 A different sort of objection to inner-sense theory is developed by Carruthers (2000). It starts from the fact that the internal monitors postulated by such theories would need to have considerable computational complexity in order to generate the requisite higher-order experiences. In order to perceive an experience, the organism would need to have mechanisms to generate a set of internal representations with an analog or non-conceptual content representing the content of that experience, in all its richness and fine-grained detail. And notice that any inner scanner would have to be a physical device (just as the visual system itself is) which depends upon the detection of those physical events in the brain that are the outputs of the various sensory systems (just as the visual system is a physical device that depends upon detection of physical properties of surfaces via the reflection of light). For it is hard to see how any inner scanner could detect the presence of an experience qua experience. Rather, it would have to detect the physical realizations of experiences in the brain, and construct the requisite higher-order representation of the experiences that those physical events realize, on the basis of that physical-information input. This makes it seem inevitable that the scanning device that supposedly generates higher-order experiences of our first-order visual experience would have to be almost as sophisticated and complex as the visual system itself.