On his first day of work at the bakery, Brad was nearly overwhelmed by the sweet odor of the baked goods. However, by lunchtime, he did not even notice the smell. This is an example of

Sensory adaptation.

Explanation:

Sensory adaptation is the decrease in the awareness of a stimulus due to constant exposure to it.  The sensitivity decrease of this stimulus allows us to pay attention to other stimuli in the environment. This phenomenon happens with smell, taste, sight, hearing, and touch, in other words, with the five senses.

In the described situation, we can see that as Brad smelled the sweet odor constantly, his sensory receptors became less aware of the overwhelming smell and allowed him to pay attention to other stimuli in the bakery.

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