This study describes speech production experiments designed to determine the domain of accentual lengthening in Scottish English. Results suggest that accentual lengthening affects not only the syllable which bears the pitch accent (phrasal stress), but extends rightwards beyond this syllable. Secondly, the amount of lengthening on a syllable adjacent to a pitch accent appears to depend upon its membership in a pitch accented unit. Several candidates for the accentual-lengthening unit are entertained.