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Sensation

Sensation. Sensation Information coming into our brain from our sensory receivers. Scientific Names for the Six Senses. Seeing: Visual Hearing: Auditory Tasting: Gustatory Smelling: Olfactory Sense of Touch: Tactile Balance: Vestibular. Psychophysics.

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Sensation

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  1. Sensation

  2. Sensation Information coming into our brain from our sensory receivers

  3. Scientific Names for the Six Senses • Seeing: Visual • Hearing: Auditory • Tasting: Gustatory • Smelling: Olfactory • Sense of Touch: Tactile • Balance: Vestibular

  4. Psychophysics • Psychophysics: study of the relationship between physical characteristics of stimuli and our psychological experience of them • Light - brightness • Sound - volume • Pressure - weight • Taste - sweetness

  5. Thresholds Absolute Threshold Minimum stimulation (weakest level) needed to detect a particular stimulus 50% of the time Vision: Flame of a candle seen 30 miles away on a dark and clear night Hearing: Ticking of a watch from 20 feet away Taste: 1 teaspoon of sugar in 2 gallons of water Smelling: 1 drop of perfume diffused in a 3 bedroom apartment Touch: A bee’s wing falling on your cheek from a distance of 1 centimeter

  6. Subliminal Stimulation/Messages Messages presented below absolute thresholds – not consciously perceived http://www.youtube.com/watch?v=73fCLx-mFLg • Some have argued that humans still “pick up” these messages that influence our “unconscious.” Do these messages have suggestive powers? • Skeptics argue “Subliminal Messages” are heavily influenced by top down processes. • Example: Feeling “hungry” during subliminal advertisements.

  7. Difference Threshold Minimum difference between any two stimuli that a person can detect 50% of the time Weber’s Law: The greater or stronger the stimulus, the greater the change required to notice that a change has occurred. The two stimuli must differ by a constant minimum percentage (rather than a constant amount), to be perceived as different. Just Noticeable Difference (JND): Difference thresholds low enough to detect minute changes in important stimuli.

  8. Sensation: Thresholds • Signal Detection Theory:predicts how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise) • Assumes that there is no single absolute threshold because the idea of a threshold ignores the decision-making ability of the test subject.

  9. Sensory Adaptation Diminished sensitivity as a consequence of constant stimulation. Put a band aid on your arm and after awhile you don’t sense it.

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