Glossary

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Icon-Based Communication(also: Symbol-Based Communication, Picture-Based Communication)

Icon-based communication is a form of augmentative and alternative communication (AAC) in which users select graphic symbols or icons representing words, phrases, or concepts to construct messages. These systems are commonly used by individuals with severe speech impairments who…

Idiosyncratic Gesture(also: Personalised Gesture, Idiosyncratic Movement)

A body-based communicative movement whose form and meaning are specific to one individual (and often to one communication partner), rather than drawn from a shared vocabulary like American Sign Language. Idiosyncratic gestures are central to unaided AAC for many people with…

Imitation(also: Embodied Imitation)

The act of observing and reproducing another person's actions, gestures, or vocalisations. Imitation is a foundational social and developmental skill that supports language acquisition, motor learning, and the establishment of shared experience between a child and a caregiver or…

Improvisational Music Therapy(also: IMT, Creative Music Therapy)

A therapeutic approach in which the therapist and client spontaneously create music together without predetermined structure or composed material. This form of music therapy allows non-verbal communication and emotional expression through musical interaction, making it…

Indian Sign Language(also: ISL, Indo-Pakistani Sign Language, IPSL)

The sign language used predominantly by the Deaf community in India. Indian Sign Language has its own distinct grammar and vocabulary that differs substantially from American Sign Language (ASL) and other sign languages. ISL is used by millions of Deaf individuals across India…

Indirect speech act(also: Indirect request)

A linguistic utterance whose intended meaning differs from its literal meaning, commonly used in neurotypical communication for politeness or social convention. For example, "Can you pass the salt?" is literally a question about ability but is conventionally understood as a…

Information Theory(also: Shannon Theory, Mathematical Theory of Communication)

A mathematical framework developed by Claude Shannon in 1948 for quantifying the transmission, processing, and storage of information. Central concepts include entropy (the measure of uncertainty or unpredictability in a message source), information rate (the reduction of…

Interaction Symmetry(also: Balanced Interaction)

The degree to which conversation partners have equal opportunities and means to participate in an interaction. In face-to-face spoken conversation, interaction is relatively symmetric—both partners can speak, listen, and use non-verbal cues at comparable speeds. AAC…

Interactional Synchrony

The coordinated, often unconscious alignment of conversational partners' body postures, gestures, gaze, vocal rhythm, and facial expressions during social interaction. Research in social psychology and affective neuroscience has linked interactional synchrony to rapport,…

Interactive Communication Model

A model of communication that extends the linear model by incorporating feedback from the receiver back to the sender, creating a two-way exchange. In AAC contexts, interactive high-tech devices enable the AAC user to receive responses and adjust their communication accordingly,…

Intergenerational Communication(also: Cross-generational Communication)

Communication between people of different generations, particularly between older adults and younger family members or caregivers, which can be complicated by differing expectations, technology literacy levels, and communication styles. In accessibility and aging contexts,…

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