Cognitive genomics is the field of science that studies how genes affect the way we think and act. Scientists use different technologies to measure what happens in our brain when we think, make decisions, and do other things that involve our mind. They look at genes to see if some of them might be linked to differences in how we think or act. Understanding this connection can help scientists develop better treatments for diseases like Alzheimer's and Parkinson's that affect how we think and behave.