October 6 Discussion 2: Psychophysics
Psychophysics
- How perception is studied
- Quantitative relation between stimulus and perception
Absolute vs. Difference Thresholds
- Absolute: intensity for some stimulus to be detectable some percentage of time
- Difference: intensity for difference between two stimuli to be detectable some percentage
of time
Just Noticeable Difference (JND)
- Smallest difference in some stimulus dimension needed to discriminate between two
stimuli
- ALL of the previous methods can be used to identify JNDS
- A relative threshold
