Healthy Brain
Alzheimer’s Brain
Key Differences
Healthy Brain
- Normal hippocampal volume
- Strong neural synaptic connections
- Normal amyloid-beta levels
- Preserved cognitive & memory function
- Stable reasoning, learning & attention
- No neurofibrillary tau tangles
- Balanced neurotransmitter levels
- Stable cortical thickness & brain mass
- Efficient neural communication
Alzheimer’s Brain
- Significant hippocampal shrinkage
- Weakened or lost synaptic connections
- High amyloid plaque accumulation
- Severe memory & cognitive decline
- Tau protein tangles disrupt neurons
- Thinned cortical tissue (atrophy)
- Reduced neurotransmitter activity
- Slowed information processing
- Lower brain metabolism (glucose use)
Analytical Insights
Memory Decline Rate
Alzheimer’s patients show 40–60% faster decline in hippocampal memory formation ability.
Neural Connectivity Loss
Up to 30% of synaptic connections deteriorate, slowing reasoning, learning and responsiveness.
Amyloid Plaques
Beta-amyloid protein buildup blocks neuron communication and triggers inflammatory damage.
Tau Tangles
Tau proteins twist into toxic tangles, collapsing internal neuron transport systems.
Cortical Atrophy
Alzheimer’s brains lose 10–20% cortical mass in decision-making and memory regions.
Neurotransmitter Imbalance
Reduced acetylcholine and dopamine disrupt attention, focus and overall cognition.