Gaps in current studies and future studies suggestions
There is a great deal of noise in present literature on behavioural lateralization in zebrafish this is mainly caused by procedural inaccuracies and poorly understood biological nature of zebrafish.
First procedural inaccuracy is “mirror test” two studies mentioned above use the same test but for different viewing reflection as two different stimuli. In the study conducted Sovarano and Andrew in 2006 view reflection’s action novel and observing behavioural lateralization in response to novelty. Whereas the study conducted by Ariyomo and Watt in 2013 view reflection as another conspecific and observed behavioural lateralization in response to aggression. Both novelty and aggression induce negative cognitive bias, so right hemisphere hypothesis still stand; however, true nature of mirror stimulus must be established for more accurate results. Furthermore, possibility of self-awareness in zebrafish has not been considered