Preliminary analyses investigated accuracy scores to ascertain
that all participants made a real attempt to select the largest central
target. For that purpose, we looked at how often the veridically
largest target was selected by each participant, and for both blocks,
irrespective of whether this target was the constant or the variable
one, and calculated the overall accuracy scores of each participant.
Trials in which the two targets were identical were excluded from
this analysis because there was no correct answer in these probe
trials. Findings indicated that the two species performed reliably
above chance on average in both baseline