Figure 2:

Illustration of the Dot Pattern Expectancy Task. Shown is an example sequence of cue-probe stimuli and the type of response (target or non-target) a participant was required to make after each stimulus. The nomenclature for stimuli and trial types was adopted from the expectancy letter AX task. The valid cue pattern is referred to as “A” and the valid probe pattern is referred to as “X”. Non- “A” cue patterns are referred to as “B”-type cues, and non-“X” probe patterns are referred to as “Y”-type probes. A target response is required for “X” when it follows “A”, non-target responses are made for all other stimuli. The first pair of stimuli in the sequence represents an AX trial. The third and fourth stimuli together represent an AY type of trial, the fifth and sixth stimuli together complete a BX trial, and the seventh and eighth stimuli make up a BY type of trial.