Handbook of Psychology, Volume 4: Experimental Psychology

Psychophysical Methods 99

signal

catch

p(D|signal) p(“Yes”|D)

p(D|signal) p(“Yes”|D)

+

=

hit rate

D

D

D

D

manipulable

“Yes”

“Yes”

“No”

“No”

“Yes”

“No”

“Yes”

“No”

hidden observable

trial

p(D|signal)

p(D|signal)

p(D|catch)

p(D|catch)

p(“Yes”|D)

p(“No”|D)

p(“No”|D)

p(“Yes”|D)

p(signal)

p(catch)

p(D|catch) p(“Yes”|D)

p(D|catch) p(“Yes”|D)

+

=

false alarm rate

p(“No”|D)

p(“Yes”|D)

p(“Yes”|D)

p(“No”|D)

Figure 4.2 The general structure of a detection experiment, assuming two observer states.

signal

catch

[1–p(D|signal)]g

p(D|signal)

+

=

hit rate

D

D

D

“Yes”

“Yes”

“No”

“Yes”

“No”

trial

=

correct rejection rate

1–g

g

=

false alarm rate

[1–p(D|signal)] (1–g)

=

miss rate

Figure 4.3 The structure of a detection experiment, assuming high-threshold theory. This is a special case of the

structure shown in Figure 4.2.