Table 4. Tests of effect size variation from study to study within young and older adult subgroups.

Process	Outcome	Young adults			Older adults
		Q	df	p	Q	df	p
Attentional deployment	Subjective	0.36	1	0.55	3.38	1	0.07
Cognitive change	Subjective	41.64	11	<0.001	43.43	11	<0.001
	Behavioral	25.58	7	<0.001	36.33	7	<0.001
	Physiological	32.55	5	<0.001	12.34	5	0.03
Response modulation	Subjective	62.06	16	<0.001	29.07	16	0.02
	Behavioral	43.45	14	<0.001	27.96	14	0.01
	Physiological	22.70	14	0.07	17.29	14	0.24