Reading time differences (ms) for the ever items, S3, Experiment 3. The upper line is the invalid (d) minus valid (b) inference conditions, no NPIs. The lower line is the valid inference, NPI absent (b) minus valid inference, NPI present (a) condition. Values on the x-axis correspond to different regions of the sentence. The appropriate section of the ‘Campers’ item is shown on each region (words in square brackets correspond to the (a) or (d) version). Error bars correspond to the standard error of the difference for each region (subject analysis).