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signal-detection theory

signal-detection theory - Signal-detection theory states...

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Signal-detection theory states that in order to detect stimuli, decision and sensory processes need to be looked into and both of these processes are influenced by a variety of factors besides stimulus intensity. In other words, a person's ability or likelihood to detect some stimulus is affected by the intensity of the stimulus(e.g., how loud a noise is) and the person's physical and psychological state (e.g., how alert the person is).There can be four possibilities: hits(detecting signals when they are present), misses(failing to detect signals when they are present), false alarms(detecting signals when they are not present), and correct rejections(not detecting signals when they are absent). For example, suppose a person is expecting an important visitor. As time goes on, the person begins to "hear" the visitor and may open the door, only to find that nobody is there. The person is "detecting" a stimulus, or signal, that is not there because it would be worse to miss
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