EDA

Question 1

What does EDA stand for?

Answer 1

Electrodermal activity

Question 2

What is the formula that relates current (I), electromotive force (E), and resistance (R)?

Answer 2

I = E / R = E * G

Question 3

What is galvanic skin resistance (GSR)?

Answer 3

Resistance of the skin between two electrodes calculated from current and electromotive force

Question 4

What is the method called when electrical current is applied to measure skin resistance?

Answer 4

Exosomatic method

Question 5

What is galvanic skin potential (GSP)?

Answer 5

Voltage between two electrodes assessed without applying electrical current

Question 6

What is the method called when measuring skin potential without current application?

Answer 6

Endosomatic method

Question 7

What is the normal range of human skin conductance values?

Answer 7

1 to 20 uS

Question 8

In the BIOPAC system, what constant voltage is maintained between the two electrodes?

Answer 8

0.5 V DC

Question 9

How is the amount of current related to conductance in the BIOPAC system?

Answer 9

The current is proportional to the conductance (1/R)

Question 10

Fill in the blank: Electrodermal activity (EDA) includes both galvanic skin resistance (GSR) and _______.

Answer 10

galvanic skin potential (GSP)

Question 11

True or False: The measurement of conductance is usually preferred to resistance.

Answer 11

True

Question 12

What part of the body is primarily used for measuring EDA?

Answer 12

The skin of the inner surface of the palms

Sometimes the soles are also used.

Question 13

What type of glands are particularly rich in the palms and soles?

Answer 13

Eccrine sweat glands

Question 14

What is the post-ganglionic neurotransmitter for eccrine glands?

Answer 14

Acetylcholine

Question 15

How does sympathetic activation affect the skin?

Answer 15

It changes sweating and blood flow, impacting EDA

Question 16

What characterizes higher levels of sympathetic activation?

Answer 16

Increased skin conductance or decreased resistance

Question 17

What is the major function of regular eccrine glands?

Answer 17

Thermoregulation

Question 18

What is the primary function of eccrine glands in the palms and soles?

Answer 18

Activated primarily by psychological stimuli

Question 19

What is one theory about the original function of sweating in the palms and soles?

Answer 19

Aids grasping by increasing wetness to reduce slipperiness

Question 20

What is the typical placement for electrodes when measuring EDA?

Answer 20

On the palmar surface of two fingers

Question 21

What should be done to the skin before electrode placement?

Answer 21

Washed with soap but not abraded

Question 22

What is the observable delay in the onset of the EDA response?

Answer 22

1-3 seconds

Question 23

How long does it take for the EDA response to reach its peak value?

Answer 23

Further 1-3 seconds

Question 24

What type of changes in conductance are usually measured in laboratory experiments?

Answer 24

Short-term (phasic) changes

Question 25

What is the typical amplitude range of changes in conductance?

Answer 25

Between 0.2 and 1 uS

Question 26

What can cause artefacts during EDA measurement?

Answer 26

Loose electrode placement, finger movement, or deep breaths

Question 27

What does EDA stand for?

Answer 27

Electrodermal Activity

EDA is a measure of the electrical conductance of the skin, which varies with moisture level.

Question 28

Who is associated with the early use of EDA in the clinical field?

Answer 28

Jean Charcot

Charcot was a famous neurologist known for his work on neurological disorders.

Question 29

What aspects of human behavior has EDA been widely used to research?

Answer 29

• Emotions
• Arousal
• Alertness
• Attention
• Cognitive load

EDA reflects sympathetic activation and can indicate various emotional and cognitive states.

Question 30

What is the relationship between EDA lability and sustained attention tasks?

Answer 30

Electrodermally labile people perform better than stabiles

EDA lability indicates a better ability to allocate information processing capacity to stimuli of interest.

Question 31

How is EDA lability associated with emotional expression?

Answer 31

Lower levels of expression of emotions and higher levels of agreeability

This suggests greater control over affective impulses.

Question 32

What psychological condition is associated with altered EDA?

Answer 32

Psychopathy

Individuals with psychopathy exhibit specific patterns in EDA responses.

Question 33

What are some characteristics of EDA in people with psychopathy?

Answer 33

• Lower tonic EDA levels
• Less spontaneous fluctuations
• Less intense responses to novel and/or aversive stimuli

These characteristics lead to impaired learning of aversive stimuli, such as punishment.

Question 34

What does electrodermal response represent in polygraphic lie-detection?

Answer 34

One of the most important modalities

Lie-detection methods often use changes in psychophysiological patterns to reveal emotionally sensitive topics.

Question 35

True or False: EDA is only used for measuring emotional responses.

Answer 35

False

EDA is also used in research on arousal, attention, and cognitive load.

Question 36

Fill in the blank: EDA responses can reflect both _______ and _______ central processes.

Answer 36

[affective-evaluative], [motor-cognitive]

This dual reflection can complicate the interpretation of EDA results.