9 terms

Signal Detection Theory

a persons ability to pick out a particular stimulus or signal.
influences of sensitivity
intensity of the signal, capacity of sensory organs and the amount of background stimulation/noise
internal noise
the spontaneous random firing of neurons and is always present and constantly fluctuating... it is like the static on radio and tv
responsive criterion
a persons willingness or reluctance to say that a stimulus is present. it the amount of energy needed for a person to justify saying that a signal has occurred
motivation, needs and expectation
responsive criterion reflects
signal detection theory
is a mathematical model of our personal sensitivity and response criterion combined to determine decisions about whether not a near-threshold stimulus has occurred
Why is Signal Detection theory important?
Because it suggests that detecting signals does not depend on stimuli alone. Personal contex in which signals occur also plays a role.
How does eyewittness testimony apply to signal detection theory?
people have response bias
Sensory adaptation
the process by which sensory systems adapt to constant stiumuli by becoming less sensitive to them