The mind is conditioned to practice within a range of established thresholds in a system with varying patterns.
Any observed change in the patterns that fall outside of the threshold-bounds triggers the attention.
The delta of this deviation is under scrutiny. The time window of the observation leads to a biased view.
For the occurrence of the deviation should be understood in a wider time window.
Seeking to understand the variance in a shorter window skews the analysis.
Imagine a mapping between the frequencies of sound and their use by way of written form and the pattern based learning that establishes the thresholds.
Changing the patterns and the thresholds produces a variety in the system.