Which learning process involves an increased response due to a very intense stimulus?

The learning process that involves an increased response due to a very intense stimulus is sensitization. This phenomenon occurs when an organism experiences a strong stimulus, which heightens its response to that stimulus or other related stimuli. For example, if a dog is exposed to a loud noise that startles it, the dog's response to similar noises may become more pronounced in the future due to the heightened state of arousal.

Sensitization is particularly relevant in understanding behavioral responses because it illustrates how an organism can become more reactive to certain stimuli after experiencing something intense or threatening. This response enhances survival by making the organism more alert to potential dangers in their environment.

In contrast, habituation refers to a decrease in response to a repeated, non-threatening stimulus; adaptation is a more general term used in various contexts that could involve physiological and behavioral changes over time but does not specifically refer to response increases; and learned irrelevance signifies a situation where a stimulus has become irrelevant due to lack of association with significant outcomes, leading to a diminished response rather than an increase.