They also confirmed that exposure to the smells usually did not wake the participants, and excluded the small proportion of trials in which they showed any signs of arousal or wakefulness in response to the smells.
Although there may be a dissociation between detection and localisation on a small proportion of trials, we find a number of factors that lead to the underestimation of localisation including stimulus variability, response imprecision and participant guesses.
Only a small proportion of trials were indexed in these databases.
The only difference between novel and repeated primes was that repeated primes appeared as targets on a small proportion of trials (10% in Experiment 1 and 5% in Experiment 2).
Only a very small proportion of trials (8% in Experiment one and 6% in Experiment two) were deleted in total after these exclusion criteria.
Online inspection confirmed good central fixation and post hoc analysis confirmed the occurrence of saccades >1° on only a small proportion of trials (<2%).
In the majority of cases, recommendations were made based on interim analysis in the interest of participant safety and it is reassuring that there was only a small proportion of trials where extended use of interim analysis or recommendations made by the DMC had the potential to introduce bias.
