The Brain

Brain Hemispheres

The brain is divided in half, through the middle, and we call these hemispheres.

The Left Hemisphere (Blue)

This half is often associated with:

• Language processing (for most people)
• Logical reasoning
• Analytical tasks
• Controlling the right side of the body

Both hemispheres work closely together, and most activities involve networks across the whole brain.

The Lobes

The brain is divided into 4 lobes. Each lobe is responsible for separate processes.

Cerebrum

The cerebrum controls higher brain functions like thinking, action, and decision-making.

Cerebellum

The cerebellum coordinates movement, posture, and balance. It refines motor skills and enables smooth, controlled motion.

Brainstem

Connects the brain to the spinal cord and controls vital life functions.

The Limbic System

This system processes emotions, memory, and arousal. It includes several interconnected parts:

Autonomic Nervous System (ANS)

Controls involuntary functions like heartbeat, digestion, and breathing.

• Heart rate
• Digestion
• Respiratory rate
• Blood pressure

Split into two main branches:

• Sympathetic (Fight or Flight)
• Parasympathetic (rest and digest)

Neurotransmitters

Chemical messengers that pass signals between neurons. Each one affects mood, motivation, and more.