Chap1

Question 1

what is the difference between psychophysics and neuroscience studies about perception?

Answer 1

psychophysics: stimulus is correlated perception.
Neuroscience: stimulus can be a cause for physiology and correlate with perception.

Question 2

what is the difference between sensation and perception?

Answer 2

○ sensation involves detecting elementary properties of a stimulus, and perception involves the higher brain functions involved in interpreting events and objects.

Question 3

What is the field of psychophysics?

Answer 3

Psychophysics is the study of how physical stimuli are related or translated into psychological experience. Only studied the descriptive correlation whether it was linear or not.

Question 4

• How does the change in a physical stimulus correlate with the change in the psychological experience of it?

Question 5

• Can the relationship between stimulus and psychological experiences be modelled by a math equation?

Answer 5

Yes, the relationship is described by Weber’s law and
Fechner’s law

Question 6

what is absolute threshold?

Answer 6

• The minimum amount of stimulation that an organism can detect or the intensity level at which the
  probability of detection is 50%

Question 7

what is the method of limits?

Answer 7

When the person can see the light (descending order; from the strongest to the weakest order).
Ø The experimenter presents a stimulus in either increasing or decreasing intensity.
The participant indicates whether the stimulus is detected by choosing a YES/NO response

Question 8

describe The method of adjustment?

Answer 8

The participant adjusts the intensity of a stimulus continuously (e.g., by turning a knob) until he/she can just barely detect the stimulus.
* The adjustment is in descending order and then in ascending order.

Question 9

Method of constant stimuli (less biased)?

Answer 9

The intensities of the stimuli are presented in random order (rather than in ascending or descending order).

Question 10

> how the Measuring grating acuity works?

Answer 10

the smallest width of lines that the participants can detect.

Question 11

what is he oblique effect?

Answer 11

When grating acuity is assessed at different
orientations, the results show that acuity is best for gratings oriented vertically or horizontally.

Question 12

what is threshold based on Weber’s law?

Answer 12

the size of a just noticeable difference is a constant proportion of the size o the initial stimulus.

Question 13

Just the noticeable difference?

Answer 13

in the amount of stimulation is the threshold.