Chapter 70

Improving our Reasoning and Decision Making 

Human intelligence is not a fixed quantity; it is a dynamic set of skills shaped by biology, experience, environment, habits, and motivation. Likewise, decision making is not simply the product of intelligence - it is the result of how well we manage attention, emotion, memory, risk, bias, and social pressures. We live in a world far more complex than the one our ancestors evolved for, yet we rely on mental equipment designed for survival, not clarity. Improving our intelligence and decision-making is therefore not about becoming “smart” in the conventional sense. It is about upgrading the way we think, deliberately choosing our cognitive habits, and learning to work around the predictable biases and limitations of the human mind.

This chapter explores how intelligence operates, what impairs it, and how we can strengthen the cognitive tools that shape our daily choices.

What We Commonly Get Wrong About Intelligence 

Most people imagine intelligence as a single trait measured by IQ, but psychologists have shown for decades that intelligence is multidimensional. It includes:

  • Fluid intelligence: The ability to reason, problem-solve, and learn new patterns.
  • Crystallized intelligence: Knowledge, vocabulary, and experience.
  • Emotional intelligence (EQ): Understanding and managing our emotions and the emotions of others.
  • Practical intelligence: The ability to navigate real-world situations.
  • Social intelligence: Reading people, social cues, and group dynamics. 

Each develops differently and can be improved through intentional practice.

How Our Brains Actually Make Decisions

Decision-making is not a purely rational process. Instead, the brain relies on two interacting systems:

System 1: Fast, automatic, intuitive thinking

  • Quick judgments
  • Heuristics and mental shortcuts
  • Emotional reactions
  • Pattern recognition

System 2: Slow, deliberate, analytical thinking

  • Logical reasoning
  • Planning
  • Critical evaluation
  • Focused attention

We need both systems, but modern life overwhelms System 1 and underutilizes System 2. System 1 keeps us alive; System 2 keeps us wise. When people make poor decisions, it is usually because System 1 is driving without adult supervision.

Bias: The Invisible Enemy of Good Decisions 

As we saw in Chapters 13 and 63, humans rely on cognitive shortcuts to save time and energy. These shortcuts are helpful but often lead to systematic errors. At the risk of repetition, common biases include:

  • Confirmation bias: Seeking information that supports what we already believe.
  • Availability bias: Relying on vivid or recent memories.
  • Anchoring: Clinging to the first number or idea presented.
  • Sunk-cost fallacy: Continuing a bad investment because we’ve already invested.
  • Overconfidence bias: Believing we understand more than we do.
  • Social conformity: Aligning with group beliefs to avoid conflict.

Improving decision-making requires recognizing these biases in ourselves - not just in others.

What Improves Intelligence Across the Lifespan? 

Contrary to old beliefs, the brain remains plastic - capable of learning, changing, and forming new connections well into old age. Neuroscience shows that intelligence is trainable.

  • Working memory training: Stronger working memory correlates with better reasoning, planning, and impulse control.
  • Lifelong learning: Reading, studying, and intellectual challenge increase crystallized intelligence.
  • Physical exercise: Aerobic exercise stimulates brain growth factors (BDNF), improving cognitive function.
  • Sleep: Deep sleep consolidates memory and problem-solving ability.
  • Stress reduction: Chronic stress impairs the prefrontal cortex and reduces cognitive flexibility.
  • Novel experiences: Exposure to new places, ideas, and skills broadens thinking. 

Strengthening Critical Thinking 

Critical thinking is not natural - it must be taught and practiced. Steps include:

  • Slowing down the decision process and creating space for System 2 reasoning.
    • Asking better questions
    • What evidence supports this?
    • What evidence contradicts it?
    • What are the alternatives?
    • What assumptions am I making?
  • Seeking disconfirming information – a deliberate attack on confirmation bias - is a cornerstone of the Scientific Method.
  • Learning basic statistics and probability. Humans are naturally poor at estimating risk.
  • Distinguishing feelings from facts. Emotions should inform decisions but not determine them.
  • Consulting diverse viewpoints. Exposure to differing perspectives increases intelligence and reduces blind spots.


Emotional Intelligence and Decision Making 

We make better decisions when we understand our emotions, recognize the needs driving them, and prevent them from hijacking our reasoning. Emotional intelligence enhances decision quality by:

  • Reducing impulsivity
  • Increasing empathy
  • Improving communication
  • Managing conflict
  • Recognizing manipulation
  • Enabling better risk assessment

Emotional intelligence is a strong predictor of life success - often stronger than IQ.

Social Intelligence and the Influence of Groups 

Humans are profoundly social, and group pressures heavily influence decisions. People often choose:

  • comfort over truth
  • belonging over accuracy
  • loyalty over logic

Understanding these dynamics helps us resist social pressure that leads to poor decisions while using healthy social input to improve judgment.

Practical Tools for Better Decision Making 

Try these techniques:

  • The Pause: A simple 10- to 30-second pause interrupts impulsive reactions.
  • The Pre-Mortem: Imagine a decision has failed and ask why. This reveals overlooked risks.
  • The 10-10-10 Rule: Consider how you’ll feel about your decision in 10 minutes, 10 months, and 10 years.
  • Decision journals: Track decisions and outcomes to reveal patterns, biases, and improvement areas.
  • Second opinions: Not from people who agree with you - but from people who challenge your thinking.
  • Simplifying choices: Too many options overwhelm the mind; reducing complexity improves judgment.
  • Aligning choices with values: Decisions made without reference to values drift toward regret. 

Becoming the Architect of Our Own Thinking. 

Improving intelligence and decision-making is not about achieving perfection. It is about becoming a more deliberate thinker - someone who:

  • Recognizes their biases
  • Listens deeply
  • Asks better questions
  • Evaluates evidence
  • Understands emotion
  • Resists impulsivity
  • Adapts flexibly
  • Learns continuously

Most importantly, it is about reclaiming authorship of our minds. In a world filled with noise, distraction, persuasion, and complexity, the ability to think clearly is a superpower - and a necessity for a meaningful life.

A Final Reflection

Human nature gives us extraordinary cognitive strengths - but also predictable weaknesses. By understanding how our minds work, practicing intentional thinking, moderating emotion, and strengthening our cognitive habits, we can dramatically improve both our intelligence and the quality of our decisions. We cannot control everything, but we can control how we think. And how we think determines how we live.

← Previous      📚 Table of Contents      Next →