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Have a question about the brain? Send it to us. Each month, a question is selected and a scientist with relevant expertise responds, with answers posted here.

Past Questions and Answers

Does practice make perfect?

Source: Society for Neuroscience
While experts debate the type and length of practice that is optimal for success, one thing is clear: training improves performance and changes the brain.

Why are some people left-handed?

Source: Society for Neuroscience
There are likely advantages to having both left- and right-handed individuals in a population.

Do people with depression experience worse symptoms at certain times of the day?

Source: Society for Neuroscience
People with depression often report dramatic changes in mood over the course of the day.

What are hallucinations?

Source: Society for Neuroscience
Hallucinations emerge when inner thoughts and expectations overpower sensory experience.

How does marijuana affect brain function?

Source: Society for Neuroscience
The main active ingredient in marijuana alters the normal communication between cells and circuits in the brain.

How does the brain use food as energy?

Source: Society for Neuroscience
Just like other cells in the body, brain cells use a form of sugar called glucose to fuel their activities. This energy comes from the foods we consume daily, and is regularly delivered to brain cells through the blood.

SfN welcomes all your brain-related questions.

Every month, we choose one reader question and get an answer from a top neuroscientist. Always been curious about something?