- 1 Meaning of Perception
- 2 Definition of perception
- 3 Stages of Perception
- 4 Approaches to Perception
- 5 Gestalt principles of perceptual organization
- 6 6. The law of Prägnanz
- 7 Factors Affecting Perception
- 8 References for perception
Meaning of Perception
Perception word originated from Latin– word perceptio, percipio.
Basic meaning of perception is Organization, identification, and interpretation of sensory information in order to represent and understand the environment.
Perception is a process of selecting, organizing & interpreting the sensory information based on previous experiences, other’s
experiences, need or expectation.
Perception is the psychological process responsible for our interpretation of the world.
Definition of perception
Perception is the set of processes by which we recognize, organize, and make sense of the sensations we receive from environmental stimuli (Goodale, 2000a; Pomerantz, 2003).
- Visual perception,
- Auditory perception (the two best studied forms),
- Olfactory perception,
- Haptic (touch) perception, and
- Gustatory (taste) perception.
Stages of Perception
Stage I: Selection- Our brain has limited capacity, thus, it cannot attend to all stimuli. We unconsciously / consciously select
some stimuli and ignore others
Stage II: Organization– Here, stimuli are arranged mentally in a meaningful pattern. It is unconscious process depends upon the Gestalt principles of organisation. It will help you understand how humans naturally organize stimuli to make a meaningful pattern and thus interpretation
Stage III: Interpretation – Here, we assign meaning to the organized stimuli. Interpretation of the stimuli is based on one’s experiences, needs, beliefs, expectations, and other factors. Thus, this stage is subjective in nature and the same stimuli can be interpreted differently by individuals.
Approaches to Perception
- Theoretical Approaches to Perception
- Classic Approach to Perception
- Gestalt Approach of Perception
1. Theoretical Approaches to Perception
Two theoretical approaches to explain the process of perception.
- Top-down processing– Pioneer –J. J. Gibson; Process of perception is direct; Perception is a data driven process i.e.,
stimuli carries sufficient information to be interpreted meaningfully and we don’t need to rely on our experiences.
- Bottom-up processing approach– Pioneer –Richard Gregory; Process of perception is indirect; Perception is an experience driven process i.e., stimuli don’t have sufficient information to be interpreted meaningfully and therefore, we need to rely on our experiences.
2. Classic Approach to Perception
James Gibson (1966) provided us a useful ‘classic approach’ for studying perception. through these
- The distal (far) object – the object in the external world (e.g., a tree).
- Informational medium – reflected light, sound waves, chemical molecules, or tactile information coming from the environment.
- Proximal (near) stimulation – i.e., the cells in your retina absorb the light waves.
- Perceptual object – created in you that reflects the properties of the external world. i.e perception. An image of a tree is created on your retina that reflects the falling tree that is in front of you.
- Perceptual modality = system for a particular sense, such as touch or smell.
|Perceptual Modality||Distal (far) Object||Informational Medium||Proximal (near) Stimulation||Perceptual |
|Vision – Sight||Face of child||Reflected light from face||Photons absorbed in Rod & Cones cells of retina||Face of child|
|Auditory– Sound||Mobile Ring||Sound waves||Sound waves received by Basilar membrane||Mobile Ring|
|Olfactory– Smell||Smell of fish||Molecules released by fish||Molecule received by nasal cavity||Smell of fish|
|Haptic –Touch||Keyboard||Mechanical pressure & vibration released||Stimulation received skin||Keyboard|
|Gustatory -Taste||Ice Cream||Molecules of Ice Cream||Molecule contact with taste buds of tongue||Ice Cream|
Criticism to classic approach
- Researches are Disagree that percepts are the same things as proximal stimuli.
- For Example- Size constancy.-Extend your arm away from your body, and look at the back of your hand. Now, keeping the back of your hand facing you, slowly bring it toward you a few inches, then away from you. Does your hand seem to be changing size as it moves? Probably not, although the size of the hand in the retinal image is most certainly changing.
- Why? perception involve classification and recognition-
- Pattern recognition (recognition of a particular object, event, and so on, as belonging to a class “shrubs” ) of objects, events, and so on.
3. Gestalt Approach of Perception
Gestalt psychology-concerned with how people apprehended whole objects, concepts,or units. Three German psychologists Max Wertheimer, Wolfgang Köhler and Kurt Koffka proposed new principles of perception called as Gestalt principle. The Basic premise is ‘whole is different from the sum of its part’.
How we interpret stimulus arrays as consisting of objects and backgrounds?
- Answer 1 –
- Form perception.- cognitive process of segregation of the whole display –
- Into objects ( figure)
- And the background (ground).
- It is called as The Figure-Ground Effect.
- Answer 2–
- Illusory contours/ subjective contours-
- Gregory (1972) believed that this relatively complex display is subject to a simplifying interpretation the perceiver makes without even being aware of making it.
Gestalt principles of perceptual organization
There are five major principles. They are as follows-
1. The principle of proximity or nearness.-
- We tend to perceive this as a set of rows, rather than as a set of columns.
- This is because the elements within rows are closer than the elements within columns.
- Here, we group together things that are nearer to each other.
2. The principle of similarity. –
- We perceive this display as formed in columns (rather than rows), grouping together those elements that are similar.
3. The principle of continuation
- We group together objects whose contours form a continuous straight or curved line.
- Thus we typically perceive as two intersecting curved lines and not as other logically possible elements.
4. The principle of closure
- When we looked at subjective contours.
- We perceive this display as a rectangle, mentally filling in the gap to see a closed, complete, whole figure.
5. The principle of common fate
- Difficult to illustrate in a static drawing.
- The idea is that elements that move together will be grouped together, as depicted in Figure
6. The law of Prägnanz
- Koffka, 1935
- Gestalt principles are subsumed under a more general law,
- This law states that of all the possible ways of interpreting a display, we will tend to select the organization that yields the simplest and most stable shape or form.
The law of Prägnanz – www.careershodh.com
Factors Affecting Perception
1.Motivation or Need- Stanford (1936) found that hungry participants perceived ambiguous stimuli more as food-related stimuli than non-hungry participants. Changizi and Hall (2001) Showed that your need for thirst could also affect perception.
2.Expectation- Bruner & Minturn (1955) illustrated the role of expectation in our perception. Ambiguous figure of ‘13’ in the context of numbers and in the context of alphabets
3.Emotions- You will perceive that umpire as partial if a fan of a IPL team and the umpire made a call against your favorite team. When your perception task is relevant to emotions, it facilitates the performance (Dodd, Vogt, Turkileri, & Notebaert, 2016)
4.Stimulus Characteristics- Noticed that the horns as danger -why? Because of evolution we attend few stimulus differently .
5.Experiences- if you mistakenly perceive a rope as a snake in the dark, then your previous experience is guiding your perceptual process. and vice versa
6.Culture- Ethnographic studies suggest there are cultural differences in social understanding, interpretation, and response to behavior and emotion.
References for perception
Morgan, C. T., King, R. A., Weisz, J. R. & Schopler, J. (2004). Introduction to Psychology. New Delhi: Tata McGraw-Hill.