General Synonyms:
* Mental
* Intellectual
* Mindful
* Thinking
* Perceptual
* Reasoning
* Understanding
* Knowing
* Conscious
* Rational
More Specific Synonyms:
* Analytical (for focusing on analysis and problem-solving)
* Conceptual (for relating to concepts and ideas)
* Epistemological (for relating to the nature of knowledge)
* Logical (for relating to reasoning and deduction)
* Memorizing (for relating to memory and recall)
* Perceptive (for relating to insight and understanding)
* Problem-solving (for relating to finding solutions)
* Reasoning (for relating to logical thought and analysis)
* Strategic (for relating to planning and decision-making)
For specific situations, you may also consider:
* Learning (for processes related to acquiring new knowledge)
* Processing (for the way information is handled by the brain)
* Understanding (for the ability to grasp and interpret meaning)
* Awareness (for the state of being conscious and mindful)
The best synonym will depend on the specific context and what you are trying to convey.