Stimulus intensity low high a detection finding the

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Stimulus Intensity low high A. Detection: Finding the absolute threshold Probability of detection is gradual. “Absolute” threshold is point of 50% detection A. Detection: Finding the absolute threshold Vision: Candle flame at 30 miles. Hearing: Tick of a watch at 20 ft. Taste: 1 tsp sugar in 2 gal of water. Smell: 1 drop of perfume diffused in 6 rooms. Touch: Wing of a fly falling on cheek from 1 cm. Summary A. Perception is a process… What we see is constructed by many factors besides what is in the physical environment. B. Mechanisms of perception: Perception depends on the receptors of sensation and many non-sensory factors such as context and experience. C. Measuring perception There are rigorous ways to measure our perceptual experiences. These reveal that there are orderly relationships between stimuli from the external world and our personal experiences, but that they are not always 1:1. Absolute threshold is defined by a 50% probability of detection Next lecture: more on measuring perception
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  • Winter '07
  • D.Whitney
  • C. Measuring perception

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