EEG Essentials

Question 1

Despolarizações superficiais geram uma onda ____________(negativa/positiva), ao passo que despolarizações profundas geram ondas _________(negativa/positiva)

Answer 1

Despolarizações superficiais: Onda positiva

Despolarizações profundas ondas negativas

Question 2

negative potentials are __going waves, and positive potentials are __going waves.

Answer 2

Upgoing
Downgoing

Question 3

What is the resting membrane potential of neurons?

Answer 3

-70mV

This value indicates the electrical potential difference across the neuronal membrane at rest.

Question 4

How do action potentials arise in neurons?

Answer 4

Through depolarization promoted by EPSPs

EPSPs are excitatory postsynaptic potentials that facilitate the generation of action potentials.

Question 5

What do EEG electrodes measure?

Answer 5

The summation of many EPSPs or IPSPs over at least a 6cm square region of cortex

This measurement reflects the collective electrical activity of a large number of neurons.