Brain chemistry: an introduction to neurons, neurotransmitters and hormones

“Brain chemistry” is a useful starting phrase, but it can suggest a simpler picture than biology supports.

Neurons, neurotransmitters and hormones are part of communication across the brain and body.

They do not work as separate dials that translate one feeling into one chemical reading.

How a neuron passes a message

Neurons are specialized cells that communicate through electrical activity and chemical signals.

At a synapse, the small junction between cells, one neuron can release a neurotransmitter.

The molecule crosses the gap and binds to receptors on a receiving cell.

What follows depends on the receiving cell, the receptor and the signals arriving at the same time.

The National Institute of General Medical Sciences describes this sequence and notes that neurotransmitters can also affect cells beyond neurons (NIGMS, “What Is a Neurotransmitter?”).

This is why a familiar label such as “dopamine is motivation” leaves out too much.

Dopamine participates in several processes, including movement and learning; its role depends on circuits and context.

A period of low motivation does not tell us that a person has too little dopamine, just as a productive day does not reveal a particular neurotransmitter level.

The name of a molecule describes one part of a system, not a personal explanation.

Neurotransmitters and hormones are related signals

Hormones are chemical messengers released by glands into the bloodstream.

They reach tissues that have the receptors able to respond to them.

Hormone signals can influence processes across the body, and feedback loops help regulate their release.

Levels can also vary over time and across life stages.

These basic features are summarized by the NIH’s National Institute of General Medical Sciences (NIGMS, “What Is a Hormone?”).

The categories are helpful, but they are not a complete map of a person’s experience.

The brain and endocrine system communicate; a signal’s effect depends on where and when it acts, on other systems, and on the situation.

Mood, attention and behavior emerge from interacting biological and environmental processes.

They cannot be reverse-engineered from a single word such as “stress,” “focus” or “pleasure.”

What an everyday example can and cannot tell you

Imagine, hypothetically, that someone finds it hard to concentrate during a demanding week.

They can describe observable details: which tasks are unfinished, when it is easiest to begin, what interruptions occur and what changed in the schedule.

Those observations may help them choose a practical next step, such as breaking one task into smaller actions or setting aside a quieter work period.

They do not identify a neurotransmitter or hormone.

A coaching conversation can help someone define a non-clinical goal, plan an action and review whether that action was useful.

It cannot measure brain chemistry through discussion, a questionnaire or a routine-tracking sheet.

Nor does a coaching plan establish a biological cause or promise a change in hormone levels.

A careful way to use the science

When you encounter a claim about a “chemical imbalance,” ask what exactly was measured, in which tissue, under what conditions and for what purpose.

A result from a laboratory study does not automatically become a test for an individual, and a description of a biological pathway does not by itself establish a coaching technique.

This overview is meant to explain a few basic terms, not to interpret symptoms or laboratory results.

Questions about health, medication or test results belong with a qualified health professional.

A laboratory value also needs a context: which substance was measured, in which sample, and at what time?

It is a reading of that measurement under those conditions, not a map of all communication between brain cells.

Without the measure and the question it answers, a broad phrase such as “brain chemistry” cannot explain an individual experience.

For information about coaching goals and the activities included in a service, ask for information.