Table 1.

Recognition performance (d prime, means and standard errors) on the immediate and delayed tests

Levels of processing	Retention intervals
	Immediate	Delay 1	Delay 2	Delay 3
Experiment 1
Deep (Sentence)	2.61 ± 0.07	1.69 ± 0.10	1.59 ± 0.11	1.01 ± 0.11
Shallow (Rhyme)	2.10 ± 0.06	1.21 ± 0.10	1.32 ± 0.09	0.61 ± 0.10
Experiment 2
Deep (Sentence)	2.58 ± 0.07	1.67 ± 0.17	1.34 ± 0.11	0.93 ± 0.10
Shallow (Structure)	1.83 ± 0.09	1.02 ± 0.16	0.84 ± 0.11	0.59 ± 0.12
Experiment 3
Deep (Sentence)	2.83 ± 0.08	1.63 ± 0.11	1.56 ± 0.13	1.43 ± 0.12
Shallow (Rhyme)	2.11 ± 0.06	1.22 ± 0.15	0.96 ± 0.12	0.66 ± 0.08