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The philosophy of perception is concerned with the nature of perceptual experience and the status of perceptual data, in particular how they relate to beliefs about, or knowledge of, the world. Any explicit account of perception requires a commitment to one of a variety of ontological or metaphysical views. Philosophers distinguish internalist accounts, which assume that perceptions of objects, and knowledge or beliefs about them, are aspects of an individual's mind, and externalist accounts, which state that they constitute real aspects of the world external to the individual. The position of naïve realism—the 'everyday' impression of physical objects constituting what is perceived—is to some extent contradicted by the occurrence of perceptual illusions and hallucinations and the relativity of perceptual experience as well as certain insights in science. Realist conceptions include phenomenalism and direct and indirect realism. Anti-realist conceptions include idealism and skepticism. Recent philosophical work have expanded on the philosophical features of perception by going beyond the single paradigm of vision.
Perception is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment. All perception involves signals that go through the nervous system, which in turn result from physical or chemical stimulation of the sensory system. Vision involves light striking the retina of the eye; smell is mediated by odor molecules; and hearing involves pressure waves.
Within visual perception, an optical illusion is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. Illusions come in a wide variety; their categorization is difficult because the underlying cause is often not clear but a classification proposed by Richard Gregory is useful as an orientation. According to that, there are three main classes: physical, physiological, and cognitive illusions, and in each class there are four kinds: Ambiguities, distortions, paradoxes, and fictions. A classical example for a physical distortion would be the apparent bending of a stick half immerged in water; an example for a physiological paradox is the motion aftereffect. An example for a physiological fiction is an afterimage. Three typical cognitive distortions are the Ponzo, Poggendorff, and Müller-Lyer illusion. Physical illusions are caused by the physical environment, e.g. by the optical properties of water. Physiological illusions arise in the eye or the visual pathway, e.g. from the effects of excessive stimulation of a specific receptor type. Cognitive visual illusions are the result of unconscious inferences and are perhaps those most widely known.
Gestalt psychology, gestaltism, or configurationism is a school of psychology that emerged in the early twentieth century in Austria and Germany as a theory of perception that was a rejection of basic principles of Wilhelm Wundt's and Edward Titchener's elementalist and structuralist psychology.
The term phi phenomenon is used in a narrow sense for an apparent motion that is observed if two nearby optical stimuli are presented in alternation with a relatively high frequency. In contrast to beta movement, seen at lower frequencies, the stimuli themselves do not appear to move. Instead, a diffuse, amorphous shadowlike something seems to jump in front of the stimuli and occlude them temporarily. This shadow seems to have nearly the color of the background. Max Wertheimer first described this form of apparent movement in his habilitation thesis, published 1912, marking the birth of Gestalt psychology.
Max Wertheimer was an Austro-Hungarian psychologist who was one of the three founders of Gestalt psychology, along with Kurt Koffka and Wolfgang Köhler. He is known for his book, Productive Thinking, and for conceiving the phi phenomenon as part of his work in Gestalt psychology.
Wolfgang Köhler was a German psychologist and phenomenologist who, like Max Wertheimer and Kurt Koffka, contributed to the creation of Gestalt psychology.
Gestalt Theoretical Psychotherapy(GTP) is a method of psychotherapy based strictly on Gestalt psychology. Its origins go back to the 1920s when Gestalt psychology founder Max Wertheimer, Kurt Lewin and their colleagues and students started to apply the holistic and systems theoretical Gestalt psychology concepts in the field of psychopathology and clinical psychology. Through holism, "a person's thinking, feeling, actions, perceptions, attitudes and logical operations" are seen as one unity. Many developments in psychotherapy in the following decades drew from these early beginnings, like e.g. group psychoanalysis (S. Foulkes), Gestalt therapy (Laura Perls, Fritz Perls, Goodman, and others), or Katathym-imaginative Psychotherapy (Hanscarl Leuner).
Rudolf Arnheim was a German-born writer, art and film theorist, and perceptual psychologist. He learned Gestalt psychology from studying under Max Wertheimer and Wolfgang Köhler at the University of Berlin and applied it to art.
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Figure–ground organization is a type of perceptual grouping that is a vital necessity for recognizing objects through vision. In Gestalt psychology it is known as identifying a figure from the background. For example, black words on a printed paper are seen as the "figure", and the white sheet as the "background".
A visual language is a system of communication using visual elements. Speech as a means of communication cannot strictly be separated from the whole of human communicative activity which includes the visual and the term 'language' in relation to vision is an extension of its use to describe the perception, comprehension and production of visible signs.
In psychology and cognitive neuroscience, pattern recognition describes a cognitive process that matches information from a stimulus with information retrieved from memory.
Gestalt qualities are concepts found in gestalt psychology which refer to the essential nature of a perceptual experience. An example would be how a melody is perceived, as a whole, rather than merely the sum of its individual notes. A formed Gestalt is an entire, complete structure, with clearly defined contours. The quality “trans – positivity” is manifested in the fact that the image of the whole remains even if all the parts change. Gestalt qualities were introduced by the Austrian philosopher Christian von Ehrenfels in his essay "On Gestalt Qualities," published in 1890. "Ehrenfels qualities" may be another term for the same phenomena. The qualities were based on tests done by flashing lights for certain amounts of time. This discovery later led to the famous Gestalt effect discovered by Max Wertheimer.
The neural correlates of consciousness (NCC) refer to the relationships between mental states and neural states and constitute the minimal set of neuronal events and mechanisms sufficient for a specific conscious percept. Neuroscientists use empirical approaches to discover neural correlates of subjective phenomena; that is, neural changes which necessarily and regularly correlate with a specific experience. The set should be minimal because, under the materialist assumption that the brain is sufficient to give rise to any given conscious experience, the question is which of its components is necessary to produce it.
The principles of grouping are a set of principles in psychology, first proposed by Gestalt psychologists to account for the observation that humans naturally perceive objects as organized patterns and objects, a principle known as Prägnanz. Gestalt psychologists argued that these principles exist because the mind has an innate disposition to perceive patterns in the stimulus based on certain rules. These principles are organized into five categories: Proximity, Similarity, Continuity, Closure, and Connectedness.
The watercolor illusion, also referred to as the water-color effect, is an optical illusion in which a white area takes on a pale tint of a thin, bright, intensely colored polygon surrounding it if the coloured polygon is itself surrounded by a thin, darker border. The inner and outer borders of watercolor illusion objects often are of complementary colours. The watercolor illusion is best when the inner and outer contours have chromaticities in opposite directions in color space. The most common complementary pair is orange and purple. The watercolor illusion is dependent on the combination of luminance and color contrast of the contour lines in order to have the color spreading effect occur.
Edith Hirsch Luchins was a Polish-American mathematician. Her work focused on applying mathematical principles to problems in the philosophy of science and psychology, most notably in the field of Gestalt psychology. The Luchins and Luchins' Water Jar Experiment is named after her and psychologist Abraham S. Luchins.
Hans Wallach was a German-American experimental psychologist whose research focused on perception and learning. Although he was trained in the Gestalt psychology tradition, much of his later work explored the adaptability of perceptual systems based on the perceiver's experience, whereas most Gestalt theorists emphasized inherent qualities of stimuli and downplayed the role of experience. Wallach's studies of achromatic surface color laid the groundwork for subsequent theories of lightness constancy, and his work on sound localization elucidated the perceptual processing that underlies stereophonic sound. He was a member of the National Academy of Sciences, a Guggenheim Fellow, and recipient of the Howard Crosby Warren Medal of the Society of Experimental Psychologists.
Kurt Koffka was a German psychologist and professor. He was born and educated in Berlin, Germany; he died in Northampton, Massachusetts from coronary thrombosis. He was influenced by his maternal uncle, a biologist, to pursue science. He had many interests including visual perception, brain damage, sound localization, developmental psychology, and experimental psychology. He worked alongside Max Wertheimer and Wolfgang Köhler to develop Gestalt psychology. Koffka had several publications including "The Growth of the Mind: An Introduction to Child Psychology" (1924) and "The Principles of Gestalt Psychology" (1935) which elaborated on his research.
References
- ↑ Wertheimer, M. 2010. Isomorphism. Corsini Encyclopedia of Psychology. 1–2.
- ↑ Kohler, W. (1920/1955). Die physischen Gestalten in Ruhe und im stationaren Zustand. Abridged trans. in W.D. Ellis (Ed.), A source book of gestalt psychology. (pp. 71-88). New York: The Humanities Press. (Original work published in 1920).
- ↑ Lehar, S. (1999). Gestalt Isomorphism and the Quantification of Spatial Perception. Gestalt Theory, 21(2). Retrieved November 1, 2012, from http://cns-alumni.bu.edu/~slehar/webstuff/isomorph/isomorph.html Archived 2013-06-22 at the Wayback Machine
- ↑ Luchins, A. S., & Luchins, E. H. (1999). Isomorphism in Gestalt Theory: Comparison of Wertheimer's and Köhler's Concepts. Gestalt Theory, 21(3). Retrieved November 2, 2012, from http://gestalttheory.net/archive/luch_iso1.html#A Archived 2012-10-05 at the Wayback Machine
- ↑ Boeree, C. G. (n.d.). Gestalt Psychology. My Webspace files. Retrieved November 4, 2012, from http://webspace.ship.edu/cgboer/gestalt.html
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