More specifically the way that stem cell research has been involved in neuroscience is through the treatment of neurodegenerative diseases and brain tumors. In these cases scientists are using neural stem cells to regenerate tissue and to be used as carriers for gene therapy. In general, neuroethics revolves around a cost benefit approach to find techniques and technologies that are most beneficial to patients. There has been progress in certain fields that have been shown to be beneficial when using stem cells to treat certain neurodegenerative diseases such as Parkinson's disease.