Final answer:
Max's adjustment to the ceiling fan's noise is an example of habituation, where he becomes used to the noise after repeated exposure.
Step-by-step explanation:
Max's filtering out of the fan's noise is best described as habituation. This is a psychological phenomenon where a person becomes accustomed to a sensory stimulus after repeated exposure. Over time, the brain deems the fan noise as non-threatening and redundant, which reduces the response to the stimulus, allowing Max to sleep normally despite the noise.