Examlex
Humans that fail to find the effects of methylphenidate rewarding differ from those who do in levels of:
Anxiety
A feeling of worry, nervousness, or unease, often about an imminent event or something with an uncertain outcome.
Obsession
A persistent, unwanted thought, idea, or image that an individual cannot control, causing significant anxiety or distress.
Climbing
The physical activity of ascending inclined structures or natural terrain using one's hands, feet, or other body parts for support and movement.
Thoughts
Mental processes that involve the organization and understanding of information, including beliefs, opinions, and intentions.
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