Variation is the differences between individuals of the same species, caused by genetic and environmental factors. Surveys into variation give data that are continuous, which means to come in a ...

Analyses of this rich resource have created a catalogue of the different types of variation present, and revealed their potential functional impact and how this information could help to identify ...

She also investigates the consequences that this variation has for listeners, with the finding that it is often actually beneficial. One specific type of variation she examines in current research is ...