What does glutamate do?

• A. Slows you down
• B. Stabilizes mood
• C. Speeds you up
• D. Improves memory

Answer: (C)

Glutamate is the brain’s primary excitatory neurotransmitter, meaning it increases the rate of neuron firing and speeds up neural signaling. This heightened excitation boosts arousal and quick mental processing, which is why it’s described as “speeds you up.” Glutamate also plays a key role in learning and memory through synaptic plasticity, particularly via NMDA and AMPA receptor activity, which underpins how experiences are encoded.

The other options don’t capture the main action of glutamate. It isn’t primarily about slowing you down (that’s the job of inhibitory systems like GABA) or stabilizing mood (which involves multiple neurotransmitters beyond glutamate). While glutamate is involved in the processes of memory formation, the best single description of its core effect is its excitatory, speeding influence on neural activity.