The structure of the training trials. Words are indicated by uppercase letters and objects by lowercase letters. The 30 trials are divided into 6 blocks, with each block defined by the word that is repeating. Potential influences on visual attention at three time scales are illustrated by the lines: (1) the increasing local novelty of the non-repeated object (relative to the repeated object) increases within each block; (2) the familiarity of individual visual objects increases across blocks; and (3) the number of correct word-referent co-occurrences increases across the 30 training trials. Spatial and temporal order variation of words and objects is not indicated in this table, nor is the order of trials within a block (which is randomly determined; see text for clarification).