Eric Lacourse | Université de Montréal (original) (raw)

Papers by Eric Lacourse

Research paper thumbnail of Handling Planned and Unplanned Missing Data in a Longitudinal Study

The quantitative methods for psychology, Feb 1, 2023

Research paper thumbnail of Initial risk factors, self-compassion trajectories, and well-being outcomes during the COVID-19 pandemic: A person-centered approach

Frontiers in Psychology, Feb 8, 2023

Research paper thumbnail of COVID-19, economic threat and identity status: Stability and change in prejudice against Chinese people within the Canadian population

Frontiers in Psychology, Oct 28, 2022

Research paper thumbnail of Blinded by trust in close others: Examining the effect of social closeness on cooperative behaviors during the COVID‐19 pandemic

Social and Personality Psychology Compass, Jul 25, 2023

Research paper thumbnail of Gender Differences in Adolescents’ Exposure to Stressful Life Events and Differential Links to Impaired School Functioning

Journal of Abnormal Child Psychology, Jan 19, 2019

Research paper thumbnail of Effects of a Mindfulness-Based Intervention on the Perception of Basic Psychological Need Satisfaction among Special Education Students

International Journal of Disability Development and Education, Jul 13, 2017

Research paper thumbnail of Understanding information about COVID-19: how sources’ reliability and level of understanding influenced adherence to sanitary measures in Canada

Research Square (Research Square), Oct 11, 2022

Research paper thumbnail of How level of understanding and type of used sources relate to adherence to COVID-19 public health measures in Canada

Scientific Reports

Previous studies have highlighted the importance of promoting health literacy and minimizing misi... more Previous studies have highlighted the importance of promoting health literacy and minimizing misinformation to encourage higher adherence to key public health measures during the COVID-19 pandemic. This study explores how one’s self-reported understanding of information and types of sources used to get information regarding COVID-19 can hinder adherence to public health measures implemented by the Canadian government. Data was collected following a longitudinal design of 11 time points for April 2020 to April 2021. The sub-sample used for this study included 2659 Canadians who completed the survey for at least four time points. Using Latent Class Growth Analysis, we modelled typical trajectories of adherence to three key public health measures: staying home, social distancing and mask wearing. Overall, a lower level of understanding was associated with lower adherence trajectories to public health measures, and vice-versa. Adjusted odds ratio (AOR) showed that the higher the level o...

Research paper thumbnail of StepMix: A Python Package for Pseudo-Likelihood Estimation of Generalized Mixture Models with External Variables

arXiv (Cornell University), Apr 7, 2023

Research paper thumbnail of Initial risk factors, self-compassion trajectories, and well-being outcomes during the COVID-19 pandemic: A person-centered approach

Frontiers in Psychology

IntroductionWe investigated whether initial risk classes and heterogeneous trajectories of self-c... more IntroductionWe investigated whether initial risk classes and heterogeneous trajectories of self-compassion over the course of the pandemic may impact well-being outcomes 1 year into the pandemic.MethodsA large, representative sample of Canadians (N = 3,613; 50.6% women) was sampled longitudinally over 11 waves (April 2020–April 2021), using a rolling cross-sectional survey design. Analyses were conducted in three steps: (1) latent class analysis to identify heterogeneity in risk factors (sociodemographic, cognitive-personality, health-related) early in the pandemic, (2) latent class growth analysis (LCGA) to identify longitudinal self-compassion trajectories, and (3) GLM to examine effects of risk factor classes and self-compassion trajectories, as well as their interaction, on later well-being (mental health, perceived control, life satisfaction).Results and DiscussionFour risk factor classes emerged, with 50.9% of participants experiencing low risk, 14.3% experiencing multiple ris...

Research paper thumbnail of Perception of social inclusion/exclusion and response inhibition in adolescents with past suicide attempt: a multimodal task-based fMRI study

The occurrence of suicidal behaviors increases during adolescence. Hypersensitivity to negative s... more The occurrence of suicidal behaviors increases during adolescence. Hypersensitivity to negative social signals and deficits in cognitive control are putative mechanisms of suicidal behaviors, which necessitate confirmation in youths. Multidomain functional neuroimaging could enhance the identification of patients at suicidal risk beyond standard clinical measures. Three groups of adolescents (N = 96; 78% females, age = 11.6–18.1) were included: patients with depressive disorders and previous suicide attempts (SA, n = 29); patient controls with depressive disorders but without suicide attempt (PC, n = 35); and healthy controls (HC, n = 32). We scanned participants with 3T-MRI during social inclusion/exclusion (Cyberball Game) and response inhibition (Go-NoGo) tasks. Neural activation was indexed by the blood-oxygenation-level dependent (BOLD) of the hemodynamic response during three conditions in the Cyberball Game (“Control condition”, “Social Inclusion”, and “Social Exclusion”), an...

Research paper thumbnail of Understanding information about COVID-19: how sources’ reliability and level of understanding influenced adherence to sanitary measures in Canada

Previous studies have highlighted the importance of promoting health literacy and minimizing misi... more Previous studies have highlighted the importance of promoting health literacy and minimizing misinformation to encourage higher adherence to key sanitary measures during the COVID-19 pandemic. This study explores how one’s understanding of information and sources’ reliability can hinder adherence to sanitary measures implemented by the Canadian government. Data was collected from a representative sample of 3,617 Canadians, following a longitudinal design of 11 measurement times from April 2020 to April 2021. Overall, a low level of understanding was associated with membership in lower adherence trajectories to sanitary measures. Adjusted odds ratio (AOR) showed it was between 3 and 34 times more likely for participants with low understanding to be in the lowest adherence trajectory. Information sources’ reliability also showed a significant effect on adherence trajectories for social distancing and staying home (AOR: between 1.5 and 2.5). These results are discussed considering futu...

Research paper thumbnail of Corrigendum: A Mindfulness-Based Intervention for Students With Psychiatric Disorders in a Special Education Curriculum: A Series of n-of-1 Trials on Internalized and Externalized Symptoms

Frontiers in Education, 2018

Research paper thumbnail of Developmental trajectories of overt conduct problems and ADHD from ages 2 to 10

Research paper thumbnail of Introduction à l’analyse de séquence et illustration de son application en sciences sociales à partir de patrons de transitions de l’école au travail

Revue de psychoéducation, 2022

Research paper thumbnail of Heterogeneity in the course of suicidal ideation and its relation to suicide attempts in first-episode psychosis: a five-year prospective study

Research Square (Research Square), Sep 13, 2022

Research paper thumbnail of Heterogeneity in the Course of Suicidal Ideation and its Relation to Suicide Attempts in First-Episode Psychosis: A 5-Year Prospective Study

The Canadian Journal of Psychiatry, Apr 18, 2023

Objectives Although the risk of suicide is high in first-episode psychosis (FEP), little is known... more Objectives Although the risk of suicide is high in first-episode psychosis (FEP), little is known about the course of suicidal ideation and its relation to suicide attempts. Therefore, we aimed to identify 5-year trajectories of suicidal ideation and associated factors in FEP and compare how suicide attempts were distributed across these identified trajectories. Method This 5-year prospective study assessed suicidal ideation, suicide attempts and potentially associated factors through research interviews, chart review and coroners’ reports in 382 FEP patients [mean age = 23.53 ( SD = 3.61)] admitted to 2 5-year early psychosis services in Montreal, Canada. Trajectories were identified using a semiparametric mixture model, and associated factors with multinomial logistic regression. Results Three suicidal ideation trajectories were identified: low and decreasing ( n = 325, 85.08%); early decline, then increasing ( n = 30, 7.85%), and persistent suicidal ideation ( n = 27, 7.07%). Suicidal ideation prior to admission (OR = 2.85, 95% CI, 1.23 to 6.63, P < 0.05) and cocaine use disorder (OR = 6.78, 95% CI, 1.08 to 42.75, P < 0.05) were associated with the early decline, then increasing suicidal ideation trajectory. Persons with prior suicide ideation (OR = 4.33, 95% CI, 1.66 to 11.29, P < 0.05) and attempts (OR = 8.18, 95% CI, 2.39 to 27.97, P < 0.001) and alcohol use disorder (OR = 3.63, 95% CI, 1.4 to 9.42, P < 0.05) were more likely to belong to the persistent suicidal ideation trajectory, and to attempt suicide during follow-up. Conclusions Our study highlights heterogeneity in the course of suicidal ideation over 5 years and the importance of ongoing assessment of suicidal risk in FEP patients, particularly for patients who persistently report suicidal ideation, as they are likelier to engage in suicide attempts. Patients with factors associated with increasing or persistent suicidal ideation trajectories should be targeted for suicide prevention interventions from the early phase of follow-up. Given the small number of persons in these trajectories and the wide CIs for some factors, larger studies are however needed to further characterize who belongs in each group.

Research paper thumbnail of Regard clinique sur l’étude des symptômes dépressifs et des pensées suicidaires chez des adolescents canadiens

Perspectives psychiatriques, Apr 1, 2020

Research paper thumbnail of Parental Control and Conflicts in Adolescence: A Cross-National Comparison of the United States, Canada, Mexico, France, and Italy

Journal of Family Issues, 2018

This study investigated parental behavioral control, disciplinary style, and parent–youth conflic... more This study investigated parental behavioral control, disciplinary style, and parent–youth conflicts in five countries: The United States, Canada, Mexico, France, and Italy. A self-report questionnaire was applied to 1,751 adolescents and their parents. Results indicate that, after controlling for possible confounding variables, parenting in the United States and Canada was characterized by reduced requirements and rules and a disciplinary style marked by induction and negotiation. A higher level of control, and a disciplinary approach more punitive and coercive characterized parents in Mexico and France. Mexican adolescents reported the highest levels of conflict, while the United States stands out with the lowest rate of conflict. Generally, Italy was at a middle position. Regression analyses indicated that harsh parental disciplinary measures are associated with conflicts in all countries. Results are discussed in light of the ethnocultural perspectives developed in cross-cultural...

Research paper thumbnail of Algorithmes D’Apprentissage et Modèles Statistiques

Méthodes qualitatives, quantitatives et mixtes, 2e édition, 2020

Research paper thumbnail of Handling Planned and Unplanned Missing Data in a Longitudinal Study

The quantitative methods for psychology, Feb 1, 2023

Research paper thumbnail of Initial risk factors, self-compassion trajectories, and well-being outcomes during the COVID-19 pandemic: A person-centered approach

Frontiers in Psychology, Feb 8, 2023

Research paper thumbnail of COVID-19, economic threat and identity status: Stability and change in prejudice against Chinese people within the Canadian population

Frontiers in Psychology, Oct 28, 2022

Research paper thumbnail of Blinded by trust in close others: Examining the effect of social closeness on cooperative behaviors during the COVID‐19 pandemic

Social and Personality Psychology Compass, Jul 25, 2023

Research paper thumbnail of Gender Differences in Adolescents’ Exposure to Stressful Life Events and Differential Links to Impaired School Functioning

Journal of Abnormal Child Psychology, Jan 19, 2019

Research paper thumbnail of Effects of a Mindfulness-Based Intervention on the Perception of Basic Psychological Need Satisfaction among Special Education Students

International Journal of Disability Development and Education, Jul 13, 2017

Research paper thumbnail of Understanding information about COVID-19: how sources’ reliability and level of understanding influenced adherence to sanitary measures in Canada

Research Square (Research Square), Oct 11, 2022

Research paper thumbnail of How level of understanding and type of used sources relate to adherence to COVID-19 public health measures in Canada

Scientific Reports

Previous studies have highlighted the importance of promoting health literacy and minimizing misi... more Previous studies have highlighted the importance of promoting health literacy and minimizing misinformation to encourage higher adherence to key public health measures during the COVID-19 pandemic. This study explores how one’s self-reported understanding of information and types of sources used to get information regarding COVID-19 can hinder adherence to public health measures implemented by the Canadian government. Data was collected following a longitudinal design of 11 time points for April 2020 to April 2021. The sub-sample used for this study included 2659 Canadians who completed the survey for at least four time points. Using Latent Class Growth Analysis, we modelled typical trajectories of adherence to three key public health measures: staying home, social distancing and mask wearing. Overall, a lower level of understanding was associated with lower adherence trajectories to public health measures, and vice-versa. Adjusted odds ratio (AOR) showed that the higher the level o...

Research paper thumbnail of StepMix: A Python Package for Pseudo-Likelihood Estimation of Generalized Mixture Models with External Variables

arXiv (Cornell University), Apr 7, 2023

Research paper thumbnail of Initial risk factors, self-compassion trajectories, and well-being outcomes during the COVID-19 pandemic: A person-centered approach

Frontiers in Psychology

IntroductionWe investigated whether initial risk classes and heterogeneous trajectories of self-c... more IntroductionWe investigated whether initial risk classes and heterogeneous trajectories of self-compassion over the course of the pandemic may impact well-being outcomes 1 year into the pandemic.MethodsA large, representative sample of Canadians (N = 3,613; 50.6% women) was sampled longitudinally over 11 waves (April 2020–April 2021), using a rolling cross-sectional survey design. Analyses were conducted in three steps: (1) latent class analysis to identify heterogeneity in risk factors (sociodemographic, cognitive-personality, health-related) early in the pandemic, (2) latent class growth analysis (LCGA) to identify longitudinal self-compassion trajectories, and (3) GLM to examine effects of risk factor classes and self-compassion trajectories, as well as their interaction, on later well-being (mental health, perceived control, life satisfaction).Results and DiscussionFour risk factor classes emerged, with 50.9% of participants experiencing low risk, 14.3% experiencing multiple ris...

Research paper thumbnail of Perception of social inclusion/exclusion and response inhibition in adolescents with past suicide attempt: a multimodal task-based fMRI study

The occurrence of suicidal behaviors increases during adolescence. Hypersensitivity to negative s... more The occurrence of suicidal behaviors increases during adolescence. Hypersensitivity to negative social signals and deficits in cognitive control are putative mechanisms of suicidal behaviors, which necessitate confirmation in youths. Multidomain functional neuroimaging could enhance the identification of patients at suicidal risk beyond standard clinical measures. Three groups of adolescents (N = 96; 78% females, age = 11.6–18.1) were included: patients with depressive disorders and previous suicide attempts (SA, n = 29); patient controls with depressive disorders but without suicide attempt (PC, n = 35); and healthy controls (HC, n = 32). We scanned participants with 3T-MRI during social inclusion/exclusion (Cyberball Game) and response inhibition (Go-NoGo) tasks. Neural activation was indexed by the blood-oxygenation-level dependent (BOLD) of the hemodynamic response during three conditions in the Cyberball Game (“Control condition”, “Social Inclusion”, and “Social Exclusion”), an...

Research paper thumbnail of Understanding information about COVID-19: how sources’ reliability and level of understanding influenced adherence to sanitary measures in Canada

Previous studies have highlighted the importance of promoting health literacy and minimizing misi... more Previous studies have highlighted the importance of promoting health literacy and minimizing misinformation to encourage higher adherence to key sanitary measures during the COVID-19 pandemic. This study explores how one’s understanding of information and sources’ reliability can hinder adherence to sanitary measures implemented by the Canadian government. Data was collected from a representative sample of 3,617 Canadians, following a longitudinal design of 11 measurement times from April 2020 to April 2021. Overall, a low level of understanding was associated with membership in lower adherence trajectories to sanitary measures. Adjusted odds ratio (AOR) showed it was between 3 and 34 times more likely for participants with low understanding to be in the lowest adherence trajectory. Information sources’ reliability also showed a significant effect on adherence trajectories for social distancing and staying home (AOR: between 1.5 and 2.5). These results are discussed considering futu...

Research paper thumbnail of Corrigendum: A Mindfulness-Based Intervention for Students With Psychiatric Disorders in a Special Education Curriculum: A Series of n-of-1 Trials on Internalized and Externalized Symptoms

Frontiers in Education, 2018

Research paper thumbnail of Developmental trajectories of overt conduct problems and ADHD from ages 2 to 10

Research paper thumbnail of Introduction à l’analyse de séquence et illustration de son application en sciences sociales à partir de patrons de transitions de l’école au travail

Revue de psychoéducation, 2022

Research paper thumbnail of Heterogeneity in the course of suicidal ideation and its relation to suicide attempts in first-episode psychosis: a five-year prospective study

Research Square (Research Square), Sep 13, 2022

Research paper thumbnail of Heterogeneity in the Course of Suicidal Ideation and its Relation to Suicide Attempts in First-Episode Psychosis: A 5-Year Prospective Study

The Canadian Journal of Psychiatry, Apr 18, 2023

Objectives Although the risk of suicide is high in first-episode psychosis (FEP), little is known... more Objectives Although the risk of suicide is high in first-episode psychosis (FEP), little is known about the course of suicidal ideation and its relation to suicide attempts. Therefore, we aimed to identify 5-year trajectories of suicidal ideation and associated factors in FEP and compare how suicide attempts were distributed across these identified trajectories. Method This 5-year prospective study assessed suicidal ideation, suicide attempts and potentially associated factors through research interviews, chart review and coroners’ reports in 382 FEP patients [mean age = 23.53 ( SD = 3.61)] admitted to 2 5-year early psychosis services in Montreal, Canada. Trajectories were identified using a semiparametric mixture model, and associated factors with multinomial logistic regression. Results Three suicidal ideation trajectories were identified: low and decreasing ( n = 325, 85.08%); early decline, then increasing ( n = 30, 7.85%), and persistent suicidal ideation ( n = 27, 7.07%). Suicidal ideation prior to admission (OR = 2.85, 95% CI, 1.23 to 6.63, P < 0.05) and cocaine use disorder (OR = 6.78, 95% CI, 1.08 to 42.75, P < 0.05) were associated with the early decline, then increasing suicidal ideation trajectory. Persons with prior suicide ideation (OR = 4.33, 95% CI, 1.66 to 11.29, P < 0.05) and attempts (OR = 8.18, 95% CI, 2.39 to 27.97, P < 0.001) and alcohol use disorder (OR = 3.63, 95% CI, 1.4 to 9.42, P < 0.05) were more likely to belong to the persistent suicidal ideation trajectory, and to attempt suicide during follow-up. Conclusions Our study highlights heterogeneity in the course of suicidal ideation over 5 years and the importance of ongoing assessment of suicidal risk in FEP patients, particularly for patients who persistently report suicidal ideation, as they are likelier to engage in suicide attempts. Patients with factors associated with increasing or persistent suicidal ideation trajectories should be targeted for suicide prevention interventions from the early phase of follow-up. Given the small number of persons in these trajectories and the wide CIs for some factors, larger studies are however needed to further characterize who belongs in each group.

Research paper thumbnail of Regard clinique sur l’étude des symptômes dépressifs et des pensées suicidaires chez des adolescents canadiens

Perspectives psychiatriques, Apr 1, 2020

Research paper thumbnail of Parental Control and Conflicts in Adolescence: A Cross-National Comparison of the United States, Canada, Mexico, France, and Italy

Journal of Family Issues, 2018

This study investigated parental behavioral control, disciplinary style, and parent–youth conflic... more This study investigated parental behavioral control, disciplinary style, and parent–youth conflicts in five countries: The United States, Canada, Mexico, France, and Italy. A self-report questionnaire was applied to 1,751 adolescents and their parents. Results indicate that, after controlling for possible confounding variables, parenting in the United States and Canada was characterized by reduced requirements and rules and a disciplinary style marked by induction and negotiation. A higher level of control, and a disciplinary approach more punitive and coercive characterized parents in Mexico and France. Mexican adolescents reported the highest levels of conflict, while the United States stands out with the lowest rate of conflict. Generally, Italy was at a middle position. Regression analyses indicated that harsh parental disciplinary measures are associated with conflicts in all countries. Results are discussed in light of the ethnocultural perspectives developed in cross-cultural...

Research paper thumbnail of Algorithmes D’Apprentissage et Modèles Statistiques

Méthodes qualitatives, quantitatives et mixtes, 2e édition, 2020