Alterations in the inferior longitudinal fasciculus in autism and associations with visual processing: a diffusion-weighted MRI study

Table 4 Between-group differences for the visual processing measures

	ASD (n = 17)		TD (n = 17)		Group test statistic	p value	Cohen’s d
	M	SD	M	SD	Group test statistic	p value	Cohen’s d
Fragmented Objects Outline Task (ms) ^a	4335	1252	4031	919	F = 0.91	.35	0.31
Coherent Motion Task (% coherence)	29	12	24	11	F = 2.02	.17	0.48
Visual search task (ms) ^b	2075	505	1825	295	F = 2.93	.09	0.52
Low similarity ^c	1792	421	1677	295	t = 0.72	.47	0.25
High similarity ^c	2360	634	1973	381	t = 2.51	.017	0.72
ROCF fragmentation score	5.4	2.1	4.2	2.8	F = 1.76	.19	0.46

Note. Since the groups were compared on four tasks, a Bonferroni correction results in a significance level (α) of 0.0125
^aOther effects retained in the model for Fragmented Objects Outline Task: within-subject factors type (F(1,1279) = 13.07, p < .001) and homogeneity (F(1,1279) = 54, p = < .001)
^bOther effects retained in the model for visual search: within-subject factors target-distractor similarity (F(1,1285) = 86.07, p < .001), number of distractors (F(1,1285) = 57.67, p < .001), and the interaction between group and target-distractor similarity (F(1,1285) = 7.68, p = .006)
^cTukey-Kramer correction was performed for group contrasts for the specific levels of a within-subject factor

ISSN: 2040-2392