Julia Vogel Adrian Schwaninger Christian Wallraven Heinrich H. Bülthoff Categorization of natural scenes: local vs. global information. 33-40 2006 APGV http://doi.acm.org/10.1145/1140491.1140498 conf/apgv/2006 db/conf/apgv/apgv2006.html#VogelSWB06