Table 2.

Performances (mean (SD) Min–Max) in time-based prospective memory tasks. Times are generally in milliseconds and accuracy in percentage of correct answers. ‘Average time between two space bar presses’ is a measure of performance in time-based ‘PM trials’, and is given in seconds (ideal time between two presses: 30 s). Significant differences between patients and controls appear in bold font (performance accuracy in time-based PM trials refers to average delay between two space bar presses). RT: reaction times; PM: prospective memory; OGonly: performance in ongoing task trials in the phase where they performed alone (before a prospective memory instruction has been given); OGPM: performance in ongoing task trials in the phase where they are mixed with PM task; PM trials: only performance in prospective memory trials is considered.

	All patients n = 45	Controls n = 107	Patients vs. controls (Mann–Whitney tests)
Time-based PM pictures
Accuracy in ‘OGonly’	89.2 (9.3) 65–100	92.0 (5.4) 80–100	U = 2038; z = −1.04; p = 0.300
RT in ‘OGonly’	1306 (339) 809–2267	1067 (197) 590–1640	U = 1334;z = −3.96;p < 0.001
Accuracy in ‘OGPM’	85.6 (7.8) 62.1–96.0	87.6 (3.7) 74.4–94.8	U = 2125; z = −0.65; p = 0.518
RT in ‘OGPM’	1163 (286) 803–2072	987 (167) 605–1351	U = 1580;z = −2.93;p = 0.003
Average time between two space bar presses	34.207 (9.796) 16.979–52.582	32.935 (9.579) 10.655–72.386	U = 1400; z = −0.36; p = 0.718
Time-based PM words
Accuracy in ‘OGonly’	98.0 (4.0) 80–100	98.9 (2.7) 80–100	U = 2035; z = −1.32; p = 0.188
RT in ‘OGonly’	817 (320) 522–2102	635 (130) 385–973	U = 1390;z = −3.66;p < 0.001
Accuracy in ‘OGPM’	89.9 (8.5) 50.8–98.8	91.8 (3.5) 79.4–97.2	U = 2009; z = −1.05; p = 0.293
RT in ‘OGPM’	930 (280.6) 596–1983	774 (158) 450–1278	U = 1452;z = −3.40;p = 0.001
Average time between two space bar presses	33.625 (11.108) 11.394–70.175	30.147 (6.384) 11.336–56.837	U = 1156; z = −1.39; p = 0.164