. 2013 May 3;4:244. doi: 10.3389/fpsyg.2013.00244

Table 1.

Mean proportion signal change (BOLD, ΔCBF/ΔCMRO₂, ΔCBF, ΔCMRO₂) within visual cortex and motor cortex, from baseline (fixation and non-motor response periods, respectively).

Cortical area, task	BOLD^*		ΔCBF/ΔCMRO₂^*		ΔCBF		ΔCMRO₂^*
	Older	Younger	Older	Younger	Older	Younger	Older	Younger
Visual cortex, response to flashing annuli (SEM)	0.0059 (0.0008)	0.0073 (0.0007)	1.8844 (0.0639)	2.3977 (0.2360)	0.3621 (0.0542)	0.3267 (0.0302)	0.1969 (0.0336)	0.1327 (0.0194)

	BOLD		ΔCBF/ΔCMRO₂		ΔCBF^*		ΔCMRO₂^*
	Older	Younger	Older	Younger	Older	Younger	Older	Younger

Motor cortex, response to flashing annuli (SEM)	0.0016 (0.0001)	0.0022 (0.0003)	1.6275 (0.0166)	1.6639 (0.0276)	0.8788 (0.1231)	0.5624 (0.0721)	0.5354 (0.0691)	0.3361 (0.0393)

*Difference between groups, p < 0.05.