Mean RT (A) and Attention scores (B) for 5, 7, and 10-month-old infants. Cue Facilitation = (Tone RT - Valid RT)/Tone RT; Cue Interference = (Invalid RT – Tone RT)/Tone RT; Cue Competition = (Double RT – Valid RT)/Tone RT. Note: Asterisks at the base of the Cue Facilitation, Cue Interference, and Cue Competition bars indicate significance compared to zero, asterisks above the bars indicate significant between-age differences. For all comparisons, significance is indicated as follows: * p<=.05, **p<=.01, and ***p<=.001. Error bars represent 1 SEM.