Depression Isn’t Simply a Chemical Imbalance: What Neuroscience Says Today
For decades, depression was explained as a shortage of serotonin in the brain. When researchers conducted a systematic review of all the relevant evidence, they reached a different conclusion — and a more complex picture of what depression involves has been taking shape since.
Why Some People Feel Everything: The Neuroscience of Sensory Sensitivity
The brain does not receive sensory information passively. It actively filters and weights every incoming signal — and the architecture of that filtering system varies measurably from person to person. For roughly one in six people, the circuits responsible for sensory gating assign higher priority to signals that most nervous systems quietly suppress.
The Brain That Won’t Shut Off at Night: Why Exhaustion and Sleeplessness Coexist
Physical exhaustion and an active mind at bedtime feel like they should cancel each other out. They often don’t. The neuroscience of what happens in the brain during those hours offers a clearer picture of why.
Anxiety and Depression May Share More Brain Biology Than Their Labels Suggest
When researchers examine the brain biology of anxiety and depression side by side, they keep finding the same regions, the same inflammatory markers, the same treatment predictors. This is not a coincidence — and understanding it changes how we think about both conditions.
Bipolar Disorder and the Brain: Beyond “Highs and Lows”
The two-state description leaves out most of the condition — including the periods between episodes, where a 2026 review reports that difficulties persist.
Depression and the Brain’s Reward System: When Life Stops Feeling Rewarding
The standard summary is that depression blunts the reward system. A meta-analysis of 41 studies covering nearly 1,600 people argues that this is not what the data show.
Why Anxiety Often Shows Up in the Body Before the Mind
Racing heart, tight chest, unsettled stomach — often before any thought that could be called worry. Tracing that sequence leads to a structure called the insula, and to a 2026 meta-analysis with a genuinely awkward result.
The Brain Under Pressure: Why We Don’t Think Clearly During Stress
Under acute pressure the prefrontal cortex goes offline just when you need it most. That is not a design flaw — it is a deliberate trade, and knowing it changes what you do.
When Anxiety Becomes a Habit
Anxiety can outlast every reason for it. That is because avoidance is reinforced by relief, and a nervous system that practices vigilance becomes efficient at it.
Could Inflammation Be Affecting Your Brain?
Low-grade inflammation was found in 27% of people with depression. Here is what the evidence supports about inflammation, brain fog and mood — and what it does not.