Jeanne et al. show that changes in correlation  between neurons enhances learning. It improves neural discrimination by enhancing noise suppression.
http://www.cell.com/neuron/abstract/S0896-6273(13)00181-5

Preview by Frédéric E. Theunissen, Julie E. Elie:
http://www.cell.com/neuron/abstract/S0896-6273(13)00314-0