Mood computational mechanisms underlying increased risk behavior in adolescent suicidal patients
Figures
Task design, outcome and time effects on mood, and group differences in mood.
(A) Gambling task with mood ratings. On each trial, participants were asked to choose between a certain option and a gambling option (self-paced). Once selected, the chosen option was highlighted in yellow for 500 ms. Then the corresponding outcome was displayed in the center of the screen for 1000 ms. The cumulated score was always shown in the right-upper corner. Every two to three trials, participants were asked to complete a self-paced rating of their happiness, answering the question ‘How happy are you at the moment’ on a slider from 0 (very unhappy) to 100 (very happy). (B) Patients and healthy controls felt happier after winning than losing. (C) Mood drifted over time. (D) Group difference in mood before the task shows weakened mood in S+. (E) Group difference in average mood displays lower mood experience in S+. (F) Mood variance was similar for all three groups, as indexed by the standard deviation of happiness ratings across the task. (G) Each group earned about the same amount of points by the end of the task. Abbreviations: HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; *p < 0.05. Error bars correspond to the standard error.
Choice results.
(A) Group differences in gambling behavior. The gray dots represent the winning model prediction. (B) The estimated parameters from the winning choice model differed across groups. S+ exhibited stronger approach motivation than S− and HC. (C) The mediation model among the group, , and gambling behavior in the gain condition. The approach parameter mediated the effects of STB group on increased gambling behavior in the gain condition. Abbreviations: HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; *p < 0.05.
Effect of Suicidal thoughts and behavior on mood dynamics.
(A) Group difference in mood baseline, β0. (B) Group differences in mood sensitivity to certain reward (CR) and gamble reward (GR). (C) Correlational difference in S− and S+ between mood sensitivity to CR and gambling behavior. The lighter, semi-transparent dots represent individual participants, while the dark dot with an error bar indicates the mean of binned scores (for illustration purposes only). Abbreviations: CR, certain reward; GR, gamble reward; HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; *p < 0.05.
Validation of suicidal-related results in an independent dataset of general populations (n = 747).
(A) Group difference in gambling behavior in the gain domain. (B) The estimated parameters from the winning choice model (pseudo R2 = 0.479) differed across groups, with higher approach behavior for S+. (C) The mediation model among the group, , and gambling behavior in the gain condition. The approach parameter mediated the group effect on increased gambling behavior in the gain condition. (D) Group difference in mood before the task shows weakened mood in S+. (E) Group difference in average mood displays lower mood experience in S+. (F, G) The estimated parameters from the CR–GR mood model (mean R2 = 0.588). (F) Group difference in mood baseline, β0. (G) Group differences in mood sensitivity to certain reward (CR) and gamble reward (GR). Abbreviations: S−, general participants without suicidal thoughts and behavior; S+, general participants with suicidal thoughts and behavior; *p < 0.05, +p < 0.1.
Control analysis for age and other anxiolytics in patients, which were significant between groups.
Control analysis for childhood maltreatment and emotion regulation problems in patients, which were significant between groups.
Control analysis for depression/anxiety symptoms in patients, which were significant between groups.
Choice and mood model recovery.
Mood model recovery was performed in a stage-by-stage manner, mirroring the model comparison procedure used in the main analyses because each model comparison step addresses a specific question and doing so prevents dispersion of model evidence across multiple similar models. Specifically, rather than entering all mood models into a single recovery space, recovery was evaluated separately within each comparison space used for model selection. Thus, each confusion matrix reflects recovery among only the models that were directly compared at that stage.
Replication of Rutledge et al., 2017’s findings using BDI.
Depression symptom measured by BDI was negatively correlated with the baseline mood parameter.
RPE model results (M1).
(A) Group differences in mood sensitivity to certain reward (CR), expected value (EV), and reward prediction error (RPE). (B) Correlation between Suicidal Ideation score at current time (BSI-C) and mood sensitivity to CR. Abbreviations: HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; BSI-C, Beck Scale for Suicidal Ideation at the current time; *p < 0.05.
Expectation effect on mood.
(A) Group differences in mood sensitivity to certain reward (CR), gamble reward (GR), and expected value (EV). (B) Correlation between Suicidal Ideation score at current time (BSI-C) and mood sensitivity to CR. Abbreviations: HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; BSI-C, Beck Scale for Suicidal Ideation at the current time; *p < 0.05.
Results from M5.
(A) Group differences in mood sensitivity to certain reward (CR), better gamble reward (GRbetter), and worse gamble reward (GRworse). (B) Correlation between Suicidal Ideation score at current time (BSI-C) and mood sensitivity to CR. Abbreviations: HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; BSI-C, Beck Scale for Suicidal Ideation at the current time; *p < 0.05.
Permutation tests.
We conducted permutation tests (1,000,000 iterations) to evaluate the robustness of our main results, ensuring consistency with the same normal distribution, and sample size. Specifically, in each permutation, we randomly drew five samples from the S+ group and repeated this process 20 times to construct a suicidal group (100 samples). The same procedure was applied to the S− group to construct a control group. We then calculated the t-values between the two constructed groups on variables of interest, including the proportion of gambling choices, the approach parameter, and mood sensitivity to certain rewards (CR). The 1,000,000 t-values formed the H1 distributions of between-group differences. Nonparametric p values were calculated as the proportion of permutations that generated t-values failing to reach significance (parametric p > 0.05), divided by 1,000,000. Across these variables, the S+ group significantly differed from the S− group (ps < 0.038).
Tables
Demographics, clinical, psychological characteristics of patients with and without suicidal thoughts and behaviors.
| Group | Group contrast | S+ vs. S− | |||||
|---|---|---|---|---|---|---|---|
| HC (n = 118) | S− (n = 25) | S+ (n = 58) | F/χ2 | p | t/χ2 | p | |
| Sex (female/male) | 75/43 | 16/9 | 41/17 | 0.912 | 0.634 | 0.363 | 0.547 |
| Age | 15.31 ± 2.15 | 15.68 ± 1.75 | 14.83 ± 1.80 | 1.868 | 0.157 | 1.997 | 0.049 |
| BSI-C | 1.29 ± 3.62 | 2.84 ± 2.66 | 18.02 ± 7.56 | 224.230 | <0.001 | –9.754 | <0.001 |
| BSI-W | 3.58 ± 6.60 | 4.04 ± 3.22 | 27.98 ± 6.02 | 326.242 | <0.001 | –18.723 | <0.001 |
| CTQ | 13.98 ± 11.29 | 22.64 ± 12.34 | 33.00 ± 17.03 | 40.023 | <0.001 | –2.743 | 0.008 |
| ERQ-R | 14.77 ± 4.38 | 13.08 ± 6.34 | 8.48 ± 5.39 | 31.317 | <0.001 | 3.376 | 0.001 |
| ERQ-S | 6.86 ± 3.64 | 8.80 ± 3.77 | 10.79 ± 3.79 | 22.322 | <0.001 | –2.200 | 0.031 |
| Suicidal attempts history (yes) | --- | --- | 29 | --- | --- | --- | --- |
| Illness duration (months) | --- | 31.76 ± 18.80 | 31.38 ± 18.70 | --- | --- | 0.085 | 0.933 |
| Family history (yes) | --- | 2 | 10 | --- | --- | 1.206 | 0.272 |
| Current diagnosis (GAD/MDD/BD) | --- | 24/55/9 | 10/17/6 | --- | --- | 1.790 | 0.409 |
| Medication (yes) | --- | 25 | 57 | --- | --- | 0.436 | 0.509 |
| SSRI | --- | 16 | 39 | --- | --- | 0.082 | 0.775 |
| SNRI | --- | 0 | 2 | --- | --- | 0.883 | 0.347 |
| Trazodone | --- | 6 | 16 | --- | --- | 0.115 | 0.734 |
| Antipsychotics | --- | 14 | 32 | --- | --- | 0.005 | 0.945 |
| BZDs | --- | 20 | 45 | --- | --- | 0.060 | 0.807 |
| Other anxiolytics | --- | 12 | 13 | --- | --- | 5.434 | 0.020 |
| Mood stabilizer | --- | 13 | 18 | --- | --- | 3.282 | 0.070 |
| TAI | 43.49 ± 8.54 | 50.38 ± 12.19 | 65.36 ± 7.62 | 108.863 | <0.001 | –6.276 | <0.001 |
| PSWQ | 44.75 ± 10.94 | 50.67 ± 15.17 | 68.56 ± 9.58 | 80.213 | <0.001 | –5.990 | <0.001 |
| BDI | 9.45 ± 9.43 | 18.62 ± 15.11 | 38.30 ± 9.67 | 129.516 | <0.001 | –6.573 | <0.001 |
| CESD | 32.96 ± 11.09 | 42.86 ± 15.66 | 62.52 ± 9.99 | 118.084 | <0.001 | –6.347 | <0.001 |
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Note: For anxiety/depression-related questionnaires (TAI, PSWQ, BDI, and CESD), due to time limitation, data from eight participants in the S+ group and four participants in the S− group was not collected. Bold values indicate an unexpected statistically significant difference. Abbreviations: HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior; BSI-C, Beck Scale for Suicidal Ideation at the current time; BSI-W, Beck Scale for Suicidal Ideation at the worst time; CTQ, Childhood Trauma Questionnaire; ERQ-R, Emotion Regulation Questionnaire-Reappraisal; ERQ-S, Emotion Regulation Questionnaire-Suppression; AD, anxiety disorders; MDD, major depressive disorders; BD, bipolar disorders; SSRI, Selective Serotonin Reuptake Inhibitor; SNRI, serotonin-norepinephrine reuptake inhibitors; BZDs, Benzodiazepines; TAI, Trait Anxiety Inventory; PSWQ, Penn State Worry Questionnaire; BDI, Beck Depression Inventory; CESD, Center for Epidemiologic Studies Depression Scale.
Choice model comparison.
| Model # | Model specification | # of parameters | Δ BIC | Mean R2 | Δ BIC for each group | ||
|---|---|---|---|---|---|---|---|
| HC | S− | S+ | |||||
| 1 | µ | 1 | 3873.16 | 0.08 | 2272.48 | 370.19 | 1230.49 |
| 2 | λ, α, µ | 3 | 3153.79 | 0.18 | 1822.07 | 263.97 | 1067.75 |
| 3 | λ, α, βgain, βloss, µ | 5 | 0 | 0.37 | 0 | 0 | 0 |
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ΔBIC, Bayesian information criterion relative to the winning model (cM3); HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior.
Mood model comparison.
| Model # | Model specification | # of parameters | Δ BIC | Mean R2 | Δ BIC for each group | ||
|---|---|---|---|---|---|---|---|
| HC | S− | S+ | |||||
| 1 | β0, βCR, βEV, βRPE, γ | 5 | –106.77 | 0.48 | –182.04 | 32.54 | 42.73 |
| 2 | β0, βCR, βEV, βRPE, γCR, γEV, γRPE | 7 | 140.00 | 0.54 | –69.40 | 83.20 | 126.20 |
| 3 | β0, βCR, βGR, γ | 4 | 0 | 0.42 | 0 | 0 | 0 |
| 4 | β0, βCR, βGR, γCR, γGR | 5 | –146.81 | 0.48 | –272.15 | 26.37 | 98.97 |
| 5 | β0, βCR, γ | 3 | 2395.62 | 0.18 | 1379.96 | 264.87 | 749.79 |
| 6 | β0, βGR, γ | 3 | 403.46 | 0.34 | 228.69 | 21.24 | 153.52 |
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ΔBIC, Bayesian information criterion relative to the winning model in S+ group (mM3); HC, healthy control; S−, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior.
Suicidal risk prediction from computational parameters.
| Internal validation (n = 201) | External validation (n = 747) | ||||
|---|---|---|---|---|---|
| Cross-validation | Rho (mean ± SD) | Rho [min, max] | p values | Rho | p value |
| Fivefold | 0.205 ± 0.016 | [0.146, 0.230] | <0.039 | 0.073 | 0.045 |
| Tenfold | 0.207 ± 0.011 | [0.172, 0.226] | <0.014 | 0.073 | 0.045 |
A short summary for risk measurement in STB.
Abbreviations: BIS, Barratt Impulsiveness Scale; IGT, Iowa Gambling Task; CGT, Cambridge Gambling Task; BART, the Balloon analog risk task.
| Study | Measurements | Tools | Analysis level | Hypotheses | Results | Category | Model specification |
|---|---|---|---|---|---|---|---|
| Millner et al., 2020 | Questionnaire | UPPS-P Impulsive Behavior Scale + BIS | Sum (sub)scale scores | Heightened impulsiveness in STB | ns | Self-report | |
| Zakowicz et al., 2021 | Questionnaire | BIS | Sum (sub)scale scores | Heightened impulsiveness in STB | ns | Self-report | |
| Jollant et al., 2005 | Task | IGT | Model-agnostic | More risky behavior in STB | Task performance: STB < control | Risk +Ambiguity + Learning | |
| Bridge et al., 2012 | Task | IGT | Model-agnostic | More risky behavior in STB | Task performance: STB < control | Risk +Ambiguity + Learning | |
| Martino et al., 2011 | Task | IGT | Model-agnostic | More risky behavior in STB | Task performance: STB < control | Risk +Ambiguity + Learning | |
| Chamberlain et al., 2013 | Task | CGT | Model-agnostic | More risky (irrational) behavior in STB | Proportion of rational choices: STB < control | Risk | |
| Ackerman et al., 2015 | Task | CGT | Model-agnostic | More risky behavior in STB | Proportion of bet: STB > control | Risk | |
| Dir et al., 2020 | Task | BART | Model-agnostic | More risky behavior in STB | Task performance: STB < control | Risk +Ambiguity + Learning | |
| Liu et al., 2022 | Task | BART | Model-based | Decision-making bias in STB | Task performance: STB > control Loss aversion: STB > control | Risk +Ambiguity + Learning | Exponential‐Weight Model: loss aversion, risk preference, updating exponent, prior belief of exploding |
| Baek et al., 2017-risk | Task | Gambling (gain + loss) | Model-based | Heightened risk aversion in STB | Risk aversion: STB > control | Risk | Risk discount model: discount parameter |
| Baek et al., 2017-loss | Task | Gambling (mix) | Model-based | Heightened loss aversion in STB | Loss aversion: STB > control | risk | Psychophysics; indifference point |
| Alacreu-Crespo et al., 2020 | Task | IGT | Model-based | More risky behavior in STB | Task performance: STB < control; Loss aversion: STB < control; Learning: STB > control | Risk +Ambiguity + Learning | Prospect valence learning delta model: learning/memory, choice consistency, loss aversion, and feedback sensibility |
| The current study | Task | Gambling (gain + loss + mix) | Model-based | More risky behavior in STB | Gambling behavior: STB > control; Approach parameter: STB > control | Risk | The Approach-Avoidance Prospect Theory Model: risk aversion, loss aversion, approach motivation, avoidance motivation, decision noise |
Contrasts for demographic and psychological characteristics.
| S− vs. HC | S+ vs. HC | |||
|---|---|---|---|---|
| t/χ2 | p | t/χ2 | p | |
| Gender | 0.002 | 0.967 | 0.880 | 0.348 |
| Age | 0.816 | 0.416 | –1.458 | 0.147 |
| BSI-C | 2.030 | 0.044 | 19.889 | <0.001 |
| BSI-W | 0.342 | 0.733 | 23.723 | <0.001 |
| CTQ | 3.426 | <0.001 | 8.822 | <0.001 |
| ERQ-R | –1.609 | 0.110 | –8.278 | <0.001 |
| ERQ-S | 2.409 | 0.017 | 6.650 | <0.001 |
| TAI | 3.174 | 0.002 | 15.653 | <0.001 |
| PSWQ | 2.142 | 0.034 | 13.364 | <0.001 |
| BDI | 3.299 | 0.001 | 17.368 | <0.001 |
| CESD | 3.522 | <0.001 | 16.255 | <0.001 |
Sample size for each diagnosis with and without comorbidity in S+ and S− groups.
| Diagnosis | S+ | S− | Statistics |
|---|---|---|---|
| GAD | 1 | 2 | χ2 = 4.843 p = 0.304 |
| MDD | 25 | 9 | |
| BD | 7 | 6 | |
| MDD and BD | 2 | 0 | |
| MDD and AD | 23 | 8 |
Bivariate correlations between choice parameters and socio-demographic clinical variables.
All p values were above 0.05.
| λ | α | βgain | βloss | μ | ||
|---|---|---|---|---|---|---|
| Demographics | Gender | rho = 0.00, p = 1.000 | rho = 0.15, p = 0.179 | rho = 0.08, p = 0.495 | rho = 0.14, p = 0.197 | rho = –0.00, p = 0.961 |
| Age | rho = 0.13, p = 0.230 | rho = 0.07, p = 0.517 | rho = –0.19, p = 0.079 | rho = –0.03, p = 0.811 | rho = –0.17, p = 0.114 | |
| Social variables | CTQ | rho = 0.01, p = 0.946 | rho = –0.19, p = 0.090 | rho = 0.08, p = 0.495 | rho = 0.04, p = 0.700 | rho = 0.20, p = 0.075 |
| ERQ-E | rho = 0.14, p = 0.215 | rho = –0.11, p = 0.338 | rho = –0.17, p = 0.114 | rho = –0.21, p = 0.059 | rho = –0.03, p = 0.769 | |
| ERQ-S | rho = –0.13, p = 0.230 | rho = –0.04, p = 0.727 | rho = 0.15, p = 0.187 | rho = 0.10, p = 0.346 | rho = 0.17, p = 0.128 | |
| Clinical variables | Illness duration | rho = 0.08, p = 0.480 | rho = –0.04, p = 0.737 | rho = –0.05, p = 0.650 | rho = –0.02, p = 0.849 | rho = –0.10, p = 0.351 |
| Family history | rho = 0.16, p = 0.142 | rho = 0.04, p = 0.706 | rho = 0.05, p = 0.648 | rho = –0.04, p = 0.700 | rho = –0.01, p = 0.908 | |
| MDD | rho = –0.11, p = 0.317 | rho = 0.17, p = 0.123 | rho = 0.02, p = 0.882 | rho = –0.04, p = 0.697 | rho = –0.11, p = 0.324 | |
| GAD | rho = 0.11, p = 0.335 | rho = 0.16, p = 0.162 | rho = 0.02, p = 0.851 | rho = 0.03, p = 0.797 | rho = –0.03, p = 0.755 | |
| BD | rho = 0.17, p = 0.124 | rho = –0.12, p = 0.288 | rho = 0.03, p = 0.801 | rho = 0.04, p = 0.707 | rho = 0.05, p = 0.630 |
Bivariate correlations between mood parameters and socio-demographic clinical variables.
p values lower than 0.05 were highlighted in bold.
| βCR | βGR | γ | βo | ||
|---|---|---|---|---|---|
| Demographics | Gender | rho = 0.15, p = 0.168 | rho = 0.23, p = 0.033 | rho = 0.08, p = 0.465 | rho = –0.17, p = 0.126 |
| Age | rho = 0.07, p = 0.503 | rho = –0.27, p = 0.012 | rho = 0.06, p = 0.615 | rho = 0.28, p = 0.010 | |
| Social variables | CTQ | rho = 0.04, p = 0.739 | rho = 0.07, p = 0.545 | rho = –0.06, p = 0.610 | rho = –0.02, p = 0.866 |
| ERQ-E | rho = 0.09, p = 0.440 | rho = –0.26, p = 0.017 | rho = –0.13, p = 0.255 | rho = 0.46, P < 0.001 | |
| ERQ-S | rho = –0.19, p = 0. 086 | rho = –0.06, p = 0.59 9 | rho = –0.14, p = 0.217 | rho = –0.16, p = 0.142 | |
| Clinical variables | Illness duration | rho = –0.01, p = 0.910 | rho = –0.10, p = 0.366 | rho = –0.03, p = 0.788 | rho = –0.02, p = 0.861 |
| Family history | rho = 0.06, p = 0.590 | rho = –0.01, p = 0.908 | rho = –0.09, p = 0.403 | rho = 0.13, p = 0.231 | |
| MDD | rho = –0.02, p = 0.864 | rho = 0.09, p = 0.396 | rho = –0.07, p = 0.521 | rho = –0.21, p = 0.053 | |
| GAD | rho = –0.06, p = 0.569 | rho = 0.05, p = 0.627 | rho = 0.01, p = 0.912 | rho = –0.08, p = 0.491 | |
| BD | rho = 0.16, p = 0.153 | rho = –0.07, p = 0.542 | rho = –0.02, p = 0.888 | rho = 0.16, p = 0.160 |
Mood model comparison by separating gambling outcomes into better and worse parts.
| Model # | Model specification | # of parameters | Δ BIC | Mean R2 | Δ BIC for each group | ||
|---|---|---|---|---|---|---|---|
| HC | S− | S+ | |||||
| mM3 | β0, βCR, βGR, γ | 4 | 0 | 0.42 | 0 | 0 | 0 |
| mM7 | β0, βCR, βGR_better, βGR_worse, γ | 5 | –331.48 | 0.49 | –355.10 | –6.56 | 30.18 |
| mM8 | β0, βCR, βGR_better, βGR_worse, γCR, γGR_better, γGR_better | 7 | –105.40 | 0.56 | –313.09 | 81.34 | 126.34 |
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ΔBIC, Bayesian information criterion relative to the winning model in S+ group (mM3); HC, healthy control; S-, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior.
Choice model comparison by integrating mood or adding traditional bias.
| Model # | Model specification | # of parameters | Δ BIC | Mean R2 | Δ BIC for each group | ||
|---|---|---|---|---|---|---|---|
| HC | S− | S+ | |||||
| cM3 | λ, α, βgain, βloss, µ | 5 | 0 | 0.37 | 0 | 0 | 0 |
| cmM1 | λ, α, βgain, βloss, µ, βMood | 6 | 5530.23 | 0.39 | 287.20 | 68.76 | 174.27 |
| cmM2 | λ, α, βgain, βloss, µ, βMood-CR, βMood-GR | 7 | 1031.18 | 0.41 | 577.03 | 123.84 | 330.32 |
| cM4 | λ, α, µ, βbias | 4 | 376.75 | 0.32 | 277.65 | 34.31 | 64.79 |
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ΔBIC, Bayesian information criterion relative to the winning model (cM3); HC, healthy control; S-, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior.
Mood model comparison by adding a term for whether participants gambled or not, independent of the gambling value.
| Model # | Model specification | # of parameters | Δ BIC | Mean R2 | Δ BIC for each group | ||
|---|---|---|---|---|---|---|---|
| HC | S- | S+ | |||||
| mM3 | β0, βCR, βGR, γ | 4 | 0 | 0.42 | 0 | 0 | 0 |
| mM9 | β0, βCR, βGR βgamble, γ | 5 | –373.13 | 0.49 | –371.83 | –40.74 | 39.45 |
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ΔBIC, Bayesian information criterion relative to the winning model in S+ group (mM3); HC, healthy control; S-, patients without suicidal thoughts and behavior; S+, patients with suicidal thoughts and behavior.
Bayesian independent sample t-tests of median-split anxiety and depression scores (including TAI, PSWQ, BDI, and CESD) on main results (gambling rate, approach parameter (βgain), and mood sensitivity to certain rewards (βCR)) support that general symptoms of anxiety and depression overall did not influence our main results.
BF₀₁ is a Bayes factor comparing the null model (M₀) to the alternative model (M₁), where M₀ assumes no group difference. BF₀₁ >1 indicates that evidence favors M₀. Generally, Bayes Factors between 1 and 3 were interpreted as anecdotal evidence and between 3 and 10 as moderate evidence.
| BF01 | TAI | PSWQ | BDI | CESD |
|---|---|---|---|---|
| Gambling rate | 4.080 | 2.768 | 2.425 | 0.820 |
| βgain | 3.819 | 3.911 | 2.987 | 1.128 |
| βCR | 3.704 | 3.826 | 1.185 | 3.178 |
Linear regressions of gambling behavior, value-insensitive approach parameter (βgain), and mood sensitivity to certain rewards (βCR) on group as a predictor (1 for S+ group and 0 for S- group) and scores for anxiety and depression as covariates.
| Gambling rate | βgain | βCR | |
|---|---|---|---|
| Group | β = 0.164, t = 2.305, p = 0.024 | β = 0.374, t = 2.257, p = 0.027 | β = –0.105, t = –3.461, p = 0.001 |
| TAI | β = –0.010, t = –1.796, p = 0.077 | β = –0.008, t = –0.649, p = 0.519 | β = 0.005, t = 1.921, p = 0.059 |
| PSWQ | β = –0.001, t = –0.401, p = 0.690 | β = –0.008, t = –0.968, p = 0.337 | β = –0.002, t = –1.282, p = 0.204 |
| BDI | β = 0.002, t = 0.519, p = 0.606 | β = –0.003, t = –0.272, p = 0.787 | β = –0.004, t = –2.302, p = 0.025 |
| CESD | β = 0.006, t = 1.585, p = 0.118 | β = 0.015, t = 1.652, p = 0.103 | β = 0.003, t = 1.942, p = 0.056 |
Linear regressions of gambling behavior, value-insensitive approach parameter (βgain), and mood sensitivity to certain rewards (βCR) on group as a predictor (1 for S+ group and 0 for S- group) and orthogonal components of anxiety and depression as covariates.
| Gambling rate | βgain | βCR | |
|---|---|---|---|
| Group | β = 0.164, t = 2.305, p = 0.024 | β = 0.378, t = 2.257, p = 0.027 | β = –0.105, t = –3.461, p = 0.001 |
| PC1 | β = –0.007, t = –0.425, p = 0.672 | β = –0.010, t = –0.247, p = 0.806 | β = 0.009, t = 1.169, p = 0.247 |
| PC2 | β = –0.073, t = –1.569, p = 0.122 | β = –0.164, t = –1.509, p = 0.136 | β = –0.011, t = –0.532, p = 0.596 |
| PC3 | β = 0.098, t = 1.429, p = 0.158 | β = 0.205, t = 1.283, p = 0.204 | β = 0.037, t = 1.255, p = 0.214 |
| PC4 | β = –0.086, t = –1.133, p = 0.262 | β = 0.010, t = 0.054, p = 0.957 | β = 0.086, t = 2.657, p = 0.010 |