This article examines variation in American Sign Language (ASL)
signs produced with a 1 handshape, which include signs of nearly
all grammatical classes. Multivariate analysis of more than
5,000 tokens, extracted from informal conversations among more
than 200 signers in seven different regions of the United States,
indicates that variation in the form of these signs is conditioned
by multiple linguistic and social factors. Significant factor
groups include grammatical function and features of the preceding
and following segments, as well as a range of social constraints
including age, regional origin, and language background. Two
findings are especially notable. First, although the results
for preceding and following segment effects show evidence of
progressive and regressive assimilation, grammatical function
is the first-order linguistic constraint on the use of two of
the three main variants. Second, signers in all regions of the
United States show similar patterns of variation, thus providing
evidence that ASL signers constitute a single “speech”
community.