 Likewise, solitariness, lack of physical activity, and lack of appetite all eliminate sources of distraction, such as social interactions, navigation through the environment, and "oral activity", which disrupt stimuli from being processed.Depression, especially in the modern context, may not necessarily be adaptive.The ability to feel pain and experience depression, are adaptive defense mechanisms, but when they are "too easily triggered, too intense, or long lasting", they can become "dysregulated".