Table 1.

Experiment block structure

Foreground	Background	Speaker foreground (background)	Number of trials per block
Equations	—	Male	10
Sentences	—	Male	10
Equations	—	Female	10
Sentences	—	Female	10
Sentences	Equations	Female (male)	6
Equations	Sentences	Female (male)	6
Sentences	Equations	Male (female)	6
Equations	Sentences	Male (female)	6
Sentences	Equations	Female (male)	6
Equations	Sentences	Female (male)	6
Sentences	Equations	Male (female)	6
Equations	Sentences	Male (female)	6

The experiment consisted of four single speaker blocks followed by eight cocktail party blocks. Each trial was 18 s in duration and consisted of 10 equations (1.8 s × 10 = 18 s) or 12 sentences (1.5 s × 12 = 18 s). The speaker gender was counterbalanced across subjects (i.e., the order of column 3 was changed).