LECTURE 3 - DEVELOPING BRAIN 🧠

Synaptogenesis: The rapid formation of synaptic connections early in life. This supports early learning and adaptation.
Synaptic Pruning: The process by which unused neural connections are eliminated to optimize brain efficiency. Active connections are strengthened, facilitating learning and memory.
Interaction of Genes and Experience: Genes provide the framework for brain development, but environmental experiences fine-tune and shape these processes.
Sensitive Periods: Critical phases during development where the brain is particularly receptive to specific experiences (e.g., sensory and cognitive skills).

Prolonged Maturation: Advances in imaging, like fMRI, have shown that brain development continues well into adolescence and early adulthood.
Grey and White Matter Changes:
- Grey matter (cell bodies and synapses) peaks in late childhood and declines due to synaptic pruning.
- White matter (myelinated axons) increases during adolescence, enhancing connectivity and efficiency.
Social Brain: Changes in the medial prefrontal cortex impact social cognition and decision-making. Adolescents may process social information differently from adults.
Risk-Taking Behaviors: Adolescents are more prone to risk-taking due to peer influences and ongoing brain maturation.

Adverse Experiences: Neglect or trauma during sensitive periods can result in structural and functional brain abnormalities. For example, institutionalized children show reduced stress response and cognitive challenges.
Toxic Stress: Prolonged stress without supportive relationships can undermine brain development, impacting regions like the amygdala and hippocampus.

Learning Opportunities: Adolescence remains a window for cognitive development, highlighting the importance of educational and social interventions.
Criminal Justice: Understanding brain plasticity and delayed maturity can inform policies regarding adolescent culpability and rehabilitation.

Childhood Onset: ADHD and Autism Spectrum Disorders (ASD) begin early and highlight atypical brain development.
Adolescent Onset: Disorders like depression and schizophrenia often emerge in adolescence, possibly linked to changes in brain regions like the amygdala.

Leverage sensitive periods to optimize learning and social development.
Prioritize interventions for at-risk children, such as those in foster care or exposed to chronic stress.
Recognize that adolescence is a period of immense neuroplasticity, making it crucial for targeted educational and mental health strategies.