Skip to main content
. Author manuscript; available in PMC: 2010 Nov 1.
Published in final edited form as: Behav Processes. 2009 Jul 8;82(3):229–235. doi: 10.1016/j.beproc.2009.06.010

Figure 4.

Figure 4

Mean number of pecks when the disc moved towards the hopper (filled circles) and when it moved away (open circles) as a function of the distance to the hopper.