This longitudinal study looked at how communication developed in seven deaf infants (ages 6-18 months) with either deaf or hearing parents. The children were video- recorded in interactional settings with their parents in their home every second month. A parallel study was conducted with seven blind infants and three severely visually impaired…

Describes an experiment comparing communication accuracy within and between various sign languages from different countries. Longer communications were generally more successful than shorter ones. Deaf signers understand their own sign language better than they do foreign sign languages. (Author/LMO)