The human body may survive a mission to Mars better than our minds. New research studied the psychological impact of long-term spaceflight by testing the creative-thinking and problem-solving skills of 8 crews on fake space missions. The teams only successfully completed 20-60% of their tasks.

See the source article by following the link below:
The human body may survive a mission to Mars better than our minds. New research studied the psychological impact of long-term spaceflight by testing the creative-thinking and problem-solving skills of 8 crews on fake space missions. The teams only successfully completed 20-60% of their tasks.