Figure 1.

Experimental schematic and behavioral results. A, Digitized patterns of sample syllable stimulus and subject vocal response. B, Subjects responded correctly on an average of 73 ± 2 of 80 two-syllable trials (91%; 2 SYL) and 50 ± 6 of 80 four-syllable trials (63%; 4 SYL), and accuracy rates were significantly different between the two conditions (p < 0.05). C, Average response latencies for two- and four-syllable conditions differed significantly (p < 0.05), at 640 ± 50 and 830 ± 60 ms, respectively.