Unconscious humans, autonomous machines and the difficulty of knowing which animals are sentient

The framework proposed by Crump et al. still leaves much doubt about whether invertebrates such as crabs are sentient. For example, many complex behaviours - even in humans occur without sentience. Also, simple machines could easily meet all of al.’s eight criteria for Acknowledging the limitations what we currently know sentience is important both formulating legislation correctly and advancing scientific understanding this most puzzling biological phenomena.