Final answer:
Extensive training in a specific target search can lead to automaticity, where tasks are performed efficiently and without conscious effort. However, this can also result in degraded performance on tasks that require attention to multiple stimuli or a broader scope of information.
Step-by-step explanation:
Extensive training in a specific target search can lead to automaticity, which is the ability to perform a task efficiently and without conscious effort. When a task becomes automatic, it no longer requires conscious attention, and the performance becomes more accurate and faster.
However, extensive training and automaticity can also have drawbacks. It can lead to a narrowed focus, where individuals become less aware of other stimuli outside their specific area of focus. This narrowed focus can result in degraded performance on tasks that require attention to multiple stimuli or a broader scope of information.
Therefore, the correct answer to the question is d. Automaticity, as it captures the outcome of extensive training in a target search.