How the brain brings together emotions, the body and decisions

A message says, “Let’s talk tomorrow.” Someone rereads those words and starts preparing a defence. They do not yet know the subject, but a previous argument has come to mind, their shoulders have tightened, and they have imagined a disapproving tone. After a restful night, the same phrase might have seemed an ordinary suggestion about timing.

Explaining this as a battle between a “reptilian brain” and a rational cortex is easy. Looking at what happened is more demanding: how the message became linked to a memory, an expectation and a bodily state. That account is less dramatic but leaves room for investigation. The person could clarify the subject, postpone a sharp reply, or notice that they have not had enough sleep.

This is an educational article about the brain and everyday self-observation. Personal sensations cannot establish the activity of a particular brain region; the examples are not diagnostic tools.

The popular “three brains” account assigned instincts to reptiles, emotions to mammals and reason to humans. Brain evolution, however, did not involve constructing three successive storeys. Related structures changed along different evolutionary branches. Joseph Cesario, David Johnson and Heather Eisthen explain the problem in their examination of this model.

For everyday understanding, we can let go of the image of a tiny reptile that an inner human must tame. Calling a sharp response by a supposed brain part’s name does not explain its cause. The circumstances, previous experience, available options and the person’s present state still need consideration.

Structures differ in their organisation, connections and contributions to tasks. The brainstem is involved in vital functions including breathing. The cerebellum contributes to coordination and balance. The cerebral cortex participates in information processing, perception and complex behaviour. These are parts of a single nervous system, rather than three personalities with separate intentions.

The names of the lobes help us navigate anatomy. Frontal regions contribute to planning and organising actions; parietal regions to processing bodily and spatial information; temporal regions to auditory processing and, alongside other structures, memory and understanding speech; occipital regions to visual processing. The NIMH educational introduction offers a brief guide to major areas.

These are broad reference points. Listening to a friend involves recognising sounds and words, remembering the person, attending to their expression and preparing a response. Calling one lobe “responsible for conversation” would leave out much of what happens.

During an important conversation, we remember facts and consider what we might lose or gain. The significance of the event affects which details catch our attention. New information can also change the feeling: a short explanation from the other person sometimes reshapes the situation.

Luiz Pessoa’s network model of the emotional brain considers interactions among systems connecting cortical and subcortical structures. It treats perception, motivation, emotion and action as interrelated processes. Dividing them into separate “emotional” and “rational” teams makes the account too narrow.

Consider choosing a job. Pay, the commute, interest in the work and experience with a previous manager carry different weights. Anxiety may draw attention to a risk; enthusiasm to an opportunity. Feelings can be considered alongside the facts. The choice becomes clearer when we identify what matters, what remains unknown and which terms can be clarified.

Return to “Let’s talk tomorrow.” The observable event is brief: a message proposing a conversation arrived. The interpretation is much longer: the sender is unhappy, the work was poor, a defence will be necessary. The bodily tension is real, although the explanation remains unconfirmed.

If that phrase previously preceded criticism, the memory makes an anxious reading understandable. Yet the present occasion may have another cause. A useful question is: what does the message tell us, and what has past experience added? Asking “What would you like to discuss so I can prepare?” may provide more information than a prolonged internal argument.

This is our everyday example, not an account of observing a particular person’s neurons. Its value lies in distinguishing the event, interpretation, sensation and next action.

Speaking to a familiar audience, someone can joke easily. Before an assessment panel, the same words may disappear and their voice may sound unfamiliar. The stakes, expectations and focus of attention have changed. They are trying to remember the material while also monitoring whether others have noticed their nerves.

Preparation can address specific tasks: shorten the introduction to a few sentences, rehearse transitions between slides, or establish how questions will be handled. Keeping a page of key points nearby means fewer things must be recalled at once.

Nervousness may remain. The aim of preparation is to have accessible supports and a clear sequence of actions even when the occasion matters. Afterwards, recording where the difficulty occurred is more useful than reaching a global verdict about a “weak brain” or personal inadequacy.

After a short night, following an explanation, handling an unexpected change and choosing a response during an argument can be harder. NHLBI describes how insufficient sleep can affect attention, learning, decision-making and emotional management. Effects differ, but bodily state belongs in our assessment of a reaction.

If difficult conversations repeatedly happen late at night, their timing can be reconsidered. If an important mistake follows several nights of too little sleep, self-criticism will not restore rest. Both the mistake and the working conditions need attention: workload, breaks and whether some tasks can be moved.

Fatigue does not excuse humiliating someone. It adds information relevant to responsibility: what should change before a similar occasion, beyond promising never to do it again?

A pause makes time for another action: rereading the question, checking an assumption, requesting clarification or choosing different words. A stopwatch cannot tell us when “the cortex switched on.” We can, however, compare an immediate draft with the reply that remains after rereading.

An initial version might begin, “You’ve dumped everything on me again.” Checking the agreement may lead to something more specific: “Our list had two tasks. A third has now been added. What deadline shall we agree for it?” Anger may remain, but the conversation now has a concrete subject to negotiate.

In danger, protection and getting help take priority over a writing exercise. In an ordinary misunderstanding, a pause can be tried and its usefulness considered in your own circumstances.

Choose one moderately tense occasion for observation. First, briefly record what happened: the exact message, a colleague’s request or a change to an agreement. Separately, note how it was understood at first. The record can then be revisited as new details emerge.

Next, name the feeling and anything noticed in the body. Finish with the action chosen and its outcome. The message example might become: “A conversation was proposed. The first thought was that there was a complaint. Anxiety and tight shoulders were noticed. The subject was clarified. Help with a new task was needed.” In another episode, the complaint may be real; the record can then help establish what it concerns.

After a few days, look for repetition. Uncertainty might be difficult to bear. Reactions might be sharper at the end of a shift. Or a particular person may actually break agreements regularly. A conclusion should follow the episodes rather than a story about yourself selected in advance.

The MriyaRun EQ emotions journal can provide a place for these records: revisiting your words, distinguishing anger from hurt, or fear of an event from uncertainty about it. It is a printed self-reflection tool. Writing does not measure brain activity or establish the condition of the nervous system.

An ordinary notebook is also enough to begin. The format should not become another demand. A few clear sentences about one event can make returning to an experience easier than a beautifully completed page in which the event itself has been lost.

When a diagram promises to explain personality through one region, check what supports it. Are research sources provided? Does the author distinguish an artistic image from anatomy? Does the explanation offer something specific beyond a new label for yourself?

The same questions apply here. The connected city in the illustration is an artistic metaphor; the reflection diagram offers a way to examine an everyday episode. Anatomical information and scientific models have their own sources. Keeping those distinctions visible helps readers recognise established information, generalisation and suggestions for personal exploration.

In everyday life, a more accurate understanding of the brain leaves practical questions: what happened, what was assumed, what state were you in, and what could change next time? There is no need to search for warring creatures within. Attention to circumstances and a willingness to revise the first explanation are more useful starting points.

Cesario, Johnson and Eisthen, Your Brain Is Not an Onion With a Tiny Reptile Inside, 2020, examines the literal triune-brain account. Luiz Pessoa, A Network Model of the Emotional Brain, 2017, discusses interacting systems in emotion. NIMH: Get to Know Your Brain introduces major brain areas. NHLBI: How Sleep Affects Your Health covers sleep and daily functioning. The everyday scenes, recording guide and example phrases were created for this article.