The bottleneck mechanism occurs when the first stimulus is being processed, any other stimuli cannot be processed. The processing of the second stimulus is postponed which slows down reaction time. Neurons that take in information send this information to specific neural networks in different locations.
Sometimes the more telling statistic is the median, instead of the average â but in the age of average, it might take some effort to embrace the more accurate number.
As such, you should use the mean and the standard deviation. The reason is that the mean minimizes a cost function that is the square of the errors. Either in a Bayesian or in a Frequentist framework, the mean provides the most efficient use of information. For the second you should use the median and the IQR. The reason is pretty ugly however.