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Color-bar shows the relative contribution to the discriminability by each dimension. These are computed by numerical methods [1]. The sensitivity index or discriminability index or detectability index is a dimensionless statistic used in signal detection theory. A higher index indicates that the signal can be more readily detected.
The sensitivity index or d′ (pronounced "dee-prime") is a statistic used in signal detection theory. It provides the separation between the means of the signal and the noise distributions, compared against the standard deviation of the noise distribution.
Detection theory or signal detection theory is a means to measure the ability to differentiate between information-bearing patterns (called stimulus in living organisms, signal in machines) and random patterns that distract from the information (called noise, consisting of background stimuli and random activity of the detection machine and of the nervous system of the operator).
The ROC curve was first used during World War II for the analysis of radar signals before it was employed in signal detection theory. [55] Following the attack on Pearl Harbor in 1941, the United States military began new research to increase the prediction of correctly detected Japanese aircraft from their radar signals. For these purposes ...
This implies that a good decision-maker needs to be properly biased in most real-world situations; this is the most critical and relevant insight from signal detection theory on classification and decision making. Figure 2. The higher section of the figure illustrates the assumptions of signal-detection theory in a binary decision task.
In modern psychology, vigilance, also termed sustained concentration, is defined as the ability to maintain concentrated attention over prolonged periods of time. [1] During this time, the person attempts to detect the appearance of a particular target stimulus. The individual watches for a signal stimulus that may occur at an unknown time.
Ideal observer analysis is a method for investigating how information is processed in a perceptual system. [1] [2] [3] It is also a basic principle that guides modern research in perception. [4] [5] The ideal observer is a theoretical system that performs a specific task in an optimal way. If there is uncertainty in the task, then perfect ...
Massachusetts Institute of Technology. BBN Technologies. John A. Swets (19 June 1928 – 6 July 2016) was a psychologist. He played a key role in the adaptation of signal detection theory first to the psychology of perception [2][3] and later as a central tool in medical diagnostics. [4] He was a member of the National Academy of Sciences.