Puberty as a Predictor of Changes in the Dual Systems Imbalance Gap: The Moderating Role of Autism Spectrum Disorder

Technical Summary: Puberty as a Predictor of Changes in the Dual Systems Imbalance Gap: The Moderating Role of Autism Spectrum Disorder

Problem Statement
The Dual Systems Model posits that adolescent risk-taking behavior stems from a developmental imbalance between the socioemotional system (driving sensation-seeking) and the cognitive control system (governing impulse control). While puberty is widely recognized as the trigger for the rapid maturation of the socioemotional system, creating a temporary gap where sensation-seeking outpaces impulse control, significant variation exists in how this imbalance manifests across individuals. Specifically, there is limited understanding of how the timing of puberty influences these cognitive shifts in neurodivergent populations, particularly those with Autism Spectrum Disorder (ASD). Prior literature suggests that individuals with ASD may exhibit different trajectories in impulse control and sensation-seeking compared to neurotypical peers, yet the interaction between pubertal onset, ASD status, and the resulting dual systems imbalance remains understudied. Furthermore, existing research often aggregates male and female youth, potentially obscuring sex-specific developmental patterns.

Methodology
This study utilized a longitudinal dataset from the Adolescent Brain Cognitive Development (ABCD) study, analyzing data from the first three waves (N ≈ 11,880 youth aged 8–10 at baseline). The analysis focused on establishing temporal ordering between independent and dependent variables.

• Dependent Variable: Dual Systems Imbalance at Wave 3. This was constructed as a composite score using the UPPS Impulsive Behavior Scale. Sensation-seeking (measured by the sensation-seeking subscale) and impulse control (measured by the lack of premeditation subscale) were standardized. The final imbalance score was calculated by adding the standardized sensation-seeking score to the reverse-coded standardized impulse control score. Higher positive scores indicate greater imbalance (high sensation-seeking, low impulse control), while negative scores indicate the inverse.
• Independent Variables:
  • Pubertal Development: Measured at Wave 2 using a binary variable indicating progression from prepubertal (Tanner Stage 1) to the onset of puberty (Tanner Stage 2 or higher).
  • Autism Spectrum Disorder (ASD): Measured at baseline (Wave 1) as a binary variable based on parent-reported diagnosis.
• Moderator: The interaction between Pubertal Development and ASD status.
• Control Variables: Race/ethnicity, Latinx ethnicity, familial income, age at Wave 3, lifetime exposure to violence (Wave 2), community socioeconomic disadvantage (Area Deprivation Index), and baseline dual systems imbalance (Wave 1).
• Analytic Strategy: Separate Ordinary Least Squares (OLS) regression models were estimated for male and female youth. Model 1 tested direct effects, and Model 2 added the interaction term. Multiple imputation (20 imputations) was used to handle missing data, which was determined to be not missing completely at random.

Key Results
The study revealed significant sex-specific differences in how puberty and ASD influence dual systems imbalance:

• Female Youth: No significant direct effects of pubertal status or ASD diagnosis were observed on dual systems imbalance at Wave 3. The interaction between puberty and ASD was also non-significant. Significant predictors for females included age, exposure to violence, and baseline imbalance scores.
• Male Youth:
  • Direct Effects: Entering puberty (Wave 2) significantly predicted greater dual systems imbalance at Wave 3 (Coefficient = .102, p < .019). Conversely, an ASD diagnosis was associated with significantly lower (more negative) dual systems imbalance scores (Coefficient = -.270 in Model 1; effect attenuated in Model 2).
  • Interaction Effect: A significant negative interaction was found between puberty and ASD (Coefficient = -.510, p < .029).
  • Marginal Effects: Visualization of the interaction showed divergent trajectories. For male youth without ASD, entering puberty was associated with an increase in dual systems imbalance scores (higher sensation-seeking relative to impulse control). In contrast, for male youth with ASD, entering puberty was associated with a dramatic decrease in imbalance scores, resulting in negative mean scores characterized by higher impulse control and lower sensation-seeking compared to their pre-pubertal state.

Key Contributions
This paper contributes to the literature by:

1. Identifying Sex-Specific Mechanisms: Demonstrating that the "dual systems gap" widens following puberty specifically for male youth, but not female youth, suggesting that the universal application of the model may overlook critical biological or social sex differences.
2. Elucidating the Role of ASD: Providing empirical evidence that ASD moderates the relationship between puberty and dual systems imbalance in males. Contrary to the expectation that neurodivergence might exacerbate risk, the study found that post-pubertal males with ASD exhibited a reduction in the sensation-seeking/impulse-control gap, characterized by lower sensation-seeking scores.
3. Refining Developmental Trajectories: Highlighting that the neurobiological changes triggered by puberty (specifically dopaminergic development) may manifest differently in ASD populations, potentially leading to sensory overload that dampens the drive for novel experiences rather than amplifying it.

Significance and Claims
The paper claims that these findings highlight the necessity of examining developmental processes separately for male and female youth and for neurodivergent subgroups. The authors posit that the attenuated dual systems imbalance gap observed in post-pubertal males with ASD may serve as a protective factor against involvement in risky or antisocial behaviors, as these youth demonstrate lower drives for sensation-seeking and higher impulse control relative to their neurotypical peers.

However, the authors maintain a modest tone regarding the broader implications. They caution that while the reduced imbalance gap may lower antisocial risk, it does not necessarily equate to optimal social development; the dampened drive for novelty could potentially inhibit social exploration and relationship formation. The study explicitly notes limitations, including the binary nature of the ASD measure (which may miss symptom severity and underdiagnose females), the reliance on parent-reported diagnoses, and the lack of gender identity variables in the dataset. Consequently, the authors conclude that while the findings offer unique insight into the interplay of puberty, ASD, and cognitive development, further research is required to understand the full scope of these differential trajectories and their long-term social consequences.