Before revision: Level of Communication Means of Communication Presymbolic Body and limb movements, Gestures, Vocalizations Concrete Symbolic Symbolic gestures and vocalizations, Tangible Symbols: Objects (three-dimensional) & Pictures (two-dimensional) Abstract Symbolic Speech, Sign Language, Printed Language , Braille, Abstract shapes, Abstract graphics History Historically, objects and pictures have frequently been used as communication devices.Park, K. (1995) Using objects of reference: a review of the literature.
After revision: Level of Communication Means of Communication Presymbolic Body and limb movements, gestures, vocalizations Concrete Symbolic Symbolic gestures and vocalizations, Tangible Symbols: Objects (three-dimensional) & Pictures (two-dimensional) Abstract Symbolic Speech, sign language, printed language , Braille, abstract shapes, abstract graphics History Historically, objects and pictures have frequently been used as communication devices.Park, K. (1995) Using objects of reference: a review of the literature.