A lack of self control during adolescence is not uniquely human

Cell Press

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Impulsiveness in adolescence isn’t just a phase, it’s biology. And despite all the social factors that define our teen years, the human brain and the brains of other primates go through very similar changes, particularly in the areas that affect self-control. Two researchers review the adolescent brain across species on August 20 in the journal Trends in Neurosciences.

“As is widely known, adolescence is a time of heightened impulsivity and sensation seeking, leading to questionable choices. However, this behavioral tendency is based on an adaptive neurobiological process that is crucial for molding the brain based on gaining new experiences,” says Beatriz Luna of the University of Pittsburgh, who co-authored the review with Christos Constantinidis of Wake Forest School of Medicine.

Structural, functional, and neurophysiological comparisons between us and macaque monkeys show that this difficulty in stopping reactive responses is similar in our primate counterparts—who during puberty, also show limitations in tests where they have to stop a reactive response. “The monkey is really the most powerful animal model that comes closest to the human condition,” says Constantinidis. “They have a developed prefrontal cortex and follow a similar trajectory with the same patterns of maturation between adolescence and adulthood.”

Taking risks and having thrilling adventures during this period isn’t necessarily a bad thing. “You don’t have this perfect inhibitory control system in adolescence, but that’s happening for a reason. It has survived evolution because it’s actually allowing for new experiences to provide information about the environment that is critical form optimal specialization of the brain to occur,” Luna says. “Understanding the neural mechanisms that underlie this transitional period in our primate counterparts is critical to informing us about this period of brain and cognitive maturation.”

Human neurological development during this time is characterized by changes in structural anatomy—there is an active pruning of redundant and un-used neural connections and a strengthening of white matter tracts throughout the brain that will determine the template for how the adult brain will operate. Specifically, by adolescence all foundational aspects of brain organization are in place and during this time they undergo refinements that will enable the most optimal way to operate to deal with the demands of their specific environment.

In particular, the development of neural activity patterns that allow for the preparation of a response seems to be a key element of this phase of development—and essential to successful performance on self-control tasks.

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