The causes of congenital deafblindness are varied, resulting in a population with varied health, hearing, vision, other sensory, neurological and motor presentations all of which will affect how communication develops and what choices are made about the methods of communication used and taught.
In many individuals, speech is unlikely to develop to a functional level, or to be the most effective means of communication. The acquisition of symbolic understanding necessary for any form of language development is also a challenge.
As diverse as the congenitally deafblind population is, so are the methods of communication used. They include speech, sign language, other modified or simplified signing systems, all forms of Alternative and Augmentative Communication (AAC) and pre-intentional and intentional communicative behaviours.
If you are new to the area of communication methods for the congenitally deafblind, you may benefit from the page “Communicating” in the For Families and Carers area of the website. This provides an introduction to these forms of communication and to “Respectful Approach”. This section of the website:-
- expands on communication information in the Families and Carers section
- highlights areas for special consideration
- considers communication forms that are particularly unique to the congenitally deafblind population, including
- tactile signing methods
- interaction through shared touch
- bodily emotional traces (BETS)
Many AAC methods are introduced on the assumption that language in a spoken form is not going to be adequate for communication and therefore language symbols in a visual form will provide an alternative way to develop language and will result in better communication. Introducing these visual systems to someone with compromised visual development, needs to be done with good knowledge of the person who is deafblind’s visual capabilities and then designing visual symbols that are within these capabilities.
Design factors that may (depending on the individual) improve visual accessibility to picture symbols include:-
- Increased symbol size
- Decreased visual detail
- Use of solid strong colour
- Symbols that differ significantly from each other in shape and colour
- Symbols that stand out from the background they are placed against
- Symbols on plain, not patterned backgrounds
- Using light to highlight symbol of interest
- Using matt laminate that does not reflect light (glare) back into a person’s eyes
- Symbols that are removable from their display, so they can be viewed at optimal viewing position and distance
If your visual symbol system is a signing system, then increasing the visibility of the signs you make is an important consideration. This can be improved by:-
- Adequate lighting. Any light source, if not from above, should behind the person who is deafblind, illuminating who they are looking at and not shining into the eyes of the person who is deafblind
- The signer wears plain clothing that contrasts to the colour of their skin, providing a high contrast background against which to view the signs
- The space in which signs are performed may need to be reduced and should be performed within the visual field of the person who is deafblind
- Decreased distance between the signer and the person who is deafblind may be necessary
Note that: Movement and locations of signs may be detected, however details of hand shape may by missed
Object Symbol Systems
There will be cases that despite these modifications for improved visibility, visual development is just too compromised to make a visual communication system viable. It may be then that a tactile system would be considered, where the language or message symbols are recognised primarily through touch and the tactile properties of the symbols. Again however, we are assuming that the motor system and tactile sense are adequate for this task. Access the Tangible Symbol System Primer in the “See also” sidebar to learn more about Object Symbol Systems.
Speech Generating Devices
If an appropriate symbol system for communication has been determined, it may be possible to transfer these symbols to a device that will output a spoken message. When compared to devices designed for a hearing, seeing population, speech generating devices for use by someone who is congenitally deafblind may be different in that they may:-
- Have adequate space to display tactile symbols
- Have increased illumination or lighting to make symbols more visible
- Display fewer, larger picture symbols, with greater space between symbols
- Vibrate when a spoken message is activated (as spoken message may not be heard by the user)
Example of the use of tangible symbols on the Symbol Communicator for the Visually Impaired by Enabling Devices.
Tactile Forms of Signing
Another way to introduce language symbols that can be felt, rather than seen, is by modifying visual hand signs to incorporate a touch component. Note however, that touch and vision may also be used together, rather than exclusively. Information from one sense may be used to confirm or add to information received through another. Tactile methods of signing used with people who are congenitally deafblind usually need to be distinguished from tactile forms of signing used by people with acquired deafblindness. Forms of tactile sign used by those who have acquired deafblindness may be referred to by the term “Tactile” and involve tactile modifications to an existing officially recognised sign language and are not covered in this section.
While it would be convenient to use the same tactile signs with everyone, tactile signing systems are generally developed for the individual. This is because individuals recognise, tolerate and understand touch differently and have different communication needs. Making a record of tactile signs used with an individual, by writing descriptions and taking photos and video is a great start to ensure everyone is communicating the same messages in the same way.
When developing a touch system of communication be mindful that we all have a different capacity to tolerate and accept touch on different parts of our bodies and from different people. Develop in close conjunction with those who know the person who is deafblind best.
Types of signs combined with touch for people who are congenitally deafblind include:-
Signs are made onto the body of the person who is deafblind by the communication partner. The officially recognised sign from the regional sign language is used as a starting point, to develop the body sign. Modifications made to the sign will depend on how the person who is deafblind tolerates that type of touch on any given part of his/her body.
This type of signing is usually used for receptive language development and sending a message to the person who is deafblind. This system is unlikely to transpose to an expressive method, as the person who is deafblind receives a particular touch sensation, but is unlikely to know how that touch was created by the communication partner, and therefore will have a limited capacity to know how to recreate that sign themselves. Co-active and hand-under-hand methods are designed with expressive communication in mind.
The signer makes the sign for cat (flat hand making a stroking movement) on the back of the hand of the person who is deafblind
Image from: The Learning Place
The person who is congenitally deafblind places their hands over the hands of the person signing to them, feels the shape of the hand and the movement of the sign, they are free to pull their hands away if they wish.
The hands of the person who is congenitally deafblind are manipulated into the hand shape and movement of the sign. One or two hands can be used. This method can be used to develop receptive and expressive signed communication. There is some debate about whether signs felt in this manner, can be independently reproduced by the person who is deafblind.
Co-active sign for dance
The signer takes the hand of the person who is deafblind and shapes their hand so their index and middle fingers are pointed out and the other fingers are tucked under. Their index and middle fingers move back and forth in small arcs like dancing legs
Image from The Learning Place
While not recognised as a signing system as such, is a frequently used method of touching the body or around the body so that the person who is congenitally deafblind will feel direct touch, vibration or movement of air on their body. Each type of touch cue has a different meaning and are generally used to let the person who is congenitally deafblind know what is about to happen or to give instructions. Touch cues do not use a conventional signing system as their starting point and are not designed to be used more than one at a time (eg to form a sentence)
Tactile Finger Spelling
The regional finger spelling alphabet is taken and adapted to be performed onto one hand of the person who is deafblind. A high degree of language competence and literacy potential is required. When introduced it may be to sign the initial of people’s names for example.
Is there a language of deafblindness?
So far, systems of symbols and communication that have been created by hearing and/or seeing people and taught to people who are deafblind have been discussed. Are there forms of interaction or communication that emerge purely from the experience of deafblindess, from people who are congenitally deafblind themselves?
Someone who is deafblind will not perceive aspects of an event, object or experience in the same way a person with sight and hearing would perceive them. What they find meaningful or pertinent will be different because of the different input from and the different balance between their senses.
A person who is deafblind may remember an experience as the feeling or impression it left on a particular part of their body or a movement repeated during that experience or a particular smell, which they soaked up by taking repeated deep breaths. When they recreate this outside of that context, hearing, seeing people, not necessarily aware of the context that the movement of gesture arose in, may see these “re-creations of movement” as stereotypic movements or self stimulation. They are not necessarily aware of the exciting drumming session in music yesterday, or the rocking of the boat during the ferry trip, or that the person who is deafblind always rings the brass bell at the front door of grandma’s house, with a downward tugging motion.
The Deafblind International Communication Network called these spontaneous gestures or re-creations of movement ,Bodily Emotional Traces (BETs). They place emphasis on the fact that these gestures may arise from experiences that had an emotional impact on the individual who is deafblind. We do not want to miss these when they occur and mistakenly interpret them as behaviours will little or no communicative potential. BETs can be acknowledged and affirmed by a communicative partner who can step into the experience of the individual who is deafblind, repeat the gestures or movements back to them, in a way that can be felt and recognised by the individual who is deafblind. If BETs are viewed and responded to as communicative attempts, rather than stereotypic behaviours, the channels for opening up communication broaden again.
The topic of developing communication through touch and movement, initiated by a person who is deafblind has been explored by a number of authors and is receiving more attention and recognition with it becoming the topic of several recent Masters and Doctoral thesis.
Miles, B (1999) Remarkable Conversations – A Guide to Developing Meaningful Communication with Children and Young Adults who are Deafblind
Daelman M, Janssen M, Larsen F, Nafstad A, Rodbroe I, Souriau J, and Visser TM (2004).
Congenitally deaf blind persons and the emergence of social and communicative interaction.
Communication Network Update Series, Book 2
Bloeming-Wolbrink, K (2007) What is on your mind?: Expressions based on a Bodily Emotional Trace (BET) in the communication with persons who are congenitally deafblind
Forster, S (2008) HOP: Hanging Out Program: Interaction for people at risk of isolation
Hart, P (2010) Moving beyond the common touchpoint – discovering language with congenitally deafblind people