Table 1.

Conjunction analysis of numerosity (discrete stimuli) vs. extent (analogue stimuli) and parametric analyses of numerosity vs. extent as the difficulty of the estimation increased revealed clusters of activation along bilateral IPS

	Brain region	Coordinates x, y, z	Z score	Cluster size (voxels)
Estimating numerosity:
In space and in time	cIPS right	33, −78, 24	5.64	102
		24, −90, 21	5.44
		33, −78, 15	4.01
	cIPS left	−21, −90, 27	4.64	39
	IPS left	−24, −48, 48	3.73	12
		−33, −51, 54	3.22
	IPS right	33, −57, 51	4.00	6
Difficulty effect while estimating numerosity:
In space	Left IPS/Pocs	−57, −39, 45	3.97	10
	Right IPS/Pocs	27, −42, 48
In time	IPS right	21, −51, 42	3.42	6
		24, −42, 42	3.30

P < 0.001. cIPS, caudal IPS; Pocs, postcentral sulcus.