Other notable findings referenced in this article, with caveat, shown to have some cognitive benefits in various circumstances include:

Molecular Compounds

• Nicotine and stimulants (Ritalin & Aderall) (refer to the article  for the strong caveats)

Psychological Factors

• Placebo effect
• Motivation and reward
• Thinking about your genetic origin
• A positive mood
• Being told or feeling that you belong to a group that does good

Reaching Natural Potential by Removing Impediments

• Reducing stress

Actively Raising Natural Potential

• Practice/Cognitive Training (the more you use a circuit, the better it gets, however, research so far suggests that cognitive training benefits only the task used in training and does not generalize to other tasks)

• More generalizable benefits:
  • Physical Exercise
  • Meditation
  • Strategy-heavy video games (with walks in between levels)
  • Continuous and new learning