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Understanding Sensation and Perception: Thresholds and Blindness

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This text explores the concepts of sensation and perception in psychology. Sensation refers to the experience of sensory stimulation, involving our senses of sight, hearing, smell, taste, touch, and pain. Perception follows as the process of interpreting those sensory inputs into meaningful patterns. Notable topics include absolute thresholds, which are the minimal levels of stimulation detectable by our senses, and perceptual consistency. The concept of unintentional blindness highlights how we may overlook visible stimuli, exemplified by the famous "invisible gorilla" experiment.

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Understanding Sensation and Perception: Thresholds and Blindness

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  1. SENSATION & PERCEPTION

  2. SENSATION • Sensation— Experience of sensory stimulation. That is, the basic experience of stimulation of the body’s senses: sight, hearing, smell, taste, balance, touch & pain.

  3. PERCEPTION • Perception— Process of creating meaningful patterns from raw sensory information.

  4. ABSOLUTE THRESHOLDS… • Absolute Thresholds—the least amount of energy that can be detected as stimulation 50 % of the time. • Simply put: is the smallest amount of a stimulus that a person can detect • Taste—1 gram of table salt in 500 liters of water • Smell—One drop of perfume diffused throughout a three-room apartment • Touch—The wing of a bee falling on your cheek from a height of 2 centimeters • Hearing—The tick of a watch from 20 feet away in quiet conditions • Vision— A candle flame seen from 30 miles on a clear, dark night.

  5. PERCEPTUAL CONSISTENCY… • Perceptual Consistency— The percentage of times that repeated raw sensory information is processed just as it was before.

  6. How Perceptive Are YOU? • Count the Basketball Passes… • http://www.theinvisiblegorilla.com/videos.html

  7. UNINTENTIONAL BLINDNESS… • Unintentional Blindness:occurs when a person fails to notice something that is in plain sight. This stimulus is usually unexpected but fully visible. Example: The gorilla experiment

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