An unusual sensation (aura) may precede a temporal lobe seizure, acting as a warning. Not everyone who has temporal lobe seizures has auras, and not everyone who has auras remembers them.
The aura is actually a simple partial or focal seizure — one that doesn't impair consciousness. Examples of auras include:
- A sudden sense of unprovoked fear
- A deja vu experience — a feeling that what's happening has happened before
- A sudden or strange odor or taste
- A rising sensation in the abdomen
Sometimes temporal lobe seizures impair your ability to respond to others (partial complex or focal dyscognitive seizures). This type of temporal lobe seizure usually lasts 30 seconds to two minutes. Characteristic signs and symptoms include:
- Loss of awareness of surroundings
- Lip smacking
- Repeated swallowing or chewing
- Unusual finger movements, such as picking motions
After a temporal lobe seizure, you may have:
- A period of confusion and difficulty speaking
- Inability to recall what occurred during the seizure
- Unawareness of having had a seizure
- Extreme sleepiness
In extreme cases, what starts as a temporal lobe seizure evolves into a generalized tonic-clonic (grand mal) seizure — featuring convulsions and loss of consciousness.
When to see a doctor
Seek medical advice in these circumstances:
- If you think your or your child is having seizures
- When the number or severity of seizures increases significantly without explanation
- When new signs or symptoms of seizures appear
Seek emergency medical care if:
- A seizure lasts more than five minutes
- The person doesn't recover completely or as quickly as usual after the seizure is over
- Seizures keep repeating in a single day
Often, the cause of temporal lobe seizures remains unknown. However, they can be a result of a number of factors, including:
- Traumatic brain injury
- Infections, such as encephalitis or meningitis, or history of such infections
- A process that causes scarring (gliosis) in a part of the temporal lobe called the hippocampus
- Blood vessel malformations in the brain
- Brain tumors
- Genetic syndromes
During normal waking and sleeping, your brain cells produce varying electrical activity. If the electrical activity in many brain cells becomes abnormally synchronized, a convulsion or seizure may occur.
If this happens in just one area of the brain, the result is a focal seizure. A temporal lobe seizure is a partial seizure that originates in one of the temporal lobes.
Over time, repeated temporal lobe seizures can cause the part of the brain that's responsible for learning and memory (hippocampus) to shrink. Brain cell loss in this area may cause memory problems.