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Psychology - Psychology Perception

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    Study Guide Psychology – Psychology: Perception 1. Organization of Perceptions 1.1 How We Organize What We Perceive Perception is not based only on the individual features of a stimulus (such as color or shape). It is also influenced by how stimuli are arranged or grouped together . Our brains naturally organize information so that the world appears meaningful and orderly , rather than confusing or random. 1.2 Stimulus Characteristics That Affect Perception Several important principles explain how we organize sensory information. These principles describe common ways the brain groups stimuli . 1.3 Closure Closure is the tendency to complete incomplete information . Even when part of a stimulus is missing, the brain fills in the gaps based on past experience. Example: If someone shouts, “Close the ___!” , you automatically understand that the missing word is door , even though it was not spoken. 1.4 Nearness (Proximity) Nearness means that stimuli located close to each other are likely to be grouped together. Example: Stars that appear close together in the sky may be seen as a constellation , while stars that are far apart are not grouped this way.

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    Study Guide 1.5 Similarity Similarity refers to the tendency to group stimuli that look alike . Stimuli that share characteristics such as color, shape, or clothing are perceived as belonging together. Example: People wearing the same band uniforms are seen as a group, while people in everyday clothing are seen as individuals. 1.6 Continuity Continuity is the tendency to perceive patterns as smooth and continuous , rather than broken or disconnected. Example: The dashed line down the center of a highway is seen as one continuous line, not as separate blocks of paint. 1.7 Contiguity Contiguity refers to nearness in time or space . When stimuli occur close together, they are often perceived as being related. Example: A theme song played at the beginning or end of a television program becomes associated with the start or finish of the show. Key Points to Remember • Perception depends on how stimuli are grouped • The brain organizes information automatically • Closure fills in missing information

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    Study Guide • Nearness groups nearby objects • Similarity groups alike objects • Continuity favors smooth patterns • Contiguity links events close in time or space 2. Perceptual Constancy 2.1 What Is Perceptual Constancy? Perceptual constancy refers to the brain’s tendency to perceive objects as stable and unchanging , even when the sensory information reaching our eyes changes. In other words, we see objects as having the same size, shape, and color , even though distance, lighting, or viewing angle may change. 2.2 Types of Perceptual Constancy Size Constancy Size constancy is the ability to recognize that an object stays the same size, even when it appears smaller or larger because of distance. Example: A dog far away may look small, but you still know it is actually a large dog. When it comes closer, you are not surprised by its true size. 2.3 Color Constancy Color constancy allows us to perceive an object’s color as the same under different lighting conditions. Example: A dog may appear brownish from far away or in dim light, but as it approaches, you recognize its true golden color .

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    Study Guide 2.4 Shape Constancy Shape constancy is the ability to recognize an object’s shape even when the angle of view changes. Example: No matter whether you see the dog from the front, side, or at an angle, you still perceive it as having the same dog shape . 2.5 Why Perceptual Constancy Is Important Perceptual constancy helps us: • recognize objects quickly and accurately • understand the world as stable and predictable • function effectively in everyday situations Without perceptual constancy, the world would appear confusing and constantly changing. Key Points to Remember • Perceptual constancy keeps perception stable • Objects may change in appearance, but not in perception • Size, color, and shape constancy work together • Experience helps the brain interpret sensory input 3. Depth and Distance Perception 3.1 Understanding Depth and Distance Depth and distance perception help us see the world in three dimensions and judge how far away objects are. Our brain uses special visual cues to organize space and estimate distance. These cues fall into two main categories: • Monocular cues (use one eye) • Binocular cues (use both eyes)

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    Study Guide 3.2 Monocular Cues (One - Eye Cues) Monocular cues work even when one eye is closed. They help create a three - dimensional understanding of objects and scenes. Important monocular cues include: Size of the Stimulus • Larger images are usually perceived as closer • Smaller images are usually perceived as farther away 3.2.1 Interposition (Overlap) • When one object blocks another, the blocked object is seen as farther away 3.2.2 Shadows • Shadows give clues about distance and depth • Objects that cast clearer shadows often appear closer 3.2.3 Linear Perspective • Parallel lines (such as railroad tracks or roads) appear to converge as they move into the distance • The point where they seem to meet appears far away 3.2.4 Texture Gradient • Objects close to us have clear, detailed textures • As distance increases, textures appear smoother and less detailed Example: Bricks in a nearby wall are easy to see, but far away they blend into a pattern.

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