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Sensation & Perception

Sensation & Perception. The Lion King. Do you see the message hidden?. Do you see the message hidden?. Do you see the message hidden?. Political Subliminal Message. What impact does this message have? Will it last? Commercial. Subliminal Messages.

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Sensation & Perception

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  1. Sensation & Perception

  2. The Lion King

  3. Do you see the message hidden?

  4. Do you see the message hidden?

  5. Do you see the message hidden?

  6. Political Subliminal Message • What impact does this message have? • Will it last? • Commercial

  7. Subliminal Messages • Hidden messages targeted at our subconscious mind. • Examples: 1. Small images inside a larger picture • 2. An audio message hidden inside a cassette tape • 3. Messages in song played backward • 4. Hidden words or pictures that quickly appear • 5. Powerful marketing tools • Effects us on a emotional level • Short lived results

  8. Sensation & Perception • Sensation- stimulation of the sense organs • Raw data of experience: smells, sights, sounds, pain, etc. • Perception- creating meaning from the raw sensory information

  9. Basic Process • Sensory organs absorb energy from a physical stimulus in the environment • Sensory receptor cells detect stimulus energies and convert them into neural impulses (transduction) • Electrochemical message is sent to the brain • Specific areas of the brain organizes the input and transforms them into something meaningful

  10. Attention • Selective Attention- focusing our awareness on a particular stimuli • Cocktail Party Phenomenon- filter out many sounds to maintain one conversation but will notice your name in another conversation

  11. Psychophysics- how physical stimuli are translated into psychological experience • Gustav Fechner’s work on thresholds • Threshold- is a dividing point between energy levels that do and do not have a detectable effect • Absolute Threshold- minimum amount of stimulation that an organism can detect 50% of the time • Environment can affect detection of a stimulus • Examples of absolute threshold under ideal conditions (pg125 in packet) • Radio EXPERIMENT! • Online demo http://itc.gsw.edu/faculty/gfisk/anim/threshold.swf

  12. JND- just noticeable difference is the smallest difference in the amount of stimulation that a specific sense can detect • The absolute threshold is the jnd from nothing (no stimulus) • JND is greater for stronger stimuli than for weaker ones • As a stimulus increases in magnitude, the JND becomes larger

  13. Weber’s Law- states that the size of a jnd is a constant proportion of the size of the initial stimulus • This portion is called the Weber Fraction • It can apply to all the senses but different fractions apply to different types of sensory input • Ex: Weber fraction for weights is 1/30, which means you should detect the difference btw a 30 ounce weight and a 31 ounce weight • Envelope/Book EXPERIMENT!

  14. Fechner’s Law • The magnitude of a sensory experience is proportional to the # of JNDs that the stimulus causing the experience is above the absolute threshold. • Constant increments in stimulus intensity produce smaller and smaller increases in perceived magnitude of sensation. • EX: Dark room with lamp and three bulbs. • Three equal increases in stimulus intensity produce progressively smaller differences in the magnitude of sensation.

  15. Imagine you are monitoring a radar screen

  16. Signal Detection Theory • The detection of stimuli involves decision processes as well as sensory processes, which are influenced by many factors besides stimulus intensity • Radar Screen with four possible outcomes: • Hits-Detecting signals when present • Misses-Failing to detect signals when present • False Alarms-detecting signals when they are absent • Correct Rejection-Not detecting signals when they are absent

  17. Setting Criterion • You set it for a weak criterion • Depends on our expectations and on the consequences of missing a signal or of reporting a false alarm. • Noise plays a factor, like radio static…the more in your system the more difficult it is to detect the stimulus • Ex: Waiting for the pizza guy at a party.

  18. Sensory Adaptation • Gradual decline in sensitivity to prolonged stimulation • Ex: Garbage • In reality, the stimulus intensity (the odor) stays the same but with continued exposure your sensitivity to it decreases • Ex: Jumping into a swimming pool • It allows people to ignore the obvious but you can notice CHANGES in sensory input • A behavioral adaptation that has been sculpted by natural selection

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