Inattentional Blindness: What else are we missing?

To answer that question, I’ll need to explain a part of the brain called the Limbic System.

Within the brain there is a set of structures called the limbic system. There are several important structures within the limbic system: the amygdala, hippocampus, thalamus, hypothalamus, basal ganglia, and cingulate gyrus. The limbic system is among the oldest parts of the brain in evolutionary terms. It’s not just found in humans and other mammals, but also fish, amphibians, and reptiles.

The limbic system is the part of the brain involved in our behavioural and emotional responses, especially when it comes to behaviours we need for survival: feeding, reproduction and caring for our young, and fight or flight responses (https://qbi.uq.edu.au/brain/brain-anatomy/limbic-system).

The limbic system contains the brain’s reward circuit or pathway. The reward circuit links together several brain structures that control and regulate our ability to feel pleasure (or “reward”). The sensation of pleasure or reward motivates us to repeat behaviours. When the reward circuit is activated, each individual neuron (nerve cell) in the circuit relays electrical and chemical signals.

In a healthy world without addictive manufactured drugs, humans survive and thrive when they are rewarded for certain behaviours (cleaning, hard work, sex, eating, achieving goals etc), hence evolution has provided us with this feel-good chemical so that we will repeat pleasurable behaviours.

There is a gap between neurons called the synapse. Neurons communicate with each other by sending an electro-chemical signal from one neuron (pre-synaptic neuron) to the next (post-synaptic neuron). In the reward circuit, neurons release several neurotransmitters (chemical messengers). One of these is called dopamine. Released dopamine molecules travel across the synapse and link up with proteins called dopamine receptors on the surface of the post-synaptic neuron (the receiving nerve cell). When the dopamine binds to the dopamine receptor, it causes proteins attached to the interior part of the post-synaptic neuron to carry the signal onward within the cell. Some dopamine will re-enter the pre-synaptic nerve cell via dopamine transporters, and it can be re-released.

When a reward is encountered, the pre-synaptic nerve cell (neuron) releases a large amount of dopamine in a rapid burst. Dopamine transporters will remove “excessive” amounts of dopamine naturally within the limbic system. Dopamine surges like this help the brain to learn and adapt to a complex social and physical world.

Drugs like methamphetamine (a stimulant drug) are able to “hijack” this process contributing to behaviours which can be considered unnatural or potentially dysfunctional. A range of consequences can follow.

When someone uses methamphetamine, the drug quickly enters the brain, depending on how the drug is administered. Nevertheless, meth or ice is quick acting. Meth blocks the re-entry of dopamine back into the pre-synaptic neuron – which is not what happens naturally. This is also what cocaine does to the brain. However, unlike cocaine, higher doses of meth increase the release of dopamine from the presynaptic neuron leading to a significantly greater amount of dopamine within the synapse. Higher doses of cocaine will not release “more dopamine” from the pre-synaptic neuron like meth does. This is why after about 30 minutes or so, people who use cocaine will need more to maintain the high.

Dopamine gets trapped in the synapse (space between nerve cells) because the meth (like cocaine) prevents “transporters” from removing it back into the cell it came from. The postsynaptic cell is activated to dangerously high levels as it absorbs so much dopamine over a long period of time. The person using meth experiences powerful feelings of euphoria, increased energy, wakefulness, physical activity, and a decreased appetite.

When an unnatural amount of dopamine floods the limbic system like this over a long period of time, without reabsorption, then our brain is not replenished with dopamine, hence people who use meth often (even on a single occasion) may feel unmotivated, depressed, joyless, and/or pointlessness when they stop using. Figuratively speaking, the brain is “empty” or low on dopamine fuel, and it will take time to for dopamine to return to baseline levels and replenish itself. This may motivate the user to seek more methamphetamine to return to “normal”.

Methamphetamine can also cause a variety of cardiovascular problems, including rapid heart rate, irregular heartbeat, and increased blood pressure. Hyperthermia (elevated body temperature) and convulsions may occur with methamphetamine overdose, and if not treated immediately, can result in death (What are the immediate (short-term) effects of methamphetamine misuse? | National Institute on Drug Abuse (NIDA) (nih.gov))

SIGNS OF SUBSTANCE MISUSE OR ADDICTION

• Finding it difficult to meet responsibilities.
• Withdrawing from activities or not enjoying activities that used to provide satisfaction e.g. work, family, hobbies, sports, socialising.
• Taking part in more dangerous or risky behaviours e.g., drink driving, unprotected sex, using dirty needles, criminal behaviour.
• Behaviour changes e.g., stealing, exhibiting violence behaviour toward others.
• Conflict with partner/family/friends, losing friends.
• Experiencing signs of depression, anxiety, paranoia, or psychosis.
• Needing more substance to experience the same effects
• Cravings and urges to use the substance and symptoms of withdrawal when not using the substance.
• Having difficulty reducing or stopping substance use.
• Regretting behaviours while under the influence and continuing to use again.

(Substance abuse, misuse and addiction | Lifeline Australia | 13 11 14)

Love isn’t a single chemical but it does involve powerful chemicals in your body. When people say “love is just chemicals,” that’s oversimplified. Love is a complex emotional and psychological experience, but it’s strongly influenced by brain chemistry.

Here are the main chemicals involved:

1. Dopamine — the reward chemical

This is linked to pleasure, motivation, and craving. When you’re attracted to someone, dopamine spikes, which is why love can feel exciting, addictive, and energising.

2. Oxytocin — the bonding hormone

Often called the “love hormone.” It’s released during physical touch, cuddling, sex, and even deep conversation. It helps create feelings of trust, attachment, and emotional closeness.

3. Vasopressin — attachment chemical

Plays a role in long-term bonding and pair attachment, especially in committed relationships.

4. Serotonin — mood regulator (also influences sleep, appetite, digestion and cognition)

Serotonin activity (or “signalling”) can shift during early romantic attraction, which may explain why you obsessively think about someone in the early stages.

5. Adrenaline & norepinephrine

These create the physical symptoms: racing heart, sweaty palms, butterflies.

Love isn’t just chemistry — but chemistry is part of how your brain creates the feeling. Think of it like this:

• Chemicals are the mechanism.
• Love is the experience.

Being “in love” isn’t always a big, dramatic lightning-bolt moment. It’s usually a mix of feelings, attachment, and a steady choice to be with someone. Here are some signs that often point to real love rather than just attraction or a crush:

1. You care about who they are, not just how they make you feel

You genuinely admire their character, values and quirks — even their flaws. You’re not just chasing the excitement; you actually like them as a person.

2. Their happiness matters to you

You want good things for them, even when it doesn’t directly benefit you. When they’re struggling, it affects you too.

3. You feel safe being yourself

You don’t feel like you have to put on an act. You can be honest, vulnerable and imperfect, and still feel accepted.

4. You naturally think long-term

When you picture the future, they’re in it — not because you’re forcing it, but because it just feels right.

5. It’s not only intense — it’s steady

A crush can feel all butterflies and nerves.
Love often feels calmer underneath it all — grounded, warm and secure.

6. You choose them

Even on the ordinary days. Even when they annoy you a bit. Love isn’t just a feeling; it’s a consistent decision to stay connected. A couple of questions you might ask yourself:

• If the excitement settled down, would I still want them around?
• Do I respect them?
• Do I feel more like myself with them — or less?

Love doesn’t always feel dramatic. Sometimes it’s quiet and steady — and that can be just as real.

Psychologists believe that the core issues of anorexia nervosa and bulimia nervosa are multifaceted, involving a combination of biological, psychological, and social factors. Here are some of the key issues:

Anorexia Nervosa

1. Distorted Body Image: Individuals with anorexia often have a distorted perception of their body size and shape, seeing themselves as overweight even when they are underweight.
2. Intense Fear of Gaining Weight: There is an overwhelming fear of gaining weight or becoming fat, which drives restrictive eating behaviors.
3. Control Issues: Anorexia can be a way for individuals to exert control over their lives, especially if they feel powerless in other areas.
4. Perfectionism: Many individuals with anorexia have perfectionistic tendencies, striving for an unattainable ideal of thinness.
5. Emotional Regulation: Restricting food intake can be a way to manage or numb difficult emotions and stress.

Bulimia Nervosa

1. Binge-Purge Cycle: Bulimia is characterized by cycles of binge eating followed by purging behaviors such as vomiting, excessive exercise, or misuse of laxatives.
2. Body Dissatisfaction: Similar to anorexia, individuals with bulimia often have a negative body image and are preoccupied with their weight and shape.
3. Impulsivity: Bulimia is often associated with impulsive behaviors and difficulties in regulating emotions.
4. Shame and Guilt: After binge eating, individuals with bulimia often feel intense shame and guilt, which perpetuates the cycle of purging3.
5. Co-occurring Mental Health Issues: Anxiety, depression, and other mental health disorders are commonly seen in individuals with bulimia.

Both disorders are complex and can have severe physical and psychological consequences. Treatment typically involves addressing these core issues through therapy, medical monitoring, nutritional counselling, and support groups.