AUTHOR=Hung Chou P. , Cui Ding , Chen Yueh-peng , Lin Chia-pei , Levine Matthew R. TITLE=Correlated activity supports efficient cortical processing JOURNAL=Frontiers in Computational Neuroscience VOLUME=8 YEAR=2015 URL=https://www.frontiersin.org/journals/computational-neuroscience/articles/10.3389/fncom.2014.00171 DOI=10.3389/fncom.2014.00171 ISSN=1662-5188 ABSTRACT=

Visual recognition is a computational challenge that is thought to occur via efficient coding. An important concept is sparseness, a measure of coding efficiency. The prevailing view is that sparseness supports efficiency by minimizing redundancy and correlations in spiking populations. Yet, we recently reported that “choristers”, neurons that behave more similarly (have correlated stimulus preferences and spontaneous coincident spiking), carry more generalizable object information than uncorrelated neurons (“soloists”) in macaque inferior temporal (IT) cortex. The rarity of choristers (as low as 6% of IT neurons) indicates that they were likely missed in previous studies. Here, we report that correlation strength is distinct from sparseness (choristers are not simply broadly tuned neurons), that choristers are located in non-granular output layers, and that correlated activity predicts human visual search efficiency. These counterintuitive results suggest that a redundant correlational structure supports efficient processing and behavior.