Skip to main content
. 2014 Sep 17;9(9):e107794. doi: 10.1371/journal.pone.0107794

Table 3. Summary of training phases and cognitive bias testing phase.

Phase Training Objective Structure Criterion
TP1 Dogs to move nose through photointerruptor beam towards visual target. Dogs may receive a maximum of one reward every 8 seconds (s). Reward trigger rate of at least 8 in 2 of 3 training blocks
TP2 Dogs to move their nose to the target on cue. Milk tone played, 10 s window to respond, 20 s Inter-trial Interval (ITI). Touches target at least 80% of time after tone for 2 of 3 training blocks
TP2A Reduce reinforcement rate Milk tone played, 10 s window to respond, 30 s ITI. Touches target at least 80% of time after tone for 2 of 3 training blocks
TP3 Dogs to discriminate between 2 tones. Milk or water tone played pseudo-randomly, 10 s window to respond, 20 s ITI. Milk latency significantly shorter than water latency (Mann-Whitney U-test)
CBT Test cognitive bias 2×9 probes, 15 water, 15 milk presented pseudo-randomly, 20 s ITI. N/A