Even though as far back as 1965, experiments with certain animals indicated that their brains were generating new nerve cells, many neurologists believed that this did not happen in humans.
Edhe pse që prej 1965 - s, eksperimentet e bëra me disa kafshë treguan se truri i tyre prodhonte qeliza të reja nervore, shumë neurologë besonin se kjo nuk ndodhte me njerëzit.