Our sensory and cognitive systems of.. の意味は？

最後の一文の訳し方が分からないので教えて下さい。（our sensory..以降）

We are constantly required to process a wide range of information to make decisions. Sometimes, these decisions are trivial, such as what marmalade to buy. At other times, the stakes are higher, such as deciding which symptoms to report to the doctor. However, the fact that we are accustomed to processing large amounts of information does not mean that we are better at it (Chabris & Simons, 2009). Our sensory and cognitive systems have systematic ways of failing of which we are often, perhaps blissfully, unaware.

直訳と併せて意訳を教えていただけると助かります。よろしくお願いします。