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. Author manuscript; available in PMC: 2015 Nov 5.
Published in final edited form as: Adv Exp Med Biol. 2014;829:209–234. doi: 10.1007/978-1-4939-1782-2_12

Figure 11.

Figure 11

Normal, peak-shaped, scalar responding at a time in between the trained criterion times when tested with the stimulus compound. Rats were trained that one modal stimulus (e.g., a tone) predicted probabilistic food availability (25% of tone trials) at 10s, whereas a different modal stimulus (e.g., a light) predicted probabilistic food availability (50% of light trials) at 20s. The different probabilities of reinforcement led to equivalent peak rates on the component stimuli probe trials as shown (Top). Presentation of the stimulus compound (tone+light) led to responding that peaked in between the criterion times. These compound trials were never reinforced. The bottom panel shows the superimposition of component and compound responding after normalizing the response functions by the obtained peak times, thereby indicating that the compound response was scalar. Such a result strongly suggests normal timing processes operating on an average temporal expectation. Figure from Swanton, D.N., Gooch, C.M, & Matell,M.S. . Averaging of temporal memories by rats. Journal of Experimental Psychology: Animal Behavior Processes, 35(3), 434-439, 2009, APA, with permission.