Table A1.

Main results: Frequentist analysis. Original MNI coordinates for GM volume findings from Kanai et al., 2010, Kanai et al., 2011 are reported in column 1, rows 1–6. Rows 7–8 reports replication tests based on the van Loon et al. (2013) study. Column 2 reports the condition: The ROI condition uses spherical ROI with a radius of 15 mm centred on the original peak. The exact condition uses the exact original peak coordinate. The Mask condition uses a mask consisting of all significant voxels in Kanai et al. (2010). The large and small conditions use large and small voxels for GABA MRS, both centred on the calcarine sulcus. p values are based on one-sided hypothesis tests. For spherical and Mask ROI analyses, p values are corrected using the family-wise error rate.

Original	Condition	Replication coordinate	Noriginal	Nreplication	roriginal	rreplication	pcorrected
−21 −63 61	Exact	−21 −63 61	52	37	−.65	.0130	.530
−21 −63 61	Sphere	−25 −58 48	52	37	−.65	−.220	.585
34 −66 34	Exact	34 −66 34	52	37	−.60	−.0875	.303
34 −66 34	Sphere	40 −70 45	52	37	−.60	−.196	.520
42 −48 40	Exact	42 −48 40	52	37	.37	.3856	.0092
42 −48 40	Sphere	34 −57 37	52	37	.37	.4644	.073
Multiple	Mask	21 −58 66	52	37	N/A	.4845	.091
Occ GABA	Large		14	34	.636	−.0203	.54
Occ GABA	Small		14	15	.636	.2304	.20