How Significant the optogenetics in terms of behavioral research?

So-called neuronal (or opsin) optogenetics is extremely signifiant in behavioural research, as it enables highly targeted activation or inhibition of specific neuronal populations combined with simultaneous behavioral assesment. Optogenetic induction of cell death could also be used in neuroscience to study effect of specific types of cell death in neuroinflammation and neurodegeneration or to assess behavioural impact following targeted elimination of neuronal populations.