Figure 1.

Chunk patterns and chunk rates for the 10-digit digit string 4259522560. The chunk pattern is 2222, with chunk rates of 1.8 Hz (inside δ) and 2.6 Hz (outside). Each chunk was synthesized as a two-digit unit, using the AT&T Text-to-Speech System accentuation (see text). Note that a particular two-digit chunk has the same acoustics, regardless of whether it occurs in the 1.8- or 2.6-Hz 2222 chunk condition (red box). The 1.8-Hz stimulus is generated by increasing the gap between the chunks (with identical chunk acoustics).