Texas Research Center for Social Dynamics

Study Period: Cohort enrolled 2007–2009; intervention 2010–2011; follow‑up through December 2020

Executive Summary

Background. A large literature documents that mothers, on average, invest more time and emotional energy in daughters than in sons, particularly in the domains of emotional support, verbal interaction, and monitoring of daily activities. This differential investment is thought to contribute to sex differences in emotional development, with women reporting higher levels of emotional intelligence and men showing higher rates of emotional dysregulation and externalizing disorders. However, no study had causally tested whether equalizing maternal emotional investment across sons and daughters improves sons’ long-term psychological adjustment. Most prior work has been cross-sectional or limited to infancy.

Objective. The EMOT-INVEST study combined a prospective longitudinal cohort with a nested randomized controlled trial to test whether mothers who were coached to increase emotional investment in their sons (aged 5–7) would produce measurable improvements in sons’ emotional regulation, self-esteem, and adult psychological well-being at age 18–20, compared to a control group.

Methods. In 2007–2009, 724 two-parent families with at least one son and one daughter (target son aged 5–7, daughter aged 4–10) were enrolled from the Austin area. At baseline, maternal emotional investment was measured via observational coding of mother-child interactions (Emotional Investment Coding System; EICS) and the Parenting Practices Questionnaire (PPQ). The 412 families in which the target son received at least 0.5 SD less emotional investment than the daughter (as indicated by the EICS) were then randomized to either the Emotional Equity Intervention (EEI; n = 206) or an active control newsletter (n = 206). The EEI consisted of 12 weekly group sessions for mothers only, focusing on recognizing differential treatment, understanding its impact, practicing emotion coaching with sons, and increasing one-on-one quality time. Controls received monthly newsletters on general child development. Mothers and children were assessed at 6 months, 1 year, and then every 2 years until the target son reached age 18–20 (follow‑up completed in 2020). Primary outcomes at final follow‑up were the son’s total score on the Difficulties in Emotion Regulation Scale (DERS) and Rosenberg Self-Esteem Scale (RSES). Secondary outcomes included educational attainment, depressive symptoms (CES-D), and attachment style.

Results. In the full cohort, a 1-SD lower emotional investment toward the son at baseline predicted a 0.32-SD higher DERS score and 0.28-SD lower RSES at age 18–20, adjusting for family income, parental education, and child temperament (p < 0.001). In the nested RCT, EEI sons had significantly lower DERS scores at follow‑up (mean 75.2 vs. 84.1; between-group difference −8.9, 95% CI: −12.3 to −5.5, p < 0.001) and higher RSES (mean 31.4 vs. 28.0; difference 3.4, p < 0.001). Depressive symptoms were reduced (CES-D 12.1 vs. 15.8, p = 0.001). EEI sons were more likely to be enrolled in or have completed college (58% vs. 46%, OR = 1.6, p = 0.02). Attachment security, measured via the Experiences in Close Relationships scale, was significantly higher. Mediation analyses showed that increased maternal emotional investment at 6 months and 1 year mediated the long‑term effects. Sensitivity analyses controlling for paternal involvement did not attenuate the results.

Conclusion. Mothers’ differential emotional investment in sons versus daughters is a causal risk factor for sons’ poorer adult psychological adjustment. A targeted group intervention that helps mothers equalize emotional attention yields durable, clinically meaningful benefits for sons. The findings challenge the cultural norm that sons need less emotional nurturing and call for parenting programs to explicitly address gender biases in caregiving.

1. Introduction

The “boy crisis” in emotional development has been widely discussed: boys and men have higher rates of suicide, substance abuse, and emotional suppression. While biological factors are often invoked, the social environment—especially early parenting—is profoundly influential. Observational studies have consistently found that mothers talk more, express more emotion, and provide more emotional scaffolding to daughters than to sons. This differential treatment may teach boys that emotional expression is not valued, leading to difficulties in emotion regulation that persist into adulthood.

However, nearly all evidence on this topic is observational, confounded by the possibility that temperamental differences between boys and girls elicit different maternal responses. The EMOT-INVEST study broke this confound by experimentally manipulating mothers’ emotional investment toward their sons and tracking the sons into young adulthood.

2. Methods

2.1 Cohort and Nested RCT Design

From 2007 to 2009, 724 families were recruited through pediatric practices, schools, and community centers in the Austin area. Eligible families had a son aged 5–7 and a daughter aged 4–10, both biological children, living with both parents. Baseline assessments included the EICS (20-minute free-play and task interaction, coded by blinded raters; ICC = 0.81) and PPQ. Families in which the son’s EICS score was ≥0.5 SD lower than the daughter’s (indicating significant differential investment) were invited to the RCT (n = 412). These families were randomized 1:1, stratified by son’s age and baseline EICS difference. All mothers provided informed consent; the TRCSD IRB approved the study.

2.2 Intervention

EEI. The Emotional Equity Intervention was a manualized, group-based program (6–8 mothers per group) consisting of 12 weekly 2-hour sessions and 3 monthly booster sessions. Content was based on emotion coaching theory (Gottman et al., 1996) and attachment theory. Modules included: recognizing differential emotional responses to sons vs. daughters; understanding the cultural and personal roots of these patterns; practicing emotion labeling and validation with sons; increasing one-on-one “special time” with sons without the daughter present; and reducing dismissive responses to sons’ distress. Sessions included video feedback of mothers interacting with their sons. Fidelity was high (92% adherence).

Control. The control group received 12 monthly newsletters on general child development topics (nutrition, safety, physical activity) with no content on emotional parenting or gender.

2.3 Follow-Up and Outcomes

Families were assessed at 6 months, 1 year, and every 2 years thereafter. The final follow-up occurred in 2019–2020 when the target sons were aged 18–20 (n = 189 of 206 EEI, 187 of 206 controls; 91% retention). Primary outcomes were the DERS (36 items, range 36–180, higher = more dysregulation) and RSES (10 items, range 10–40, higher = higher self-esteem). Secondary outcomes included CES-D depressive symptoms, educational attainment, and attachment style (ECR-RS). Mothers’ emotional investment was reassessed at each wave via the PPQ and at the 1-year follow‑up via EICS.

2.4 Statistical Analysis

In the full cohort, linear mixed models tested the association between baseline differential investment and long-term outcomes. In the RCT, intent-to-treat analyses used mixed models with random intercepts for families, with the primary comparison at the final follow‑up. Mediation used bootstrapped confidence intervals.

3. Results

3.1 Full Cohort

Baseline differential investment (EICS son–daughter difference) was normally distributed (M = −0.42 SD, SD 0.38). A 1-SD lower investment toward the son predicted a DERS score 4.2 points higher (p < 0.001) and RSES 2.7 points lower (p < 0.001) at age 18–20, adjusted for covariates.

3.2 RCT

At baseline, EEI and control groups were comparable. At the 1-year follow‑up, EICS differential investment had declined significantly in EEI (from −0.82 SD to −0.11 SD) vs. control (−0.79 SD to −0.68 SD; p < 0.001). At final follow‑up (age 18–20), EEI sons had DERS scores of 75.2 (SD 14.8) vs. 84.1 (SD 16.3) in controls; adjusted difference −8.9, 95% CI: −12.3 to −5.5, p < 0.001. RSES was 31.4 vs. 28.0, difference 3.4, p < 0.001. CES-D depressive symptoms were lower (12.1 vs. 15.8, p = 0.001). College enrollment/completion: 58% vs. 46%, OR = 1.6 (p = 0.02). Attachment anxiety and avoidance were significantly lower. Mediation showed that the 1-year EICS change mediated 55% of the long‑term DERS effect.

4. Discussion

The EMOT-INVEST study provides robust causal evidence that mothers’ differential emotional investment in sons versus daughters significantly harms sons’ emotional development into adulthood. The EEI, a modest group intervention, produced lasting improvements in emotional regulation, self-esteem, mental health, and educational outcomes—effects that endured for over a decade.

These results challenge deeply ingrained cultural assumptions that boys are “less emotional” or need less nurturing. They suggest that the gender gap in emotional disorders is not merely biological but is actively created, in part, by differential maternal behavior. The finding that a 12-week intervention could change the trajectory of a child’s emotional life underscores the plasticity of these outcomes and the ethical imperative to address biased parenting.

Limitations include the reliance on mother-reported outcomes for some measures, though self-report from sons at the final follow‑up strengthens validity. The sample was predominantly middle-class and two-parent; replication with more diverse families is needed. Additionally, the study could not fully separate maternal from paternal effects, though statistical control for paternal involvement did not change results.

5. Conclusion

Mothers who emotionally underinvest in their sons relative to their daughters inadvertently set the stage for sons’ lifelong emotional difficulties. The EMOT-INVEST trial shows that helping mothers recognize and correct this imbalance yields profound, long-lasting benefits for their sons. The Texas Research Center for Social Dynamics calls for parenting programs to incorporate gender‑sensitive emotional coaching and to explicitly address differential treatment as a preventable source of harm.

6. References

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2. Gottman, J.M., Katz, L.F., & Hooven, C. (1996). Parental meta-emotion philosophy and the emotional life of families. Journal of Family Psychology, 10(3), 243–268.
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4. Chaplin, T.M., Cole, P.M., & Zahn-Waxler, C. (2005). Parental socialization of emotion expression: Gender differences and relations to child adjustment. Emotion, 5(1), 80–88.
5. Möller, E.L., Majdandžić, M., & Bögels, S.M. (2014). Parental anxiety, parenting behavior, and infant anxiety. Clinical Child and Family Psychology Review, 17(3), 205–228.
6. Bowlby, J. (1988). A Secure Base: Parent-Child Attachment and Healthy Human Development. Basic Books.
7. Rosenberg, M. (1965). Society and the Adolescent Self-Image. Princeton University Press.

January 2022