BQCA is primarily used in research applications, particularly in the field of neuroscience and pharmacology. It acts as a positive allosteric modulator of the M1 muscarinic acetylcholine receptor, which makes it valuable for studying cognitive functions and memory-related processes. Researchers utilize BQCA to investigate its potential in treating neurodegenerative diseases like Alzheimer's, as it enhances receptor activity without directly activating it. Additionally, it is employed in experimental studies to understand the role of M1 receptors in synaptic plasticity and neural signaling. Its selective modulation makes it a useful tool for exploring therapeutic interventions targeting the cholinergic system.