Basics of inhibitory and excitatory networks of the brain.

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Voice by: Sue Stern
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The brain is a complex network of billions of neurons. Neurons can be excitatory or inhibitory. Excitatory neurons stimulate others to respond and transmit electrical messages, while inhibitory neurons SUPPRESS responsiveness, preventing excessive firing. Responsiveness or excitability of a neuron is determined by the value of electrical voltage across its membrane. Basically, a neuron is MORE responsive when it has more POSITIVE charges inside; and is LESS responsive when it becomes more NEGATIVE.
GABA is a major INHIBITORY neurotransmitter. Upon binding, it triggers GABA receptors, ligand-gated chloride channels, to open and allow chloride ions to flow into the neuron, making it more NEGATIVE and LESS likely to respond to new stimuli.
Glutamate receptors, another type of ion channel, upon binding by glutamate, open to allow POSITIVELY-charged ions into the cell, making it more POSITIVE and MORE likely to generate electrical signals.
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