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Sensation Overview

Sensation Overview. Aaron Houchin. Essential Questions. What are the 3 different laws that psychology uses in regards to the senses? What’s the difference between Absolute Threshold and the Difference Threshold?. Vocabulary.

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Sensation Overview

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  1. Sensation Overview Aaron Houchin

  2. Essential Questions • What are the 3 different laws that psychology uses in regards to the senses? • What’s the difference between Absolute Threshold and the Difference Threshold?

  3. Vocabulary • Transduction: The process used by the nervous system to convert stimulus received by receptors into electrochemical energy. • Sensory Adaptation: Continued exposure to the same stimulus makes the receptor less sensitive to the stimulus. • Subliminal Stimuli/Perception: Stimulus that are below the threshold of consciousness.

  4. Vocabulary #2 • Absolute Threshold: The least amount of stimulus needed for a receptor to activate. • Difference Threshold: The smallest difference between two stimuli that’s noticeable 50% of the time. (Same thing as Just Noticeable Difference) • Signal Detection Theory: The theory that states that the stimulus threshold changes based on background noise.

  5. Weber’s Law • Weber’s Law: K= ΔI/I The observation that the amount of stimulus increase or decrease required to notice a change, divided by the original stimulation, is a constant • What is really means is this- When you’re listening to music very loudly, you’ll have to decrease the volume more before you notice a difference than if it were really quiet and you turned it up.

  6. Fechner’s Law + Steven’s Power Law • Fechner’s Law: Explains the relationship between the strength of the actual stimulus, and the perceived stimulus. As the physical stimulus increases, the perceived magnitude progressively gets bigger. • A good example of this is one of Weber’s experiments. Weber blindfolded a person and handed them a weight, gradually increasing it by different amounts. If the original weight was 1 lb, adding a few grams won’t be noticed, but if you were to add half of the original weight to it, it’d be noticed. • The Steven’s Power Law is just an improvement on Fechner’s Law, and allows it to cover more perceptions.

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