The document discusses electroencephalography (EEG), which is the study of the electrical activity of the brain. EEG measures this electrical activity through electrodes placed on the scalp. The brain consists of four main parts: the cerebrum, cerebellum, medulla oblongata, and spinal cord. There are two types of action potentials in the brain - inhibitory postsynaptic potentials (IPSPs) and excitatory postsynaptic potentials (EPSPs) - which influence the likelihood of a neuron firing. Evoked potentials are also discussed, which are electrical changes in the brain in response to external stimuli like light or sound.

1. MEDICAL
ELECTRONICS
EC8073
Faculty Handled By:
Mrs.P.Sivalakshmi AP/ECE
Section: A & B
FIFTH SEMESTER-III YEAR- (2019-2023 BATCH)
SESSION:7
DATE: 03.09.2021

2. ELECTROENCEPHALOGRAPHY
• Electro Encephalography is the study of the electrical activity of the brain.
• The biological name of the brain is Encephalon.
• In EEG measurement, electrical activity of brain is measured from electrodes which are
placed on the scalp.
The brain consists of four parts
 Cerebrum
 Cerebellum
 Medulla oblongata
 Spinal cord

6. Action Potential of the brain
1.Synaptic Potential
1. Inhibitory Post Synaptic Potential (IPSP)
2. Excitatory Post Synaptic Potential(EPSP)
• If the transmitter substance is inhibitory, then the membrane potential of the receptor neuron increases in a
negative direction. So that it is less likely to discharge. This induced potential change is called as Inhibitory Post
Synaptic potential(IPSP)
• If the transmitter substance is exhibitory, then the receptor membrane potential will increase in a positive
direction. So that it is more likely to discharge and produce a spike potential. This induced potential change is
called as Excitatory Post Synaptic Potential.
2.Evoked Potential
• These are the potentials developed in the brain as the responses to external stimuli like light, sound, etc.
• The external stimuli are detected by sense organs that cause some changes in the electrical activity of the brain. The
term “Event Related Potential” is also used, because these are some changes that are evoked by an external
stimulus, but are related to an event.