Figure 1.

Linear ballistic accumulator (LBA) model of working memory search and decision- making process assuming an underlying coactive mental architecture. On any given trial, this LBA unit governs the time taken to execute a target (T) or distractor (D) response in the presence of some memory probe stimulus. Working memory search and decision-making process begins and ends with some non-decision time (t₀) related to sensory input and motor response output. A decision is determined by the rate at which evidence accumulates for target (VT) and distractor (VD), with drift-rates initiating from some starting point (A) and racing one another toward some threshold for sufficient evidence (b). Whichever drift-rate crosses threshold first governs the response. Evidence accumulates according to a standard normal distribution with mean 0 and unit variance.