There are very specific aspects of learning that are dependent on neurogenesis, such as spatial learning and emotional memory. Newly generated neurons are recruited into existing networks, strengthening or developing pre-existing connections in the brain. Behaviors and conditions that influence plasticity and neurogenesis include sleep, nutrition, exercise, stress (cortisol levels), and happiness (dopamine levels). For example high levels of stress tend to correlate with low performance — but low levels of stress also correlate with low performance. A moderate amount of stress results in the highest performance. What is the “moderate amount,” amount of stress, then,  to achieve active learning. Applied to teaching it includes implementing the “Mind, Brain and Education” (MBE) principle, and using various techniques in the classroom, like the i-clickers, multiple ways of presenting an important point, taking a break in a long class, encouraging a variety of forms of class participation,