1).

Schematic diagram of the 9 possible conditions (3 masker configurations × 3 listening modes). Binaural listening conditions (1,2,3) are in the top row, Left-ear conditions (4,5,6) in the middle row, and Right-ear listening conditions (7,8,9) in the bottom row. Target-Masker in front occurs in the three conditions in the left column (1,4,7). Masker on the left is shown in the conditions in the middle column (2,5,8) and masker on the right is shown in the three conditions in the right column (3,6,9).