This episode widens the lens from individual synapses to whole neural networks. Central nervous system neurotransmission is less about linear pathways and more about integration—multiple signals converging, diverging, and being reshaped in real time. We explore how excitation and inhibition are balanced, how plasticity changes responses over time, and why drugs acting in the CNS often have broad, sometimes unpredictable effects. The aim is to give you a mental model of systems pharmacology in the brain.

Key takeaways you’ll build and reuse throughout the series:

* Integration over isolation: how neurons sum excitatory and inhibitory inputs to determine output.

* Major transmitter systems in context: glutamate and GABA as primary drivers of excitation and restraint, with modulatory systems layered on top.

* Plasticity and adaptation: tolerance, sensitisation, and long-term changes as consequences of repeated drug exposure.

* Network effects: why targeting one receptor can ripple across cognition, mood, movement, and perception.

* Clinical translation: anticipating sedation, cognitive change, seizures, or behavioural effects when intervening in complex circuits.

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