What do psychophysical methods involve?

	a)	Measuring the functioning of sensory and perceptual systems.
	b)	Assessing anxiety, stress and memory.
	c)	Assessing social attitudes and advertising effectiveness.
	d)	All of the above.
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What is "noise"?

	a)	The level of intensity of the stimulus.
	b)	The auditory threshold of the individual.
	c)	The detection threshold.
	d)	Informational loss (garbage) at any level in the system.
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With regard to stimulus presentation, which of the following statements is false?

	a)	The magnitude of the sensation felt by the subject is variable.
	b)	The magnitude of the sensation felt by the subject is constant.
	c)	The probability of detecting any given stimulus is measured by presenting the stimulus repeatedly.
	d)	All of the above.
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With regard to stimulus detection, which of the following statements is true?

	a)	It is assumed that weak stimuli are detected because they activate the sensory system more effectively.
	b)	The term threshold refers to the dividing line between correct and incorrect performance.
	c)	The notion of an absolute threshold (all or none detection of the stimulus) is the basis on which this method is implemented.
	d)	All of the above.
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In figure 9.1, what does a steep slope in the graph represent?

	a)	Low noise.
	b)	High noise levels.
	c)	A consistently inaccurate response to the stimuli.
	d)	The subject is making many errors in detecting the stimulus.
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What term describes the situation when "over many presentations of the same stimulus, the probability distribution is shifted to the right"?

	a)	A Gaussian Curve.
	b)	Signal plus noise distribution.
	c)	Detection threshold.
	d)	Difference threshold.
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According to signall detection theory, the criterion is...

	a)	The level at which the signal is detected.
	b)	The level above which signals are detected.
	c)	The level below which signals are detected.
	d)	All of the above.
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