onset (Figure 2D, E, G and H). We then analysed the relationship
between the traits and the eight saccade measures, adjusting the alpha
value for the Pearson correlations to 0.00625. Under the gravity
condition, there was a non-significant negative correlation between the
SPQ and the Saccade rate, r = -0.169, p = 0.25, and similarly for
the SATQ and saccade rate, r = -0.153, p = 0.30. Under the
antigravity condition, the correlation was near zero for the SPQ and the
saccade rates, r = -0.047, p = 0.75, and the SATQ and the saccade
rate, r = -0.039, p = 0.79. The traits showed little relation to
the rates (Figure 3A-D). For the saccade amplitudes, under the gravity
condition, there was a non-significant negative correlation between the
SPQ and the amplitudes, r = -0.12, p = 0.40, and the SATQ and
amplitudes, r = -0.12, p = 0.41. For the antigravity condition,
these were again near zero for SPQ and amplitude, r = 0.041, p =
0.78, and SATQ and amplitude, r = -0.017, p = 0.91. Traits showed
little relationship with the amplitudes (Figure 3E-H).