Table 1

 Demographic characteristics of the participants and eye movement measurements

Healthy groupAutism with language delayAutism without language delay
*Significant difference from the healthy group at p<0.05.
NS, not significant.
No. of participants1042818
Age (mean (SD))19.76 (11.48)20.50 (11.73)14.00 (7.86)NS
Verbal IQ (mean (SD))108.04 (12.40)104.57 (13.52)113.56 (14.90)NS
Performance IQ (mean (SD))105.79 (12.34)101.79 (15.18)105.33 (16.55)NS
Full Scale IQ (mean (SD))107.53 (12.96)103.57 (14.61)110.44 (15.69)NS
% male83.7%85.7%100.0%NS
Handedness (% right)90.7%92.0%88.9%NS
Peak velocity in deg/sec (mean (SD))314.8 (43.5)296.9 (43.0)289.2* (41.5)NS when corrected for saccade amplitude
Latency in msec (mean (SD))224 (37)226 (39)228 (27)NS
Peak acceleration in deg/sec2 (mean (SD))19247 (3492)18372 (3155)17813 (3239)NS when corrected for saccade amplitude
Peak deceleration in deg/sec2 (mean (SD))17035 (3995)15711 (3552)14927 (3010)NS when corrected for saccade amplitude
Gain0.947 (0.047)0.927 (0.056)0.917* (0.072)F2,147 = 3.53, p<0.05
Standard deviation of individual subjects’ saccade gain0.090 (0.031)0.118* (0.031)0.108* (0.034)F2,147 = 10.13, p<0.001