The Five Senses In the Brain
Neurological DisordersLesson 4.6
What causes epilepsy?
Do Now:Examine the circuit below. The two red neurons are excitatory and the two blue neurons are inhibitory.
What effect would removing the two blue inhibitory neurons have on this circuits activity? +--+Removing Inhibition: The Effect LocallyXX+--+
Removing Inhibition: The Effect DistantlyXXLocalDistant+--+++Can anyone think of a condition caused by abnormal disordered neuronal activity?
EpilepsyChronic neurological condition that results in unprovoked seizures.
Seizures are the changes in behavior caused by disordered abnormal electrical activity in the brain.
Symptoms of SeizurePositiveAcquiring an abnormal behaviorEx. Jerking an arm
NegativeLosing a normal behaviorEx. Temporary loss of sight
Normal VisionLoss of Vision7Symptoms of Seizure
VisualAuditorySomatosensoryMotor in limbsMotor in face and head8Types of SeizuresPartial SeizuresOccur when abnormal electrical activity remains in a limited area of the brain
Generalized SeizuresOccur when abnormal electrical activity extends throughout the entire brain9Partial SeizureOriginate within a small group of neurons called a seizure focusStart due to loss of inhibitory control
Partial Seizure: Spread from Seizure FocusSeizure FocusThalamus11
Partial Seizure: Spread from Seizure FocusSeizure FocusThalamus12Generalized SeizuresOriginate within the thalamusStart simultaneously in both sides of the brain
Thalamus13Measuring SeizuresEEG measures the electrical activity of the brain.
Measuring SeizuresEEG measures the electrical activity of the brain.Placement of ElectrodesF Frontal LobeT Temporal LobeP Parietal LobeO Occipital LobeC Motor CortexNumber systemOdd Left hand sideEven Right hand side
EEG measures the electrical activity of the brain.
Measuring SeizuresNormal Partial SeizureGeneralized Seizure
FP1-F7F7-T7T7-P7P7-O1FP2-F8F8-T8T8-P8P8-O2FP1-LCheekLCheek P1FP2-RCheekRCheek P2Patient 3
TreatmentMedicinesSurgeryVagus Nerve Stimulation