Heterotopia are nodules or clumps of misplaced neurons that did not move to the correct location in the brain during earlydevelopment. Heterotopia are common malformations of cortical development.
Other definitions: 1  Freshman: a student who has completed fewer than 30 credit hours. 2  Sophomore: a student who has completed 30 or more credit hours. 3  Part time: a student carrying fewer than 12 credit hours in a fall or spring semester.
Universities consider 12 credits for undergrads to be fulltime and 9 credits in grad school are fulltime. Grad school students often have funding jobs- teaching/research on top of those credits as well. Taking 12 credits per semeste rwould take 10, not 8 semesters to get 120 credits for an undergrad degree. By this logic taking more than 9 credits per semester seems to be needed to finish required grad coursework in a timely fashion.