PS102 Lecture Notes - Lecture 3: Absolute Threshold, Radiography, Additive Color
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Our (cid:448)isio(cid:374) does(cid:374)"t see e(cid:448)er(cid:455)thi(cid:374)g (cid:894)(cid:271)li(cid:374)d spot is (cid:449)here the opti(cid:272) (cid:374)er(cid:448)e is(cid:895) Sensory transduction = converting info in environment into neural impulses. Two kinds of threshold: absolute threshold. Difference between not being able to perceive a stimulus and being able to just barely perceive it. Minimum amount of sensory stimulation that can be detected 50% of the time (you know something is now present) Feeli(cid:374)g a fl(cid:455)"s (cid:449)i(cid:374)g o(cid:374) (cid:455)our (cid:272)heek. Seeing a candle lit up in the dark far away. Hearing the clock tick from a far: difference threshold. Smallest increase or decrease in a stimulus that is require to notice a difference. Difference that is detectable 50% of the time. You can hear the radio from the other room, they turn it up a bit more and you are able to notice that. Become less sensitive to an unchanging sensory stimulus over time. Ca(cid:374)"t fo(cid:272)us o(cid:374) e(cid:448)er(cid:455)thi(cid:374)g, (cid:272)a(cid:374) o(cid:374)l(cid:455) fo(cid:272)us o(cid:374) o(cid:374)e thi(cid:374)g for so lo(cid:374)g.
