Doctors assume that after a person has had a single seizure that there’s the possibility of having some sort of abnormality in the brain. This can be either a tumor or a vascular malformation. As a result, a diagnostic test -- usually a magnetic resonance imaging (MRI) scan -- is done to identify the sources of the seizure.
Edgardo C. Gamboa, MD
Location and Office HoursThe Neurology Center
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- How do doctors diagnose the cause of a seizure?
What can cause deja vu?
Michael Roizen, MD, Internal Medicine, answeredOne theory on deja vu is that hyperactive neurotransmitters (e.g., dopamine) that help shuttle information into both short-term memory and long-term memory centers change lanes. The visual memory you are seeing for the first time ends up getting sent directly into long-term memory before it's processed into short-term memory. The result? Your brain "recalls" the image from the long-term memory storage area, which tells you it's a memory from the past, not the present. Deja vu!
Another deja vu theory is that these been-there-done-that feelings are a result of one eye sending information to the brain faster than the other. Almost everyone has a dominant eye. If the stronger eye sends information to the subconscious before both eyes focus and register the input as a conscious experience, your brain will tell you, "I've seen that before." You have, but only a nanosecond ago. Or, maybe you've just "seen" it on the computer or TV.Helpful? 1 person found this helpful.
How does the nervous system help control urination?
May Wakamatsu, MD, Obstetrics & Gynecology, answeredBefore toilet training, a simple reflex controls the timing of urination. Stretch-detecting sensory nerves in the detrusor muscle signal the spinal cord that the bladder is filling with urine. In response, motor nerves from the spine signal the bladder muscles to contract and the urethra and pelvic floor muscles to relax, allowing urination. As the brain matures, it is able to override the spinal nerves' automatic signal for the bladder to empty. The bladder gradually becomes capable of storing greater amounts of urine, and a child learns to urinate when it is convenient and socially acceptable.
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