1 detected by instinct or inference rather than by recognized perceptual cues; "the felt presence of an intruder"; "a sensed presence in the room raised goosebumps on her arms"; "a perceived threat" [syn: sensed]
2 detected by means of the senses; "a perceived difference in temperature"
- generally recognized to be true
- The perceived wisdom is that people do not go in large numbers to black-and-white movies anymore
- as seen or understood by an individual
- In product design, where one deals with real, physical objects, there can be both real and perceived affordances, and the two need not be the same.
- past of perceive
In psychology and the cognitive sciences, perception is the process of attaining awareness or understanding of sensory information. It is a task far more complex than was imagined in the 1950s and 1960s, when it was proclaimed that building perceiving machines would take about a decade, but, needless to say, that is still very far from reality. The word perception comes from the Latin perception, percepio, , meaning "receiving, collecting, action of taking possession, apprehension with the mind or senses."
There are two basic theories of perception: Passive Perception (PP) and Active Perception (PA). The passive perception (conceived by René Descartes) is addressed in this article and could be surmised as the following sequence of events: surrounding → input (senses) → processing (brain) → output (re-action). Although still supported by mainstream philosophers, psychologists and neurologists, this theory is nowadays losing momentum. The theory of active perception has emerged from extensive research of sensory illusions, most notably the works of Professor Emeritus Richard L. Gregory. This theory is increasingly gaining experimental support and could be surmised as dynamic relationship between “description” (in the brain) ↔ senses ↔ surrounding.
Perception is one of the oldest fields in psychology. The oldest quantitative law in psychology is the Weber-Fechner law, which quantifies the relationship between the intensity of physical stimuli and their perceptual effects. It was the study of perception that gave rise to the Gestalt school of psychology, with its emphasis on holistic approach.
Perception and realityIn the case of visual perception, some people can actually see the percept shift in their mind's eye. Others who are not picture thinkers, may not necessarily perceive the 'shape-shifting' as their world changes. The 'esemplastic' nature has been shown by experiment: an ambiguous image has multiple interpretations on the perceptual level.
Just as one object can give rise to multiple percepts, so an object may fail to give rise to any percept at all: if the percept has no grounding in a person's experience, the person may literally not perceive it.
Perception alters what humans see, into a diluted version of reality, which ultimately corrupts the way humans perceive the truth. When people view something with a preconceived idea about it, they tend to take those preconceived ideas and see them whether or not they are there. This problem stems from the fact that humans are unable to understand new information, without the inherent bias of their previous knowledge. The extent of a person’s knowledge creates their reality as much as the truth, because the human mind can only contemplate that which it has been exposed to. When objects are viewed without understanding, the mind will try to reach for something that it already recognizes, in order to process what it is viewing. That which most closely relates to the unfamiliar from our past experiences, makes up what we see when we look at things that we don’t comprehend.
This confusing ambiguity of perception is exploited in human technologies such as camouflage, and also in biological mimicry, for example by Peacock butterflies, whose wings bear eye markings that birds respond to as though they were the eyes of a dangerous predator. Perceptual ambiguity is not restricted to vision. For example, recent touch perception research (Robles-De-La-Torre & Hayward 2001) found that kinesthesia-based haptic perception strongly relies on the forces experienced during touch. This makes it possible to produce illusory touch percepts (see also the MIT Technology Review article The Cutting Edge of Haptics).
Cognitive theories of perception assume there is a poverty of stimulus. This (with reference to perception) is the claim that sensations are, by themselves, unable to provide a unique description of the world. Sensations require 'enriching', which is the role of the mental model. A different type of theory is the perceptual ecology approach of James J. Gibson. Gibson rejected the assumption of a poverty of stimulus by rejecting the notion that perception is based in sensations. Instead, he investigated what information is actually presented to the perceptual systems. He (and the psychologists who work within this paradigm) detailed how the world could be specified to a mobile, exploring organism via the lawful projection of information about the world into energy arrays. Specification is a 1:1 mapping of some aspect of the world into a perceptual array; given such a mapping, no enrichment is required and perception is direct.
Perception-in-actionThe ecological understanding of perception advanced from Gibson's early work is perception-in-action, the notion that perception is a requisite property of animate action, without perception action would not be guided and without action perception would be pointless. Animate actions require perceiving and moving together. In a sense, "perception and movement are two sides of the same coin, the coin is action." A mathematical theory of perception-in-action has been devised and investigated in many forms of controlled movement by many different species of organism, General Tau Theory. According to this theory, tau information, or time-to-goal information is the fundamental 'percept' in perception.-
Perception and actionWe gather information about the world and interact with it through our actions. Perceptual information is critical for action. Perceptual deficits may lead to profound deficits in action.
Types of perception
References and further reading
- Flanagan, J.R., Lederman, S.J. Neurobiology: Feeling bumps and holes, News and Views, Nature, 412(6845):389-91 (2001).
- James.J.Gibson, The Senses Considered as Perceptual Systems. Boston 1966.
- James J. Gibson. The Ecological Approach to Visual Perception. Lawrence Erlbaum Associates, 1987. ISBN 0898599598
- Hayward V, Astley OR, Cruz-Hernandez M, Grant D, Robles-De-La-Torre G. Haptic interfaces and devices. Sensor Review 24(1), pp. 16-29 (2004).
- Robles-De-La-Torre G. & Hayward V. Force Can Overcome Object Geometry In the perception of Shape Through Active Touch. Nature 412 (6845):445-8 (2001).
- Robles-De-La-Torre G. The Importance of the Sense of Touch in Virtual and Real Environments. IEEE Multimedia 13(3), Special issue on Haptic User Interfaces for Multimedia Systems, pp. 24-30 (2006).
See alsosisterlinks Perception
perceived in Arabic: إدراك حسي
perceived in Bulgarian: Възприятие
perceived in Czech: Vnímání
perceived in Danish: Perception
perceived in German: Wahrnehmung
perceived in Estonian: Taju
perceived in Spanish: Percepción
perceived in Esperanto: Percepto
perceived in Persian: ادراک
perceived in French: Perception
perceived in Armenian: Ըմբռնում
perceived in Croatian: Percepcija
perceived in Interlingua (International Auxiliary Language Association): Perception
perceived in Italian: Percezione
perceived in Hebrew: תפיסה
perceived in Georgian: აღქმა
perceived in Lithuanian: Suvokimas
perceived in Dutch: Perceptie
perceived in Japanese: 知覚
perceived in Norwegian: Persepsjon
perceived in Polish: Spostrzeganie
perceived in Portuguese: Percepção
perceived in Quechua: Sut'i musyay
perceived in Russian: Восприятие
perceived in Simple English: Perception
perceived in Slovak: Zmyslové vnímanie
perceived in Serbian: Перцепција
perceived in Finnish: Havaitseminen
perceived in Swedish: Perception
perceived in Vietnamese: Tri giác
perceived in Turkish: Algı
perceived in Ukrainian: Пізнання
perceived in Urdu: آگاہی
perceived in Chinese: 知觉