The aim was
to investigate whether there is a hierarchy of difficulty for these tasks and, therefore,
whether BSL vocabulary acquisition proceeds incrementally, as is the case for spoken
languages. Twenty-four deaf participants (aged 5–15 years), all of whom were BSL
users, performed with greatest accuracy on meaning recognition and least accurately on
meaning recall. The results indicate that signers’ knowledge of mapping between form
and meaning in BSL signs is not an all-or-nothing phenomenon but depends on what
the learner is required to do with that knowledge, as is the case for spoken languages.