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Figure–ground (perception)

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The Rubin vase illusion, where it is ambiguous which part is the figure and which the ground
Shapes which can be read as a word once the viewer recognises them as being the isolated negative spaces of a word

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".[1]

Gestalt psychology

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Main article: Gestalt psychology

The Gestalt theory was founded in the 20th century in Austria and Germany as a reaction against the associationist and structural schools' atomistic orientation.[2] In 1912, the Gestalt school was formed by Max Wertheimer, Wolfgang Köhler, and Kurt Koffka. The word "gestalt" is a German word translated to English as "pattern" or "configuration."[3] Gestalt concepts can also be referred to as "holism."[4] Gestalt Psychologists were attempting to humanize what was considered a sterile approach. Gestalt psychology establishes that the whole of anything is greater than its parts. The concepts explored by Wertheimer, Köhler, and Koffka in the 20th century established the foundation for the modern study of perception.[5]

"The Gestalt concept is that "not only movement, or process as such, but also the direction and distribution of process is determined dynamically by interaction." Sensory organization is not dependent upon isolated stimuli and local stimulation, but upon the relative properties of stimulation and the dynamical context."[6]

Wertheimer described holism as the "fundamental formula" of Gestalt psychology: "There are wholes, the behavior of which is not determined by that of their individual elements, but where the part-processes are themselves determined by the intrinsic nature of the whole."[7]

Examples

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Man and crane, Mimbres culture pot, c. 1000 -1150 AD

The Rubin vase faces–vase drawing that Danish psychologist Edgar Rubin described [8][9] exemplifies one of the key aspects of figure–ground organization, edge-assignment and its effect on shape perception. In the faces–vase drawing, the perceived shape depends critically on the direction in which the border (edge) between the black and white regions is assigned. If the edges between the black and white regions are assigned inward, then the central white region is seen as a vase shape in front of a black background. No faces are perceived in this case. On the other hand, if the edges are assigned outward, then the two black profile faces are perceived on a white background, and no vase shape is perceived. The human visual system will settle on either of the interpretations of the Rubin vase and alternate between them, a phenomenon known as multistable perception. Functional brain imaging shows that, when people see the Rubin image as a face, there is activity in the temporal lobe, specifically in the face-selective region.[10][11]

An additional example is the "My Wife and My Mother-in-Law" illusion drawing. The image is famous for being reversible. "The viewer may either observe a young girl with her head turned to the right or an old woman with a large nose and protruding chin, depending on one's perspective."[12]

Development

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Figure–ground perception precedes all other visual perceptual skills and is one of the first to develop in a young baby.[13] The development of perceptual organization develops as early as infancy in human beings. In regards to nature versus nurture, concepts such as "lightness" and "proximity" may develop as early as birth, but recognizing "form similarity" may not be functional until activated by particular experiences.[14]

Three- to four-month olds respond to differences in lightness rather than differences in form similarity. It is suggested that scaffolding (the development of new skills over time based on the building of other skills) is responsible for the development of perceptual organization. Environment plays a major role in the development of figure-ground perception.[15]

The development of figure–ground perception begins the day the baby can focus on an object. The faces of caregivers, parents, and familiar objects are the first to be focused on and understood. As babies develop, they learn to distinguish the objects they desire from their surroundings. Sitting up, crawling, and walking present ample opportunity to develop the skill during development. Between the ages of 2–4 the skill can be further cultivated by teaching the child to group or sort items.[16]

Perceptual process

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The perceptual decision in which the brain decides which item is the figure and which are part of the ground in a visual scene can be based on many cues, all of which are of a probabilistic nature. For instance, size assists in distinguishing between the figure and the ground, as smaller regions are often (but not always) figures. Object shape can assist in distinguishing figure from ground because figures tend to be convex. Movement also helps; the figure may be moving against a static environment. Color is also a cue because the background tends to continue as one color behind potentially multiple foreground figures, whose colors may vary. Edge assignment also helps; if the edge belongs to the figure, it defines the shape while the background exists behind the shape. However, it is sometimes difficult to distinguish between the two because the edge that would separate figure from ground is part of neither, equally defining both the figure and the background.[17]

The LOC (lateral occipital cortex) is highly important for figure–ground perception. This region of the visual cortex (located lateral to the fusiform gyrus and extending anteriorly and ventrally) has consistently shown stronger activation in response to objects versus non-objects."[18][19]

Evidently, the process of distinguishing figure from ground (sometimes called figure–ground segmentation) is inherently probabilistic, and the best that the brain can do is to take all relevant cues into account to generate a probabilistic best-guess. In this light, Bayesian figure–ground segmentation models have been proposed to simulate the probabilistic inference by which the brain may distinguish figure from ground.[20][21]

Subjective factors can also influence figure–ground perception. For instance, if a viewer has the intention to perceive one of the two regions as the figure, it will likely alter their ability to analyze the two regions objectively. In addition, if a viewer's gaze is fixated on a particular region, the viewer is more likely to view the fixated region as the figure. Although subjective factors can alter the probability of seeing the figure on one particular side of an edge, they tend not to overpower compositional cues.[22]

Artistic applications

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Figure-ground ambigram tessellation displaying the words Liar / Jail alternatively, using negative space.

Figure–ground organization is used to help artists and designers in composition of a 2D piece. Figure–ground reversal may be used as an intentional visual design technique in which an existing image's foreground and background colors are purposely swapped to create new images.

Non-visual

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Figure–ground perception can be expanded from visual perception to include non-visual concepts such as melody/harmony, subject/background and positive/negative space.[citation needed] The concept of figure and ground fully depends on the observer and not on the item itself.[23]

In the typical sonic scenarios people encounter, auditory figure and ground signals often overlap in time as well as in frequency content. In these situations, auditory objects are established by integrating sound components both over time and frequency.[24] A 2011 study suggests that the auditory system possesses mechanisms that are sensitive to such cross-frequency and cross-time correlations. Results of this study demonstrated significant activations in the intraparietal sulcus (IPS) and the superior temporal sulcus related to bottom-up, stimulus-driven figure–ground decomposition.[25]

In crowded rooms or parties, a person is able to zero in on the conversation they are having with one person (figure) while drowning out the background noise (ground). This can also be referred to as the "cocktail party effect."[26]

Figure–ground segregation in hearing is not automatic; rather, it requires attention[27] and draws on resources that are shared across vision and audition.[28]

Types of figure–ground problems

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Type 2: The ground itself is the figure.

There are three types of figure–ground problems:

  1. The figure and the ground compete.
  2. The figure should be the ground and the ground should be the figure.
  3. The figure and ground create an optical illusion.[29]

See also

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References

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  1. ^ Schacter, Daniel L., Daniel T. Gilbert, and Daniel M. Wegner. "Chapter 4: Sensation and Perception, Vision II: Recognizing What We Perceive." Psychology. ; Second Edition. N.p.: Worth, Incorporated, 2011. 149-50. Print.
  2. ^ "Gestalt psychology | Definition, Founder, Principles, & Examples". Encyclopædia Britannica. Retrieved 2019-12-10.
  3. ^ "gestalt", The Free Dictionary, retrieved 2019-12-10
  4. ^ Wagemans, Johan; Feldman, Jacob; Gepshtein, Sergei; Kimchi, Ruth; Pomerantz, James R.; van der Helm, Peter A.; van Leeuwen, Cees (2012). "A century of Gestalt psychology in visual perception: II. Conceptual and theoretical foundations". Psychological Bulletin. 138 (6): 1218–1252. doi:10.1037/a0029334. ISSN 1939-1455. PMC 3728284. PMID 22845750.
  5. ^ "Information TheoryReprinted with permission from Encyclopædia Britannica, 14th edition, 1968 by Encyclopædia Britannica, Inc.", Claude E. Shannon, IEEE, 2009, doi:10.1109/9780470544242.ch14, ISBN 978-0-470-54424-2
  6. ^ "PsycNET". psycnet.apa.org. Retrieved 2019-12-10.
  7. ^ Wagemans, Johan; Feldman, Jacob; Gepshtein, Sergei; Kimchi, Ruth; Pomerantz, James R.; van der Helm, Peter A.; van Leeuwen, Cees (November 2012). "A century of Gestalt psychology in visual perception: II Conceptual and theoretical foundations". Psychological Bulletin. 138 (6): 1218–1252. doi:10.1037/a0029334. ISSN 0033-2909. PMC 3728284. PMID 22845750.
  8. ^ Rubin, E. (1921) Visuell Wahrgenommene Figuren : Studien in psychologischer Analyse. Kobenhaven: Gyldendalske boghandel.
  9. ^ Rubin, E. (2001). Figure and Ground. In Yantis, S.(Ed.), Visual Perception. (pp. 225-229). Philadelphia, Psychology Press
  10. ^ Schacter, L.D., Gilbert, D.T., Wegner, D.M. (2011). "Psychology (2nd ed.)." New York, NY: Worth Publishers
  11. ^ Hasson, U., Hendler, T., Ben Bashat, D., and Malach, R. (2001). Vase or face? A neural correlate of shape-selective grouping processes in the human brain. J. Cogn. Neurosci. 13, 744–753.
  12. ^ "Figure 5: The young girl-old woman illusion (otherwise known as "My..." ResearchGate. Retrieved 2019-12-10.
  13. ^ cc, 21 Digital Web Solutions. "Early learning: Figure Ground Development in baby's and toddlers". Educanda. Archived from the original on 2019-12-11. Retrieved 2019-12-11.{{cite web}}: CS1 maint: numeric names: authors list (link)
  14. ^ Quinn, Paul C.; Bhatt, Ramesh S. (2018-08-28). "Size and orientation cue figure-ground segregation in infants". Visual Cognition. 26 (7): 518–529. doi:10.1080/13506285.2018.1505794. PMC 6786798. PMID 31602175.
  15. ^ Quinn, Paul C.; Bhatt, Ramesh S. (2018-08-28). "Size and orientation cue figure-ground segregation in infants". Visual Cognition. 26 (7): 518–529. doi:10.1080/13506285.2018.1505794. PMC 6786798. PMID 31602175.
  16. ^ cc, 21 Digital Web Solutions. "Early learning: Figure Ground Development in baby's and toddlers". Educanda. Archived from the original on 2019-12-11. Retrieved 2019-12-11.{{cite web}}: CS1 maint: numeric names: authors list (link)
  17. ^ Schacter, Daniel L.; Daniel T., Gilbert; Daniel M., Wegner (March 2011). Psychology: Second Edition. United States of America: Worth Publishers. pp. 149. ISBN 978-1-4292-3719-2.
  18. ^ Pitts, Michael A.; Martínez, Antígona; Brewer, James B.; Hillyard, Steven A. (April 2011). "Early stages of figure-ground segregation during perception of the face-vase". Journal of Cognitive Neuroscience. 23 (4): 880–895. doi:10.1162/jocn.2010.21438. ISSN 0898-929X. PMC 3071650. PMID 20146604.
  19. ^ Molloy, Katharine; Lavie, Nilli; Chait, Maria (2019-02-27). "Auditory figure-ground segregation is impaired by high visual load". The Journal of Neuroscience. 39 (9): 1699–1708. doi:10.1523/JNEUROSCI.2518-18.2018. ISSN 0270-6474. PMC 6391559. PMID 30541915.
  20. ^ Goldreich, D; Peterson, MA (2012). "A Bayesian observer replicates convexity context effects in figure–ground perception". Seeing and Perceiving. 25 (3–4): 365–95. doi:10.1163/187847612X634445. PMID 22564398.
  21. ^ Barghout, L; Lee, L (2003). "Perceptual information processing system". USPatent Patent Application 10/618,543.
  22. ^ Peterson, Mary; Salvagio, Elizabeth (2010). "Figure-ground perception". Scholarpedia. 5 (4): 4320. Bibcode:2010SchpJ...5.4320P. doi:10.4249/scholarpedia.4320. ISSN 1941-6016.
  23. ^ Carlson, Neil R (2010). Psychology the science of behaviour-figure and ground. US: Pearson Canada. pp. 175. ISBN 978-0-205-64524-4.
  24. ^ Tóth, Brigitta; Kocsis, Zsuzsanna; Háden, Gábor P.; Szerafin, Ágnes; Shinn-Cunningham, Barbara G.; Winkler, István (May 2018). "Corrigendum to "EEG signatures accompanying auditory figure-ground segregation" [NeuroImage (2017) volume 141, pp. 108–119]". NeuroImage. 172: 915. doi:10.1016/j.neuroimage.2017.12.001. ISSN 1053-8119. PMC 8963124. PMID 29233621.
  25. ^ Teki, S.; Chait, M.; Kumar, S.; von Kriegstein, K.; Griffiths, T. D. (2011-01-05). "Brain Bases for Auditory Stimulus-Driven Figure-Ground Segregation". Journal of Neuroscience. 31 (1): 164–171. doi:10.1523/jneurosci.3788-10.2011. ISSN 0270-6474. PMC 3059575. PMID 21209201.
  26. ^ "Tulane University Central Authentication Service 1p01". cas.tulane.edu. Archived from the original on 2019-12-17. Retrieved 2019-12-10.
  27. ^ Molloy, Katharine; Lavie, Nilli; Chait, Maria (2019-02-27). "Auditory figure-ground segregation is impaired by high visual load". The Journal of Neuroscience. 39 (9): 1699–1708. doi:10.1523/JNEUROSCI.2518-18.2018. ISSN 0270-6474. PMC 6391559. PMID 30541915.
  28. ^ Houtkamp, R.; Roelfsema, P. R. (2004-08-01). "Figure-ground and figure-figure segregation in curve tracing". Journal of Vision. 4 (8): 199. doi:10.1167/4.8.199. ISSN 1534-7362.
  29. ^ Lohr L. Creating Graphics for Learning and Performance: Lessons in Visual Literacy Cleveland, OH: Prentice-Hall, 2007.
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  • Figure Ground, a puzzle game plays on the figure–ground illusion.
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