UCLA expert tells Alaska senators adolescent brain plasticity creates window for rehabilitation

Adriana Galvin, co‑executive director of the UCLA Center for the Developing Adolescent, told a joint meeting of the Alaska Senate Judiciary and Education Committees on March 14 that adolescence is a period of heightened brain plasticity that creates a “window of opportunity” for rehabilitation and learning, and cautioned that confinement and other adverse experiences can interrupt that development.

Galvin, a neuroscientist and dean of undergraduate students at UCLA, summarized decades of developmental neuroscience and cited research showing that adolescence typically begins with puberty (around ages 10–12) and continues into the early to mid‑20s. “Plasticity equals possibility,” she told the committee, arguing that the same biological features that make adolescents more prone to risk taking also make them more responsive to interventions.

The presentation outlined three linked features of adolescent brain development: rapid refinement of neural connections, a second wave of plasticity that makes neurons highly responsive to experience, and heightened activity in reward‑related brain regions such as the striatum. Galvin said neurons “can gain and lose about 25% of their connections weekly” during puberty, falling to roughly 10% in adulthood — a change she framed as why experience matters more at younger ages than later in life.

Why it matters: committee members pressed Galvin to connect the science to policy choices now before legislatures nationwide — from juvenile confinement practices and reentry supports to school start times and whether 16‑ and 17‑year‑olds should be allowed to consent to some mental‑health services.

On confinement and juvenile justice, Galvin said traditional detention can limit the developmental needs adolescents require — opportunities to explore, to build decision‑making skills, to form values and to receive continued support from caring adults. She cited research by a colleague at UC Irvine that tied sentencing and facility climate to later reoffending, reporting a first‑year recidivism rate of about 5.2% among youth who were not subject to harsher sentencing in that analysis. Galvin told senators that positive experiences in custody — including education, skills training and a constructive climate — were associated with lower rearrest rates in that work.

Senators asked specific questions about policy implications. On school hours, Galvin said evidence from districts that changed high‑school start times — notably Seattle — shows later start times are associated with fewer teen driver crashes and modest gains in academic measures; she said studies indicate later start times often result in longer total sleep rather than simply shifting bedtimes later. On access to mental‑health care, Galvin answered a direct question about whether 16‑ and 17‑year‑olds should be able to consent to some mental‑health treatment without parental permission: “I absolutely think that they should be,” she said, adding that earlier treatment tends to predict better outcomes in her longitudinal work on childhood anxiety.

Galvin stressed that experience accumulates: adverse exposures earlier in life can compound during adolescence, and many adults report childhood adversity. She told the committee that in one adult survey about 90% reported earlier adverse experiences and roughly one‑third reported five or more such experiences; she used those numbers to underline that many adolescents entering systems for justice or treatment have prior adversity that increases the need for supportive interventions.

Committee members sought operational guidance about what legislative changes to consider. Galvin pointed to reentry supports and continuity with community, family and non‑incarcerated peers as critical, and she urged attention to facility climate and program content for youth who do spend time in secure care. She cited evidence that youth who perceive their confinement more positively — whether because of programs, education, or climate — are less likely to be rearrested.

The presentation closed with Galvin reiterating that adolescent plasticity makes early intervention more effective: “the earlier it happens, the better the outcomes,” she said. There were no committee actions or votes recorded on March 14; the meeting consisted of the presentation and a follow‑up question-and-answer period.

Ending: The joint committees adjourned after the presentation. The Senate Judiciary Committee noted it will not meet on March 17 and plans to reconvene March 19 at 1:30 p.m.