Final 3NN Program.pptx.pdf

Summary

Core Characteristics of the Biological Nervous System

• Number of neurons in the brain: 10^11
• Number of synapses: 10^15
• Brain power consumption: ≈ 20 W
• Synaptogenesis continues throughout life
• Neuron count rises until ~45 years, then gradually declines

Learning Mechanisms in Biological Systems

• Synaptic weight change via a calcium cascade
• Neurotransmitter release into the synaptic cleft
• Modulation by serotonin, dopamine, and noradrenaline
• Memory consolidation occurs during sleep
• The hippocampus acts as a cache for temporary information storage

Neuromodulatory Systems

Serotonin

• Local influence on neuron groups
• Participates in pain regulation
• Modulates learning speed
• Affects emotional state