We've all seen it. A student sits in front of a lesson they've engaged with before, and nothing is sticking. They seem checked out, irritable, maybe even combative. Before we label that as laziness or attitude, we need to ask a different question: what is actually happening in their brain right now?
Stress is not just a feeling. It's a biological event.
When a student is stressed, their brain releases the hormone cortisol — the body's primary stress hormone. Oftentimes, a bit of stress can help to motivate and sharpen performance, but what happens if the stress becomes more intense and chronic? Research shows that prolonged stress leads to measurable shrinkage of the hippocampus, the brain region most responsible for consolidating and storing long-term memories, as well as the amygdala, the brain's threat-detection center (Fandakova & Hartley, 2020).
These measurable decreases in size have a profound effect on the adolescent brain. Their brains are still actively building the systems designed to regulate emotion and stress (Xie et al., 2021). Couple this with the hormones of puberty and the pressures from the external environment, and they are, in a very real sense, trying to climb a neurological mountain.
Emotion → Attention → Learning
There's a sequence worth understanding here: emotion → attention → learning.
Whatever emotional state a student arrives in sets the tone and pace for the learning possible that day. The limbic system, which includes the amygdala and hippocampus, is directly connected to the frontal lobes, which are responsible for reasoning, planning, and higher-order thinking. When a perceived threat activates the amygdala, it can effectively "hijack" all cognitive resources away from the frontal lobes, essentially shutting the door on reasoning and complex thought. Researchers call this process "downshifting," and its effects on a lesson are similar to throwing a baseball full of kryptonite at Superman at the bottom of the 9th — game over.
The lesson here is that what looks like disengagement might actually be a student whose brain is physically unable to access the type of thinking we're asking of them right now due to feelings of stress and anxiety.
The Good News? This Is Where Teachers Have Real Power.
The emotional climate of a classroom is among the most significant variables affecting student learning outcomes (Maryati et al., 2020). Research consistently points to the following as effective ways to help reduce anxiety and increase engagement in the classroom:
- Predictability and safety reduce amygdala activation. When students know what to expect and feel secure, their brains are free to do the work of learning.
- Connection to caring adults is neurologically protective, and not just in the emotional sense. The way we talk to students about their performance matters more than many of us realize.
- Exercise, sleep, and mindfulness are among the most evidence-backed strategies for managing cortisol and supporting brain health. Promote movement whenever possible in the classroom, encourage healthy sleep habits, and give the students time to pause and reflect on the lesson.
The bottom line: We cannot separate academic instruction from emotional well-being. When we invest in creating safe, connected, emotionally responsive classrooms, we are not sacrificing rigor. We are creating the neurological conditions that make rigor possible in the first place.