Tetris and Word games lead to fewer intrusive memories when applied several days after analogue trauma

Figures & data

Table 1. Informative hypotheses.^a

H1: {µtetrisB – µtetrisA < µcontrolsB – µcontrolsA}, µwordgamesB – µwordgamesA^b

H2: µtetrisB – µtetrisA = µwordgamesB – µwordgamesA < µcontrolsB – µcontrolsA

H3: µtetrisB – µtetrisA < µwordgamesB – µwordgamesA < µcontrolsB – µcontrolsA

H4: µwordgamesB – µwordgamesA < µtetrisB – µtetrisA < µcontrolsB – µcontrolsA

H5: µtetrisB – µtetrisA = µwordgamesB – µwordgamesA = µcontrolsB – µcontrolsA

H6: {µtetrisB – µtetrisA = µcontrolsB – µcontrolsA}, µwordgamesB – µwordgamesA

^aAll hypotheses reflect the difference between diary B (first day) and diary A (last day), so “<” indicates relatively fewer intrusions.

^bA comma indicates no constraints are posed between the adjacent parameters.

Table 2. Means (SDs) for the different conditions.

Variable	Reactivation+Tetris	Reactivation+Word games	Reactivation-only
Randomization
Age	21.3 (2.8)	22.9 (3.1)	22.4 (5.0)
Gender n female (%)	9 (50%)	12 (67%)	14 (78%)
SCL90	118.5 (22)	126.0 (21.5)	121.1 (24.8)
Attention film	8.4 (1.2)	8.9 (.9)	8.4 (1.2)
Distress pre	1.4 (1.8)	1.4 (1.3)	2.0 (1.7)
Distress post	2.3 (2.4)	2.7 (2.4)	3.6 (2.3)
Compliance A	3.9 (3.1)	1.1 (1.4)	3.1 (2.5)
Intrusions diary A^a	3.3 (3.1)	3.0 (3.0)	3.2 (3.0)
Attention reactivation^b	9.1 (1.0)	9.3 (1.0)	9.2 (1.0)
Compliance B	1.7 (1.8)	2.2 (2.3)	2.3 (2.7)
Intrusions
Intrusion-change^c	.1 (.5)	.0 (.0)	.5 (.9)
Intrusions diary B^ad	1.2 (1.7)	.3 (1.5)	1.1 (1.6)
Explorative
Intrusions during task	1.9 (2.2)	1.9 (2.0)	4.3 (3.2)
Task difficulty	3.1 (2.3)	4.9 (2.1)	3.7 (2.9)
Task pleasantness	8.1 (1.7)	7.6 (1.4)	2.9 (2.1)

^aTotal number of intrusive memories reported in diary A or diary B.

^bAttention to the memory reactivation stills.

^cChange in intrusions from diary A to diary B (diary B/first day minus diary A/last day).

^dThe total number of intrusions in diary B is listed for clarity reasons and was not used as dependent variable for reasons explained in the text.

Table 3. Bayes factors for the comparison of informative hypotheses in pairs regarding intrusion changes after the intervention (diaryB[1] – diaryA[4]).

Hypotheses	Bayes factors
BF16: H1 vs. H6^a	6.05
BF25: H2 vs. H5	13.21
BF34: H3 vs. H4	.62 (1.61)^b

^aFor example, BF15 expresses the support for H1 relative to H5.

^bThe entry within brackets is 1/BF, such that it expresses the support for H4 relative to H3.

Table 4. Bayes factors (BF) for all hypotheses against the unconstrained hypothesis (Hu).

Hypothesis	BFxu
H1	1.91
H2	2.47
H3	1.95
H4	3.16
H5	.19
H6	.31

Figure 1. Intrusive memories of the film from before to after the intervention (diary A day 5 to diary B day 1).

Table 5. Bayes factors (BF) for the exploratory analyses against the unconstrained hypothesis (Hu) for task difficulty and pleasantness.

Hypothesis	Difficulty/Intrusions^a BFxu	Difficulty/Ratings BFxu	Pleasantness/Ratings BFxu
Ha: µtetris < µwordgames^b	.96.	1.94	.42
Hb: µtetris > µwordgames	1.04	.06	1.56
Hc: µtetris = µwordgames	1.72	.32	1.20

^aNumber of intrusions during the task as an indicator of task difficulty

^b< refers to Tetris being less difficult than Word games, (indicated by more intrusions during the task) and lower difficulty ratings.