PSYCH 006: Amino Acid Neurotransmitters

At the heart of neural communication lie a small group of powerful molecules that set the tone of brain activity. This chapter focuses on amino acid neurotransmitters - particularly glutamate and GABA - which together form the fundamental balance between excitation and inhibition.In this episode, we explore how glutamate drives neural activation, enabling signalling, plasticity, and learning, while GABA provides restraint, stabilising circuits and preventing excessive activity. The brain depends on this delicate equilibrium - too much excitation risks instability, too much inhibition risks suppression.We examine how these neurotransmitters act through different receptor systems, shaping both rapid signalling and longer-term modulation. Their influence extends across virtually all brain systems, making them central to both normal function and pathology.Disruptions in this balance are implicated in a wide range of psychiatric conditions - from anxiety and epilepsy to schizophrenia and mood disorders. Rather than isolated dysfunctions, these represent shifts in the overall tone of neural networks.This chapter reframes brain activity as a dynamic negotiation - a continuous balancing act that allows complexity without chaos.Key Takeaways* Amino acid neurotransmitters (primarily glutamate and GABA) are central to brain function.* Glutamate is the main excitatory neurotransmitter; GABA is the main inhibitory neurotransmitter.* Brain function depends on a precise balance between excitation and inhibition.* Different receptor types mediate fast and slow signalling effects.* These systems are widely distributed and influence most neural circuits.* Dysregulation of excitation–inhibition balance is implicated in multiple psychiatric disorders.* Understanding this balance is key to interpreting both symptoms and treatments. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe