The left hemisphere or concrete mind structures and stores information in a linear, precise and exact manner. It's calculating, logical, rational, digital, mathematical and auditory. It deals with things that are empirical and can be measured, weighed and verified objectively. Things that are physical and material such as space, atoms, matter, electrons, molecules, brains and neurons. It relies on facts, figures, measurements, concrete knowledge, detailed explanations, rational thought, memory, reason, logic, direct sense experience which is empirical, measurable and verifiable.
Science is the product of left hemisphere function.
The concrete mind uses deduction to arrive at conclusions. It goes from the general to the specific, from cause to effect. Socrates is a man. Therefore, Socrates is mortal. It assumes and preconceives.