Tangible symbols are a type of

augmentative and alternative communication Augmentative and alternative communication (AAC) encompasses the communication methods used to supplement or replace speech or writing for those with impairments in the production or comprehension of spoken or written language. AAC is used by t ...

(AAC) that uses objects or pictures that share a perceptual relationship with the items they represent as

symbols A symbol is a mark, sign, or word that indicates, signifies, or is understood as representing an idea, object, or relationship. Symbols allow people to go beyond what is known or seen by creating linkages between otherwise very different con ...

. A tangible symbol's relation to the item it represents is perceptually obvious and concrete – the visual or tactile properties of the symbol resemble the intended item. Tangible Symbols can easily be manipulated and are most strongly associated with the sense of touch. These symbols can be used by individuals who are not able to communicate using speech or other abstract symbol systems, such as

sign language Sign languages (also known as signed languages) are languages that use the visual-manual modality to convey meaning, instead of spoken words. Sign languages are expressed through manual articulation in combination with non-manual markers. Sign l ...

. However, for those who have the ability to communicate using speech, learning to use tangible symbols does not hinder further developing acquisition of natural

speech Speech is a human vocal communication using language. Each language uses phonetic combinations of vowel and consonant sounds that form the sound of its words (that is, all English words sound different from all French words, even if they are ...

and/or

language development Language development in humans is a process starting early in life. Infants start without knowing a language, yet by 10 months, babies can distinguish speech sounds and engage in babbling. Some research has shown that the earliest learning begin ...

, and may even facilitate it.

Definition

The term ''tangible symbols'' was first developed by Charity Rowland and Philip Schweigert,Rowland, C. & Schweigert, P. (2000). Tangible symbols, tangible outcomes. Augmentative and Alternative Communication, 16 (2), 61–78Rowland, C., & Schweigert, P. (1989). Tangible symbols: Symbolic communication for individuals with multisensory impairments. Augmentative and Alternative Communication, 5(4), 226–234. and refers to two-dimensional pictures or three-dimensional objects used as symbols to convey meaning. The items are termed "tangible" because they are concrete items that can be manipulated by the user and communication partner. Symbols can be used individually or combined with other symbols in order to create new messages. Tangible symbols are used as a means of communication for individuals who are unable to understand or communicate using abstract systems, such as speech or

.Beukelman & Mirenda (2005), p. 51 Properties of tangible symbols include permanency, capacity to be manipulated by both the user and the communication partner, and an obvious relationship between the symbol and the referent. They can represent items, people, activities and/or events, and look or feel similar to what they refer to. For example, a cup can be used as three-dimensional tangible symbol to represent the action: "drink". A photograph of a cup can be used as a two-dimensional tangible symbol to also represent the action : "drink". Two- and three-dimensional symbols are used to fit the cognitive and sensory abilities of the individual, as well as the individual's unique experiences. Rowland and Schweigert use the term tangible symbols to refer to conceptually tangible items like two-dimensional pictures or three-dimensional objects. However, other authors, such as Beukelman and Mirenda, use the term to exclusively describe three-dimensional physical objects that display concrete properties such as shape or texture. According to Rowland and Schweigert, "for some individuals, the use of tangible symbols may be used to bridge the gap between gestural communication and the use of formal language systems. For others, tangible symbols may represent an ultimate level of communicative competence."

History

Historically, objects and pictures have frequently been used as communication devices.Park, K. (1995) Using objects of reference: a review of the literature. European Journal of Special Needs Education, 10(1), 40–46.Park, K. (1997). How do objects become objects of reference? A review of the literature on objects of reference and a proposed model for the use of objects in communication. British Journal of Special Education, 24(3), 108–114. Many authors have also used picture symbols, such as line drawings and photographs to develop language in individuals with little or no speech and/or

cognitive disabilities There are a variety of disabilities affecting cognitive ability. This is a broad concept encompassing various intellectual or cognitive deficits, including intellectual disability (formerly called ''mental retardation''), deficits too mild to ...

. Tangible symbols emerged from Van Dijk’s work in the 1960s using objects as symbols to develop language in deaf-blind children. In turn, Van Dijk’s work was based on the concept "symbol formation" developed by Werner and Kaplan (1963), who theorized that "symbol formation" referred to the process of developing language by creating symbols in our minds.

Types of tangible symbols

Rowland and Schweigert propose that tangible symbols can be divided into hierarchical categories, ranging from most concrete to most abstract symbols: *Identical objects are real items that are equal to their referent and are the most concrete type of tangible symbol. An example includes using a toothbrush to represent "brush your teeth". Beukelman and Mirenda includes in this category miniature objects: items that are smaller than what they symbolize, such as having a small toy toilet indicate "toilet".Beukelman & Mirenda (2005), p. 52 *Partial/associated objects refers to a portion of the object they represent, and therefore are less concrete than identical objects. For example, a shoelace would symbolize "shoes". *Symbols with one or two shared features have a resemblance to their referent, like using a mould of a loaf of bread for "bread". This category is sometimes included in the partial/associated objects category. *Artificial symbols are abstract symbols that do not have a direct resemblance to their referent, such as having a 3D shape (i.e. an apple) that is attached to a cafe door be used as the symbol for "cafe". Beukelman and Mirenda include textured symbols in this category. An example of a textured symbol is using a piece of spandex material to denote "bathing suit". *Three-dimensional symbols may be identical objects, parts of objects, or associated objects. A three-dimensional symbol will share similar features of the focused object, creating a meaningful symbol. *Two-dimensional pictures, such as photographs and line drawings, are the most abstract type of tangible symbols. They are commonly used for both expressive and receptive communication, whereas the three-dimensional symbols are often used for receptive only communication (i.e. to cue the individual for upcoming events)

The type of tangible symbol used is chosen based on the

cognitive Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of intellectual functions and processes such as: perception, attention, though ...

and sensory abilities of the learner/user. The meaning behind each symbol is not universal, but by using a symbol the individual is familiar with, a meaningful symbol is created. Tangible symbols should be constructed by meaningful and motivating symbols that will provide the individual with the most opportunities to practice using the new system.

Users of tangible symbols

Individuals who can benefit from using tangible symbols include those who may lack the skills to communicate using verbal speech or other various communication systems such as sign language. Users of tangible symbols may include individuals with

(including developmental delay and intellectual disability), sensory and/or visual impairments (blindness and/or deafblindness),

developmental disabilities Developmental disability is a diverse group of chronic conditions, comprising mental or physical impairments that arise before adulthood. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, espe ...

(such as autism spectrum disorder), and orthopedic impairments. Rowland and Schweigert claim that tangible symbols do not require the use of high demands on the learner’s cognitive abilities,

memory Memory is the faculty of the mind by which data or information is encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If past events could not be remembered, ...

visual perception Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflec ...

, and motor abilities because they are: * Iconic and concrete: they have a clear connection what they refer to. *Permanent: the user does not need to recall the object, but simply be able to recognize them. *Manipulable: can be picked up and used by the learner and who s/he is communicating with. *Tactually discriminable: can be identified by touch. *May be indicated through a simple motor response: such as eye gazing, touching, or pointing. Furthermore, simple behavioral responses can be used with tangible items. For example, learners that are unable to speak can simply point, touch, pick up, or look (in cases of severe motoric impairment) at the object to answer a question or make a request. Finally, three-dimensional objects can be distinguished from one another using touch, and therefore they are suitable for people with visual impairments or blindness. A study by Rowland and Schweigert found individuals who were already able to communicate using gestures or vocalizations more readily learned to use tangible symbols than those who did not have intentional pre-symbolic communication skills.

Application of tangible symbols

Presentation format depends on the users visual scanning and motoric ability. The tangible symbols can placed in front of the user within reach, placed on a board for visual scanning, or placed in a book for access. Typically, tangible symbols are custom made and tailored to the individual child. If pre-made sets are used, it is assumed that the symbols are familiar and motivating for the user. It is important to utilize frequently occurring and highly motivating symbols in order to optimize opportunities for use. Tangible symbol system offers a manual and DVD as well as an online course. For more information on tangible symbol system instructional strategies, please reference: http://designtolearn.com/products/tangible_symbol_systems

Universal tangible symbol system

In 2009, Ellen Trief, Susan M. Bruce, Paul W. Cascella, and Sarah Ivy created a Universal Tangible Symbol System. They began by developing a survey to determine which tangible symbols were already in use, new activities and concepts for which tangible systems are needed, and participant preferences for tangible symbols from a pilot study. Participants included teachers and speech-language pathologists from four New York City schools. Following the survey, an advisory board consisting of directors of the New York City schools, speech-language pathologists, the designer and manufacturer of the symbols, a representative from the Perkins School for the Blind, college professors, and a graduate research assistant reviewed and discussed the results. This resulted in the establishment of the 55 universal tangible symbols seen in the chart below. However, this universal tangible symbol system should not replace a system already established for an individual.Trief, E., Bruce, S.M., Cascella, P.W., & Ivy S. (2009). The development of a universal tangible symbol system. Journal of visual impairment & blindness. July 2009. 425–431.

Notes

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References

*Beukelman, D.R. & Mirenda, P. (2005). Augmentative and Alternative Communication: Supporting Children and Adults with Complex Communication Needs (3rd edition). Baltimore: Brookes. *Rowland, C., & Schweigert, P. (1996). Tangible Symbol Systems (DVD). Portland, OR: Oregon Health & Science University. *Rowland, C., & Schweigert, P. (2000). Tangible Symbol Systems (2nd Ed.). Portland, OR: Oregon Health & Science University. *Stephenson, J., & Linfoot, K. (1996). Pictures as communication symbols for students with severe intellectual disability. Augmentative and Alternative Communication, 12 (4), 244–256. *Trief, E., Cascella, P.W., & Bruce, S.M. (2013). A field study of a standardized tangible symbol system for learners who are visually impaired and have multiple disabilities. "Journal of visual impairment & blindness.' May–June 2013, 180–191. *Trief, E., Bruce, S.M., Cascella, P.W., & Ivy S. (2009). The development of a universal tangible symbol system. "Journal of visual impairment & blindness." July 2009. 425–431. *Rowland, C., & Schweigert, P. (2000). Tangible systems, tangible outcomes. AAC augmentative and alternative communication. 16. pp. 61–78. *Rowland, C., & Schweigert, P. Tangible symbol systems primer. Design to learn website. pp. 1–20

Symbols Communication Speech and language pathology Blindness equipment Augmentative and alternative communication