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-Sequential use of modalities that are not linked together in the same task. For example, recording speech and then closing all the unnecessary windows with a mouse.
The use of modalities is sequential, but they are linked together in the same task. For example, pointing an object with a mouse and giving a voice command to copy it.
The use of modalities is parallel, but they are not linked together. Usually the hardest kind of multimodal systems, but may result in a better efficiency with some training. For example, driving a car while speaking in a mobile phone
The use of modalities is parallel and they are linked together. For example, pointing and speech command at the same time.
Multimodal interaction and multisenory feedback can exert significant cognitive demands on users. Attention is selective and has limited capacity. Short term memory also has limitations. Consider human ability when designing the interface, essential for control and learning affordances