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Searching through alternating sequences: Working memory and inhibitory tagging mechanisms revealed using the MILO task.

We used the Multi-Item Localisation (MILO) task to examine search through two sequences. In sequential blocks of trials, six letters and six digits were touched in order. In mixed blocks, participants alternated between letters and digits. These conditions mimic the A and B variants of the Trail Making Test (TMT). In both block types, targets either vanished or remained visible after being touched. There were two key findings. First, in mixed blocks, reaction times exhibited a saw-tooth pattern, suggesting search for successive pairs of targets. Second, reaction time patterns for vanish and remain conditions were identical in sequential blocks -- indicating that participants could ignore past targets – but diverged in mixed blocks. This suggests a breakdown of inhibitory tagging. Introducing the simple vanish/remain manipulation to the context of TMT could thus provide additional diagnostic power to identify individuals with working memory and inhibitory control deficits.