Sensation and Perception Sensation your window to the

Sensation and Perception Sensation: your window to the world Perception: interpreting what comes in your window.

Weber’s Law • Computes the Just Noticeable Difference. • The change needed is proportional to the original intensity of the stimulus. • The more intense the stimulus the more change is needed to notice the difference. • 8% for vision.

Absolute Threshold • The minimum stimulation needed to detect a stimulus 50% of the time.

(Just Notable Difference) Difference Threshold The smallest amount of change needed to detect in a stimulus before we detect a change

Subliminal Messages Do you hear “In the Middle of the night, just to hear them say? ” Or…”Satan he hears this. He had me believe in him? ” Do you hear “…tell you it’s fair, so beat it? ” Or…”I believe it was Satan in me? ” Do you hear “Treasures there? ” Or…“I am Satan? ” • Stimuli below our absolute threshold. • Backmasking • Do subliminal messages work? • Probably a placebo effect?

Not Just Auditory…Also Visual! • In print advertising…. .

And in Commercials Too… Did you see it? ? ?

Does It Really Work? • Darren Brown – the Illusionist, hypnotist, mentalist, painter, writer and skeptic • You will see more of him this year • “Trick of the Mind, ” “Trick or Treat” and “Mind Control” • He states that he achieves through, “magic, suggestion, psychology, misdirection and showmanship. ” • Watch this clip, do more research and tomorrow turn in a reaction telling me if you think subliminal messaging works and why/why not?

End Day 1 • Today you were introduced to the following words/people/concepts: – – – • Proprioception Transduction Psychophysics Absolute threshold Difference threshold Signal detection (theory) – Subliminal – Just noticeable difference (JND) – Weber’s Law – Sensory adaptation – Selective attention – Fechner – Weber You should KNOW the ones in green