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Perception- Introduction, types, and theories, Lecture notes of Cognitive Psychology

These are the notes by the teacher and some of it is stacked up by myself to understand the topic more effectively.

Typology: Lecture notes

2020/2021

Available from 09/23/2022

bhumika-prajapati
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Perception
- Perception is the process through which the information from outside
environment is selected, received, organised and interpreted to make it
meaningful to you. This input of meaningful information results in
decisions and actions.
Characteristics
- Perception is a selective process: We do not perceive each and everything in
the world or around us. We attend to only a part of the stimuli around us. We
select only a limited range of stimuli to which we attend. Attention is a basic
process in perception. It makes our perception selective in nature. What we
select would depend upon our needs, interests, and motives or on the nature
of stimuli to which we are exposed.
- Perception requires sensation: Perception is intimately related to sensation.
In order for perception to occur, we must first experience some sensation.
- Perception involves organization : Perception is not merely a collection of
present sensations and memory traces of past experiences. It is a meaningful
and integrated organization of past and present knowledge.
- Perception involves past experience: Perception involves past experience
also. The present information can be meaningfully understood only when we
integrate our past and interpret it in terms of present or future consequences.
- Change is the basis of perception : Perception is always a response to some
change or difference in the environment. If the world were uniformly the same
we would experience no perception. E.g., change in the weather, style of dress,
food, etc. is easily perceived. Any change in the normal routine is perceived
quickly. - Perception is objective as well as subjective : We all perceive certain
things as the same e.g., table, chair, etc. are perceived by every one of us in a
more or less similar manner. This is objective perception. In many cases our
perception is considerably influenced by our thoughts, motives, interests, etc.
Such perception is subjective in nature, e.g., an ambiguous event may be
perceived differently by different individuals.
- Perception has affective aspect : Our perception often induces emotions in
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Perception

  • Perception is the process through which the information from outside environment is selected, received, organised and interpreted to make it meaningful to you. This input of meaningful information results in decisions and actions. Characteristics – - Perception is a selective process: We do not perceive each and everything in the world or around us. We attend to only a part of the stimuli around us. We select only a limited range of stimuli to which we attend. Attention is a basic process in perception. It makes our perception selective in nature. What we select would depend upon our needs, interests, and motives or on the nature of stimuli to which we are exposed. - Perception requires sensation: Perception is intimately related to sensation. In order for perception to occur, we must first experience some sensation. - Perception involves organization : Perception is not merely a collection of present sensations and memory traces of past experiences. It is a meaningful and integrated organization of past and present knowledge.
  • Perception involves past experience: Perception involves past experience also. The present information can be meaningfully understood only when we integrate our past and interpret it in terms of present or future consequences.
  • Change is the basis of perception : Perception is always a response to some change or difference in the environment. If the world were uniformly the same we would experience no perception. E.g., change in the weather, style of dress, food, etc. is easily perceived. Any change in the normal routine is perceived quickly. - Perception is objective as well as subjective : We all perceive certain things as the same e.g., table, chair, etc. are perceived by every one of us in a more or less similar manner. This is objective perception. In many cases our perception is considerably influenced by our thoughts, motives, interests, etc. Such perception is subjective in nature, e.g., an ambiguous event may be perceived differently by different individuals.
  • Perception has affective aspect : Our perception often induces emotions in

us. When we perceive an old friend we feel happy. When we perceive a snake, we are afraid. Thus, perception produces feelings and emotions. Determinants – Determinants of perception are basically divided into two categories:

  1. Structural
  2. Behavioral ● Structural determinants refer to those qualities that stem from the stimulus itself such as its size, shape, color, amount, intensity, continuity, distance, depth etc. ● Behavioral determinants refer to attention, past experiences, needs, values, learning of a person ● Besides these two basic categories another important determinant of perception is stimulus organization, that is, object arrangement. Perceptual organization is governed by the Gestalt laws of organization: Proximity, Similarity, Closure and Continuity. Factors affecting – ● Internal - - Mind set - Interest - Motives and Needs - Past experience - Cognitive styles ● External – - Socio-economic status - Nature and Nurture - Situation - Culture
  1. Law of Proximity-It means nearness, the object which are nearer to each other can be perceived meaningfully by grouping them.
  2. Law of Closure- When a stimulus is presented with gaps the human tendency is to perceive that figure as complete one by filling the gaps psychologically.
  3. Law of Similarity- Stimuli need not be nearer to each other for perception if there is similarity in these objects, they are grouped together and perceived even if they are away.
  4. Law of Continuity \ Movement- Any stimulus which extends in the same direction or shape will be perceived as a whole.
  5. Law of Symmetry - Objects which are having symmetrical shapes are perceived as groups. ● Perceptual Constancy- The term is given by Sartain, North, Strange and Chapman. According to them Perceptual Constancy is a tendency of a stimulus situation to be perceived in approximately the same way under wearing circumstances.
  6. Shape Constancy- The tendency to perceive a physical objects as having a constant shape even when the image it casts on the retina changes.
  7. Size Constancy-The tendency to perceive a physical object as having a constant size even when the size of the image it casts on the retina changes.
  8. Color Constancy- The experience of color depends on the surrounding context color will remain roughly constant as the lighting and wavelength shift we perceive the color of a surface to be same even though there are changes in shape.
  9. Brightness Constancy- The light that a surface seems to reflect gives a perception of the lightness of a subject. The perceived brightness of an object remains the same despite the changing of delamination. ● Illusion- Instance in which perception yields false interpretations of physical reality is known as Illusion.

● Illusions due to distortion of physical conditions includes mirages – In which you perceive things which aren’t really present. ● Illusions due to cognitive distortion is knowns as illusion of size and illusion of shape and area. ● Pattern recognition - Pattern recognition occurs when information from the environment is received and entered into short-term memory, causing automatic activation of a specific content of long-term memory. An early example of this is learning the alphabet in order. When a carer repeats ‘A, B, C’ multiple times to a child, utilizing the pattern recognition, the child says ‘C’ after he/she hears ‘A, B’ in order. Recognizing patterns allows us to predict and expect what is coming. The process of pattern recognition involves matching the information received with the information already stored in the brain. Making the connection between memories and information perceived is a step of pattern recognition called identification. Pattern recognition requires repetition of experience. Semantic memory, which is used implicitly and subconsciously is the main type of memory involved with recognition ● Types of pattern recognition - Top-down processing : Top-down processing refers to the use of background information in pattern recognition. It always begins with a person’s previous knowledge, and makes predictions due to this already acquired knowledge. ● Bottom-up processing : Bottom-up processing is also known as data- driven processing, because it originates with the stimulation of the sensory receptors. Depth perception is the visual ability to perceive the world in three dimensions (3D) and the distance of an object. Depth perception is the human eye’s ability to see in three dimensions and judge the distance of an object. It takes both eyes working in sync to look at an object and develop an informed idea about it, like its size or how far away it is. Your two eyes look at the object from different angles and that information is processed in your brain to form a single image.

  1. Binocular cues - Binocular cues – depth information based on the coordinated efforts of both the eyes; there are two dimensions of binocular cues :-  Convergence : in order to see close objects, our eyes turn inward, toward one another ; the greater this movement, the closer such objects appear to be.  Retinal disparity: our two eyes observe objects from slightly different position in space; the difference between these two images is interpreted by our brain to provide anther cue to depth ● Movement perception , process through which humans and other animals orient themselves to their own or others’ physical movements. Most animals, including humans, move in search of food that itself often moves; they move to avoid predators and to mate. Animals must perceive their own movements to balance themselves and to move effectively; without such perceptual functions the chances for survival would be sharply reduced; these can be divided in two aspects :-
  2. Real movement
  3. Apparent movement  Culture and perception are inextricably linked, because it is through people’s own culture that they view and perceive themselves and others in the world, as well as events and social and political happenings. Culture includes people’s background and upbringing as well as their religious and political beliefs. It also is based on factors such as a person’s gender, race, ethnicity and nationality. Although people can easily develop an appreciation for and understanding of diverse cultures, their perception of people — as well as their perception of historical and social events — and their actions and beliefs likely will be heavily colored or influenced by their own culture.