1. Interior colors, textures, and lighting features both relax and stimulate mental activity . 2. Searle divides intentional states into low-level brain activity and high-level mental activity . 3. Other researchers have discovered evidence that mental activity may guard against dementia. 4. Crichton says, " has the nice quality of stopping mental activity ." 5. Conversational give-and-take can be among the most enjoyable and rewarding of mental activities . 6. One solution was to refrain from any physical or mental activity . 7. Patients usually develop seizures and progressive deterioration of coordinated muscular and mental activities . 8. Learning is a mental activity and its efficiency has always been fairly low. 9. Scientific neutrality is thus pursued by identifying mental activity with thinking. 10. But any mental activity _ even math _ people can learn. 
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