Which of the following laws breaks down at very low and very high intensities of stimulation? Signal Detection Theory Absolute Threshold Theory Weber's Law Steven's Power Law
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This means that as the intensity of a stimulus increases, the JND also increases. Show more…
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5. The minimal amount needed to sense and object through, sight, smell, hearing, taste, touch, etc. a. Difference threshold b. Signal detection theory c. Absolute threshold d. Perception 6. The larger or stronger a stimulus, the larger the change required for a person to notice that anything has happened to it. a. Kinesthesis b. Weber's Law c. Signal detection theory d. Psychophysics
Adi S.
Weber's law, a concept taught in most Introduction to Psychology courses, states that the ratio of the intensity of a stimulus to the "just noticeable" increment in intensity is constant, that is, the ratio doesn't depend on the intensity of the stimulus. The ratio is called the "Weber fraction," so a concise statement of Weber's law is that "the Weber fraction is constant, regardless of the stimulus intensity." It turns out that Weber's law is not so much a law as it is a rule of thumb, since it is violated in many situations. For instance, for some auditory stimuli, the Weber fraction does depend systematically on the stimulus intensity. The following bivariate data are the experimental data obtained for one listener in an auditory intensity discrimination task. For each of the ten stimulus intensities x (in decibels), the Weber fraction y (in decibels) is shown. Figure 1 is a scatter plot of the data. Also given is the product of the stimulus intensity and the Weber fraction for each of the ten stimuli. (These products, written in the column labelled "xy", may aid in calculations.)
Which of the following statements is true of the signal-detection theory? a. A stimulus appears to be in constant flux due to the inability of human senses to perceive the full spectrum of any sensory input. b. The relationship between a physical stimulus and a sensory response is fully mechanical. c. The intensity of a signal is one factor that determines whether people will perceive sensory stimuli or a difference between signals. d. The signal received from an unidentified source cannot be perceived without having prior knowledge about the source.
James K.
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