However, it is relevant to note that most of these experiments did not use natural stimuli to provoke these responses: this may not fit in directly to the efficient coding hypothesis because this hypothesis is concerned with natural image statistics. In his review article Simoncelli notes that perhaps we can interpret redundancy in the Efficient Coding Hypothesis a bit differently: he argues that statistical dependency could be reduced over "successive stages of processing", and not just in one area of the sensory pathway.
It is significant to observe that most experiments did not use natural stimuli for these responses; this may contradict the efficient coding hypothesis, which emphasizes natural image statistics. Simoncelli suggests a reinterpretation of redundancy in the Efficient Coding Hypothesis: he argues that statistical dependency can be minimized across successive processing stages rather than just within one sensory pathway.