What process occurs when a reaction is learned so well that it is performed subconsciously?

The correct answer to the question is the concept of an automatic response. This term refers to actions that become so practiced that they can be performed with little to no conscious thought, as a result of extensive learning and repetition. When a reaction is learned to this extent, it allows individuals to perform complex tasks efficiently and without the interference of conscious processing, which can be particularly beneficial during high-pressure situations.

In the context of aviation and aerospace physiology, automatic responses are crucial. Pilots and crew members often need to react quickly to unexpected changes or challenges without the luxury of deliberation. This allows for greater focus on situational awareness and other critical tasks.

The other options do not accurately describe the process of a well-learned reaction being executed subconsciously. Negative transfer refers to a situation where previous learning hinders the acquisition of new skills. Reflex action involves involuntary responses to stimuli and does not require prior learning through experience. Skill acquisition is the overall process of learning and developing skills, which may encompass a range of conscious and subconscious practices but does not specifically indicate that a reaction has become automatic to the degree described in the question.