Science
Human Brain Quiz
Test your knowledge of the human brain with 50 questions about neurons, memory, consciousness, and neuroscience.
Test your knowledge of the human brain with 50 questions about neurons, memory, consciousness, and neuroscience.
Your brain contains roughly 86 billion neurons forming over 100 trillion synaptic connections — more connections than there are stars in the Milky Way. This quiz draws from a pool of 50 hard-level questions covering brain anatomy, neurotransmitters, memory science, neuroplasticity, consciousness, and neurological disorders.
Each round presents 10 multiple-choice questions at a hard difficulty level. Select your answer, read the instant explanation, and track your score. No timer, no signup — take it as many times as you like with randomized question order.
Questions span the four lobes of the cerebral cortex, key structures like the hippocampus and amygdala, how neurotransmitters such as dopamine and serotonin shape mood and behavior, the science of memory formation and retrieval, groundbreaking research on neuroplasticity, and the mysteries of consciousness and sleep.
The human brain contains approximately 86 billion neurons, according to a landmark 2009 study by neuroscientist Suzana Herculano-Houzel. These neurons form roughly 100 trillion synaptic connections, creating the most complex structure known in the universe.
The brain has a remarkable ability to reorganize itself through neuroplasticity. After injury, surrounding neurons can form new connections to compensate for lost function. Research on London taxi drivers showed that intensive spatial navigation training physically enlarged the hippocampus, and studies at Harvard (2011) demonstrated that meditation can increase gray matter density in just eight weeks.
The hippocampus, located in the medial temporal lobe, plays a critical role in consolidating short-term memories into long-term storage. The cerebellum handles procedural memory (muscle memory), while the amygdala processes emotional memories. Memory is not stored in a single location but is distributed across multiple brain regions.
Last updated: March 2026