Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
Absolute Threshold
|
A measure of the smallest amount of stimulus energy required for a subject to reliably detect its presence
|
|
Differential Threshold (just noticeable difference)
|
A measure of the smallest change in stimulus level required for a subject to reliably discriminate the direction of stimulus change.
|
|
Psychometric Functions
|
Any plot relating to a quantifiable response to a physical measure.
|
|
Normal Distribution
|
A distribution in which scores fall symmetrically n predictably on either side of the mean score.
|
|
What is known about the exact position of a threshold in relation to a stimulus
|
It can change and is subject to some random fluctuation as a result of momentary variations in neural sensitivity arousal level ect.
|
|
Method of Adjustment
|
A psychophysical procedure in which subjects adjust the value of a stimulus to estimate their threshold.
|
|
Method of constant stimuli
|
A psychophysical procedure in which preselected stimuli are presented in random order over a series of trials; the subject makes a binary response after each trial. yes or no/1 or 2 (better than adjustment)
|
|
Signal Detection Theory (STD)
|
A theory of performance in psychophysical experiments in which subjects' decisions are determined by their sensory response and by a tendency to respond in a certain way. It recognizes bias.
|
|
Yes/no task
|
A psychophysical procedure in which only 50% of presentations contain a stimulus and the subject must respond "yes" or "no".
|
|
Forced Choice Task
|
A psychophysical procedure in which each presentation contains intervals, only one of which (randomly selected) contains the stimulus; the subject must select the correct interval.
|
|
d-prime (d')
|
A measure of stimulus sensitivity based on signal detection theory, it represents the increase caused by the presence of stimulus.
|