Cumulative records for an individual bird from a single session during each season. Diagonal lines extending directly beneath the record (hash marks) indicate food reinforcement. Note there are no reinforcements earned during the spring season. Vertical lines extending from 100 to 0 responses (spring and fall only) are resets of the "pen" due to high rates of responding; this was done to keep the scale constant across each of the four records.
Jones et al. BMC Neuroscience 2010 11:87 doi:10.1186/1471-2202-11-87