We investigated the effects of interdimensional discrimination training in the temporal generalization gradient. In a matching-to-sample task, pigeons learned to choose key S after a T–s houselight sample and key NS in the absence of the houselight sample. For one group of pigeons, T = 20 s; for another, T = 10 s. Subsequently, houselight duration was varied to obtain temporal generalization gradients. Results showed that (a) proportion S increased as houselight duration ranged from 0 s to T s and then remained high for houselight durations longer than T; (b) the gradients were well described by negative-exponential functions; (c) these non-flat gradients were present from the beginning of testing, and; (d) the average gradients obtained with T = 20 s and T = 10 s overlapped when plotted in relative time. We conclude that temporal control does not require explicit discrimination training along the temporal dimension, and that temporal generalization gradients obtained with an interdimensional protocol show the scalar property of timing. We discuss how these findings challenge current models of timing.
BalciF., GallistelC. R., AllenB. D., FrankK. M., GibsonJ. M., & BrunnerD. (2009). Acquisition of peak responding: What is learned?Behavioural Processes, 80, 67–75.
3.
BoutonM. E., & García-GutiérrezA. (2006). Intertrial interval as a contextual stimulus. Behavioural Processes, 71, 307–317.
4.
BoutonM. E., & HendrixM. C. (2011). Intertrial interval as a contextual stimulus: Further analysis of a novel asymmetry in temporal discrimination learning. Journal of Experimental Psychology: Animal Behavior Processes, 37(1), 79–93.
5.
BushR., & MostellerF. (1955). Stochastic models of learning. New York: John Wiley & Son.
6.
CataniaA. C. (1970). Reinforcement schedules and psychophysical judgment: A study of some temporal properties of behavior. In SchoenfeldW. N. (Ed.), The theory of reinforcement schedules (pp. 1–42). New York: Appleton-Century-Crofts.
7.
ChurchR. M. (2003). A concise introduction to scalar timing theory. In MeckW. H. (Ed.), Functional and neural mechanisms of interval timing (pp. 3–22). Boca Raton, FL: CRC Press.
8.
ChurchR. M., & DelutyM. Z. (1977). Bisection of temporal intervals. Journal of Experimental Psychology: Animal Behavior Processes, 3, 216–228.
9.
ChurchR. M., & GibbonJ. (1982). Temporal generalization. Journal of Experimental Psychology: Animal Behavior Processes, 8, 165–186.
10.
ColwillR. M. (1984). Disruption of short-term memory for reinforcement by ambient illumination. The Quarterly Journal of Experimental Psychology Section B, 36(3), 235–258.
11.
DoughertyD. H., & WixtedJ. T. (1996). Detecting a nonevent: Delayed presence-versus-absence discrimination in pigeons. Journal of the Experimental Analysis of Behavior, 65(1), 81–92.
12.
ElsmoreT. F. (1971). Control of responding by stimulus duration. Journal of the Experimental Analysis of Behavior, 16, 81–87.
13.
ErnstM. D. (2004). Permutation methods: A basis for exact inference. Statistical Science, 19, 676–685.
14.
FleshlerM., & HoffmanH. S. (1962). A progression for generating variable interval schedules. Journal of the Experimental Analysis of Behavior, 5, 529–530.
15.
GallistelC. R. (1990). The organization of learning. Cambridge, MA: Bradford Books/MIT Press.
16.
GhirlandaS., & EnquistM. (2003). A century of generalization. Animal Behaviour, 66, 15–36.
17.
GibbonJ. (1977). Scalar expectancy theory and Weber's law in animal timing. Psychological Review, 84, 279–325.
18.
GibbonJ. (1981). On the form and location of the psychometric bisection function for time. Journal of Mathematical Psychology, 24, 58–87.
19.
GibbonJ. (1991). Origins of scalar timing theory. Learning and Motivation, 22, 3–38.
20.
GibbonJ., ChurchR. M., & MeckW. H. (1984). Scalar timing in memory. In AllanL. & GibbonJ. (Eds.), Timing and time perception (pp. 52–77). New York: Annals of the New York Academy of Sciences.
21.
GrantD. S. (1991). Symmetrical and asymmetrical coding of food and no-food samples in delayed matching in pigeons. Journal of Experimental Psychology: Animal Behavior Processes, 17(2), 186–193.
22.
GuttmanN., & KalishH. (1956). Discriminability and stimulus generalization. Journal of Experimental Psychology, 51, 79–88.
23.
HonigW. K., & UrcuioliP. J. (1981). The legacy of Guttman and Kalish (1956): 25 years of research on stimulus generalization. Journal of the Experimental Analysis of Behavior, 36, 405–445.
24.
JenkinsH. M., & HarrisonR. H. (1960). Effect of discrimination training on auditory generalization. Journal of Experimental Psychology, 59, 246–253.
25.
JozefowiezJ., StaddonJ. E. R., CeruttiD. T. (2009). The behavioral economics of choice and interval timing. Psychological Review, 116, 519–539.
26.
KaiserD. H. (2008). The proportion of fixed interval trials to probe trials affects acquisition of the peak procedure fixed interval timing task. Behavioural Processes, 77, 100–108.
27.
KilleenP. R., & FettermanJ. G. (1988). A behavioral theory of timing. Psychological Review, 95, 274–295.
28.
LejeuneH., & WeardenJ. H. (2006). Scalar properties in animal timing: Conformity and violations. The Quarterly Journal of Experimental Psychology, 59, 1875–1908.
29.
MachadoA. (1997). Learning the temporal dynamics of behavior. Psychological Review, 104, 241–265.
30.
MachadoA., MalheiroM. T., & ErlhagenW. (2009). Learning to time: A perspective. Journal of the Experimental Analysis of Behavior, 92(3), 423–458.
MellgrenR. L., MaysM. Z., & HaddadN. F. (1983). Discrimination and generalization by rats of temporal stimuli lasting for minutes. Learning and Motivation, 14, 75–91.
RescorlaR. A. (2001). Experimental extinction. In MowrerR. R. & KleinS. B. (Eds.), Handbook of contemporary learning theories (pp. 119–154). Mahwah, NJ: Lawrence Erlbaum.
35.
RichelleM., & LejeuneH. (1980). Time in animal behavior. New York: Pergamon.
36.
RileyD. A. (1968). Discrimination learning. Boston: Allyn & Bacon.
37.
RillingM. (1977). Stimulus control and inhibitory processes. In HonigW. K. & StaddonJ. E. R. (Eds.), Handbook of operant behavior (pp. 432–480). Englewood Cliffs, NJ: Prentice Hall.
38.
RussellR., & KirkpatrickK. (2007). The role of temporal generalization in a temporal discrimination task. Behavioural Processes, 74, 115–125.
39.
SherburneL. M., & ZentallT. R. (1993a). Asymmetrical coding of food and no-food events by pigeons: Sample pecking versus food as the basis of the sample code. Learning and Motivation, 24(2), 141–155.
40.
SherburneL. M., & ZentallT. R. (1993b). Coding of feature and no-feature events by pigeons performing a delayed conditional discrimination. Animal Learning & Behavior, 21(2), 92–100.
41.
SiegelS. F. (1986). A test of the similarity rule model of temporal bisection. Learning and Motivation, 17, 59–75.
42.
SpetchM. L., & ChengK. (1998). A step function in pigeons’ temporal generalization in the peak shift task. Animal Learning and Behavior, 26, 103–118.
43.
StubbsD. A. (1968). The discrimination of stimulus duration by pigeons. Journal of the Experimental Analysis of Behavior, 11, 223–238.
44.
SwitalskiR. W., LyonsJ., & ThomasD. R. (1966). Effects of interdimensional training on stimulus generalization. Journal of Experimental Psychology, 72, 661–666.
45.
TerraceH. S. (1966). Stimulus control. In HonigW. K. (Ed.), Operant behavior: Areas of research and applications (pp. 271–344). Englewood Cliffs, NJ: Prentice Hall.
46.
ThomasD. R. (1969). The use of operant conditioning techniques to investigate perceptual processes in animals. In GilberR. M. & SutherlandN. S. (Eds.), Animal discrimination learning (pp. 1–33). New York: Academic Press.
47.
Vieira de CastroA. C., & MachadoA. (2012). The interaction of temporal generalization gradients predicts the context effect. Journal of the Experimental Analysis of Behavior, 97, 263–279.
48.
Vieira de CastroA. C., MachadoA., & TomanariG. Y. (2013). The context effect as interaction of temporal generalization gradients: Testing the fundamental assumptions of the Learning-to-Time model. Behavioural Processes, 95, 18–30.
49.
WeismanR., BrownlieL., OlthofA., NjegovanM., SturdyC., & MewhortD. (1999). Timing and classifying brief acoustic stimuli by songbirds and humans. Journal of Experimental Psychology: Animal Behavior Processes, 25, 139–152.
50.
WilsonB., & BoakesR. A. (1985). A comparison of the short-term memory performances of pigeons and jackdaws. Animal Learning & Behavior, 13(3), 285–290.
51.
WixtedJ. T. (1993). A signal detection analysis of memory for nonoccurrence in pigeons. Journal of Experimental Psychology: Animal Behavior Processes, 19(4), 400–411.
