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File:Sinestezija primjer.jpg
Example of associations between graphemes and colors that are described more accurately as ideasthesia than as synesthesia

Ideasthesia (alternative spelling ideaesthesia) is defined as a phenomenon in which activations of concepts (inducers) evoke perception-like experiences (concurrents). The name comes from Greek ἰδέα (idéa) and αἴσθησις (aísthēsis), meaning "sensing concepts" or "sensing ideas". The main reason for introducing the notion of ideasthesia was the empirical evidence indicating that the related term synesthesia (i.e. union of senses) suggests incorrect explanation of a set of phenomena traditionally covered by this heading. Syn-aesthesis denoting "co-perceiving", implies the association of two sensory elements with little connection to the cognitive level. However, according to others,[1][2][3][4][5] most phenomena that have inadvertently been linked to synesthesia in fact are induced by the semantic representations i.e., the meaning of the stimulus rather than by its sensory properties, as would be implied by the term synesthesia. In other words, while synesthesia presumes that both inducer and concurrent are of sensory nature, ideasthesia presumes that only the concurrent is of sensory nature while inducer is semantic. Research on ideasthesia bears important implications for solving the mystery of human conscious experience, which according to ideasthesia, is grounded in how we activate concepts.[6]

Examples and evidence

A common example of ideasthesia is the association between graphemes and colors, usually referred to as grapheme-color synesthesia. Here, letters of the alphabet are associated with vivid experiences of color. Studies have indicated that the perceived color is context-dependent and is determined by the extracted meaning of a stimulus. For example, an ambiguous stimulus '5' that can be interpreted either as 'S' or '5' will have the color associated with 'S' or with '5', depending on the context in which it is presented. If presented among numbers, it will be interpreted as '5' and will associate the respective color. If presented among letters, it will be interpreted as 'S' and will associate the respective synesthetic color.[1]

Evidence for grapheme-color ideasthesia comes also from the finding that colors can be flexibly associated to graphemes, as new meanings become assigned to those graphemes. In one study synesthetes were presented with Glagolitic letters that they have never seen before, and the meaning was acquired through a short writing exercise. The Glagolitic graphemes inherited the colors of the corresponding Latin graphemes as soon as the Glagolitic graphemes acquired the new meaning.[2]

In another study, synesthetes were prompted to form novel synesthetic associations to graphemes never seen before. Synesthetes created those associations within minutes or seconds - which was time too short to account for creation of new physical connections between color representation and grapheme representation areas in the brain,[7] pointing again towards ideasthesia.

For lexical-gustatory synesthesia evidence also points towards ideasthesia: In lexical-gustatory synesthesia, verbalisation of the stimulus is not necessary for the experience of concurrents. Instead, it is sufficient to activate the concept.[3]

Another case of ideasthesia is swimming-style synesthesia in which each swimming style is associated with a vivid experience of a color.[4][8] These synesthetes (ideasthetes) do not need to perform the actual movements of a corresponding swimming style. To activate the concurrent experiences, it is sufficient to activate the concept of a swimming style (e.g., by presenting a photograph of a swimmer or simply talking about swimming).

It has been argued that grapheme-color synesthesia for geminate consonants provides also evidence for ideasthesia.[9]

Ideasthesia in normal perception

Which one would be called Bouba and which Kiki? Responses are highly consistent among people. This is an example of ideasthesia as the conceptualization of the stimulus plays an important role.

Recently, it has been suggested that the Bouba/Kiki phenomenon is a case of ideasthesia.[10] Most people will agree that the star-shaped object on the left is named Kiki and the round one on the right Bouba.[11][12] It has been assumed that these associations come from direct connections between visual and auditory cortices.[12] For example, according to that hypothesis, representations of sharp inflections in the star-shaped object would be physically connected to the representations of sharp inflection in the sound of Kiki. However, Gomez et al.[10][13] have shown that Kiki/Bouba associations are much richer as either word and either image is associated semantically to a number of concepts such as white or black color, feminine vs. masculine, cold vs. hot, and others. These sound-shape associations seem to be related through a large overlap between semantic networks of Kiki and star-shape on one hand, and Bouba and round-shape on the other hand. For example, both Kiki and star-shape are clever, small, thin and nervous. This indicates that behind Kiki-Bouba effect lies a rich semantic network. In other words, our sensory experience is largely determined by the meaning that we assign to stimuli. Food description and wine tasting is another domain in which ideasthetic association between flavor and other modalities such as shape may play an important role[14]

Implications for development of synesthesia

The concept of ideasthesia bears implications for understanding how synesthesia develops in children. Synesthetic children may associate concrete sensory-like experiences primarily to the abstract concepts that they have otherwise difficulties dealing with.[6] Synesthesia may thus be used as a cognitive tool to cope with the abstractness of the learning materials imposed by the educational system (referred to also as a semantic vacuum). This hypothesis explains why the most common inducers in synesthesia are graphemes and time units — both relating to the first truly abstract ideas that a child needs to master.[citation needed]

See Also


  1. 1.0 1.1 Dixon, M.J., Smilek, D., Duffy, P.L., Zanna, P. M., Merikle, P. M. (2006) The Role of Meaning in Grapheme-Colour Synaesthesia, Cortex 42: 243-252.
  2. 2.0 2.1 Mroczko A., T. Metzinger, W. Singer, D. Nikolić (2009) Immediate transfer of synesthesia to a novel inducer. Journal of Vision, 9: 2521-2528.
  3. 3.0 3.1 Simner, J.; Ward, J. (2006) The taste of words on the tip of the tongue, Nature 444: 438.
  4. 4.0 4.1 Nikolić, D., U.M. Jürgens, N. Rothen, B. Meier, A. Mroczko (2011) Swimming-style synesthesia. Cortex, 47(7):874-879.
  5. Chiou, R., Rich N.A. (2014) The role of conceptual knowledge in understanding synaesthesia: Evaluating contemporary findings from a ‘hub-and-spoke’perspective. Frontiers in Psychology, 5: 105.
  6. 6.0 6.1 Mroczko-Wąsowicz, A., Nikolić D. (2014) Semantic mechanisms may be responsible for developing synesthesia. Frontiers in Human Neuroscience 8:509. doi: 10.3389/fnhum.2014.00509
  7. Jürgens U.M., Nikolić D. (2012) Ideaesthesia: Conceptual processes assign similar colours to similar shapes. Translational Neuroscience, 3(1): 22-27.
  8. Mroczko-Wąsowicz, Aleksandra, and Markus Werning. Synesthesia, sensory-motor contingency, and semantic emulation: how swimming style-color synesthesia challenges the traditional view of synesthesia. Frontiers in psychology 3 (2012).
  9. Weaver, D.F., Hawco C.L.A. (2015) Geminate consonant grapheme-colour synaesthesia (ideaesthesia). BMC Neurology, 15:112.
  10. 10.0 10.1 Gómez Milán, E., Iborra, O., de Córdoba, M.J., Juárez-Ramos V., Rodríguez Artacho, M.A., Rubio, J.L. (2013) The Kiki-Bouba effect: A case of personification and ideaesthesia. The Journal of Consciousness Studies. 20(1-2): pp. 84-102.
  11. Köhler, W (1929). Gestalt Psychology. New York: Liveright.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. 12.0 12.1 Ramachandran, VS & Hubbard, EM (2001) Synaesthesia: A window into perception, thought and language. Journal of Consciousness Studies 8(12): 3–34.
  13. Milán, Emilio Gómez, Oscar Iborra Martínez, and María José de Córdoba Serrano. El Universo Kiki-Bouba: Ideaestesia, Empatía y Neuromárketing. Fundación Internacional artecittà, 2014.
  14. Spence, Charles, and Ophelia Deroy. On the shapes of flavours: A review of four hypotheses. Theoria et Historia Scientiarum 10 (2014): 207-238.

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