PSYA01H3 Chapter Notes - Chapter 4: Detection Theory, Response Bias, Ganglion Cell
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We(cid:271)e(cid:396)"s te(cid:272)h(cid:374)i(cid:395)ue (cid:449)as all a(cid:271)out fi(cid:374)di(cid:374)g diffe(cid:396)e(cid:374)(cid:272)e th(cid:396)esholds the poi(cid:374)t (cid:449)he(cid:396)e participants can notice a difference. But (cid:449)hat (cid:449)e"d (cid:396)eally like to k(cid:374)o(cid:449) is ho(cid:449) se(cid:374)siti(cid:448)e ou(cid:396) se(cid:374)so(cid:396)y syste(cid:373)s a(cid:396)e that is, (cid:449)hat is the (cid:449)eakest sti(cid:373)ulus they a(cid:396)e se(cid:374)siti(cid:448)e to (cid:449)hat is thei(cid:396) a(cid:271)solute th(cid:396)eshold. So far bias can still have an effect, but it effects both hits and false alarms. The trick here is to use some manipulation that will vary response bias, the test a given su(cid:271)je(cid:272)t u(cid:374)de(cid:396) a (cid:374)u(cid:373)(cid:271)e(cid:396) of le(cid:448)els of the (cid:373)a(cid:374)ipulatio(cid:374) e. g. payoffs. Receptors: eyes, ears, nose, skin, tongue. Humans do not sense all that there is to sense; bats have echo-location, sharks sense minutes electrical currents, rattlesnakes are sensitive to low frequency vibrations, dogs can smell cancer. Iris: the (cid:272)olo(cid:396)ed pa(cid:396)t of you(cid:396) eye it is a(cid:272)tually a (cid:373)uscle that controls the size of the pupil.
