“The whole function of the brain is summed up in: Error Correction.” So wrote W. Ross Ashby, the British psychiatrist and cyberneticist, some half a century ago.
The W. Ross Ashby Digital Archive site 
This remark is simply described as a “scribbled, undated, aphorism” in the online digital archive of the scientist's journal: See rossashby .
Andy Clark, Predictive Brains: […] one of the brain's key tricks, it now seems, is to implement dumb processes that correct a certain kind of error: error in the multi-layered prediction of input.
[…] Errors in predicting lower level inputs cause the higher-level models to adapt so as to reduce the discrepancy. Such a process, operating over multiple linked higher-level models, yields a brain that encodes a rich body of information about the source of the signals that regularly perturb it.