Previous research in this laboratory suggests that priming of the conditional stimulus (CS) in short-term memory may play a role in the trial-spacing effects in appetitive conditioning. For example, a nonreinforced presentation of a CS 60 s before a reinforced trial with the same CS produced slower acquisition than a CS presentation that occurred 240 s before the reinforced trial. The results were consistent with the self-generated priming mechanism proposed by Wagner (e.g., Wagner 1978, 1981). The present experiments extended the earlier work by examining the effects of trial spacing in extinction rather than acquisition. After conditioning with a mixture of intertrial intervals (ITIs), rats received extinction with ITIs of 60 or 240 s, longer or shorter values, or different ways of “chunking” extinction trials in time. Although trial spacing produced effects on extinction performance that were consistent with our previous research on acquisition, there were few long-term differences in spontaneous recovery or in reinstatement. Short ITIs in extinction appear to affect extinction performance more than they affect extinction learning. Mechanisms of trial spacing in conditioning and extinction are discussed.
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References
1.
BarelaP. B. (1999). Theoretical mechanisms underlying the trial-spacing effect in Pavlovian fear conditioning.Journal of Experimental Psychology: Animal Behavior Processes25, 177–193.
2.
BarnetR. C.GrahameN. J.MillerR. R. (1995). Trial spacing effects in Pavlovian conditioning: A role for local context.Animal Learning & Behavior23, 340–348.
3.
BjorkR. A.BjorkE. L. (1992). A new theory of disuse and an old theory of stimulus fluctuation.From learning processes to cognitive processes: Essays in honor of Willian K. Estes.HealyA.KosslynS.ShffrinR.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.2, 35–67.
4.
BoutonM. E. (1984). Differential control by context in the inflation and reinstatement paradigms.Journal of Experimental Psychology: Animal Behavior Processes10, 56–74.
5.
BoutonM. E. (1988). Context and ambiguity in the extinction of emotional learning: Implications for exposure therapy.Behaviour Research & Therapy26, 137–149.
6.
BoutonM. E. (2002). Context, ambiguity, and unlearning: Sources of relapse after behavioral extinction.Biological Psychiatry52, 976–986.
7.
BoutonM. E.BollesR. C. (1979). Role of conditioned contextual stimuli in reinstatement of extinguished fear.Journal of Experimental Psychology: Animal Behavior Processes5, 368–378.
8.
BoutonM. E.PeckC. A. (1989). Context effects on conditioning extinction, and reinstatement in an appetitive conditioning preparation.Animal Learning & Behavior17, 188–198.
9.
BoutonM. E.RosengardC.AchenbachG. G.PeckC. A.BrooksD. C. (1993). Effects of contextual conditioning and unconditioned stimulus presentation on performance in appetitive conditioning.Quarterly Journal of Experimental Psychology46B, 63–95.
10.
BoutonM. E.SunsayC. (2003). Importance of trials versus accumulating time across trials in partially reinforced appetitive conditioning.Journal of Experimental Psychology: Animal Behavior Processes29, 62–77.
11.
BoutonM. E.WoodsA. M.MoodyE. W.SunsayC.Garcia-GutierrezA. (in press). Countering the context-dependence of extinction: Relapse and some tests of possible methods of relapse prevention.Fear and learning: Basic science to clinical application.CraskeM. G.HermansD.VansteenwegenD.Washington, DC: American Psychological Association.
12.
BrooksD. C.BoutonM. E. (1993). A retrieval cue for extinction attenuates spontaneous recovery.Journal of Experimental Psychology: Animal Behavior Processes19, 77–89.
13.
CainC. K.BlouinA. M.BaradM. (2003). Temporally massed CS presentations generate more fear extinction than spaced presentations.Journal of Experimental Psychology: Animal Behavior Processes29, 323–333.
14.
ChurchR. M.DelutyM. Z. (1977). Bisection of temporal intervals.Journal of Experimental Psychology: Animal Behavior Processes3, 216–228.
15.
DavisM. (1970). Effects of interstimulus interval length and variability on startle-response habituation in the rat.Journal of Comparative & Physiological Psychology72, 177–192.
16.
EstesW. K. (1955a). Statistical theory of distributional phenomena in learning.Psychological Review62, 369–377.
17.
EstesW. K. (1955b). Statistical theory of spontaneous recovery and regression.Psychological Review62, 145–153.
18.
GallistelC. R.GibbonJ. (2000). Time, rate, and conditioning.Psychological Review107, 289–344.
19.
GibbonJ.BalsamP. D. (1981). Spreading association in time.Autoshaping and conditioning theory.LocurtoC. M.TerraceH. S.GibbonJ.New York: Academic Press219–253.
20.
HoneyR. C. (1996). The temporal dynamics of a visual discrimination: The role of stimulus comparison and opponent processes.Journal of Experimental Psychology: Animal Behavior Processes22, 461–471.
21.
LangA. J.CraskeM. G.BjorkR. A. (1999). Implications of a new theory of disuse for the treatment of emotional disorders.Clinical Psychology—Science & Practice6, 80–94.
22.
MillerR. R.MatzelL. D. (1988). The comparator hypothesis: A response rule for the expression of associations.The psychology of learning and motivation: Advances in research and theory.BowerG. H.San Diego, CA: Academic Press22, 51–92.
23.
MillerR. R.SchachtmanT. R. (1985). The several roles of context at the time of retrieval.Context and learning.BalsamP. D.TomieA.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.167–194.
24.
MorrisR. W.FurlongT. M.WestbrookR. F. (2005). Recent exposure to a dangerous context impairs extinction and reinstates lost fear reactions.Journal of Experimental Psychology: Animal Behavior Processes31, 40–55.
25.
PavlovI. P. (1927). Conditioned reflexesOxford, UK: Oxford University Press.
26.
PearceJ. M.HallG. (1980). A model for Pavlovian conditioning: Variations in the effectiveness of conditioned but not unconditioned stimuli.Psychological Review87, 332–352.
27.
PearceJ. M.RedheadE. S.AydinA. (1997). Partial reinforcement in appetitive Pavlovian conditioning with rats.Quarterly Journal of Experimental Psychology50B, 273–294.
28.
RescorlaR. A. (2000). Extinction can be enhanced by a concurrent excitor.Journal of Experimental Psychology: Animal Behavior Processes26, 251–260.
29.
RescorlaR. A. (2001). Experimental extinction.Handbook of contemporary learning theories.MowrerR. R.KleinS. B.Mahwah, NJ: Lawrence Erlbaum Associates, Inc.119–154.
30.
RescorlaR. A. (2004). Spontaneous recovery.Learning & Memory11, 501–509.
31.
RescorlaR. A.DurlachP. J. (1987). The role of context in intertrial interval effects in autoshaping.Quarterly Journal of Experimental Psychology39B, 35–48.
32.
RescorlaR. A.HethC. D. (1975). Reinstatement of fear to an extinguished conditioned stimulus.Journal of Experimental Psychology: Animal Behavior Processes1, 88–96.
33.
RescorlaR. A.WagnerA. R. (1972). A theory of Pavlovian conditioning: Variations in the effectiveness of reinforcement and nonreinforcement.Classical conditioning II: Current research and theory.BlackA. H.ProkasyW. K.New York: Appleton-Century-Crofts.
34.
SunsayC.BoutonM. E. (2005). An investigation of the trial spacing effect in appetitive Pavlovian conditioning Manuscript in preparation.
35.
SunsayC.StetsonL.BoutonM. E. (2004). Memory priming and trial spacing effects in appetitive Pavlovian learning.Learning & Behavior32, 220–229.
36.
TerraceH. S.GibbonJ.FarrellL.BaldockM. D. (1975). Temporal factors influencing the acquisition and maintenance of an autoshaped keypeck.Animal Learning & Behavior3, 53–62.
37.
ThomasB. L.AyresJ. J. B. (2004). Use of the ABA renewal paradigm to assess the effects of extinction with co-present fear inhibitors or excitors: Implications for theories of extinction and for treating human fears and phobias.Learning and Motivation35, 22–51.
38.
TsaoJ. C. I.CraskeM. G. (2000). Timing of treatment and return of fear: Effects of massed uniform- and expanding-spaced exposure schedules.Behavior Therapy31, 137–147.
39.
WagnerA. R. (1976). Priming in STM: An information processing mechanism for self-generated or retrieval-generated depression in performance.Habituation: Perspectives from child development, animal behavior and neurophysiology.TigheT. J.LeatonR. N.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.95–128.
40.
WagnerA. R. (1978). Expectancies and the priming of STM.Cognitive aspects of animal behavior.HulseS. H.FowlerH.HoingW. K.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.
41.
WagnerA. R. (1981). SOP: A model of automatic memory processing in animal behavior.Information processing in animals: Memory mechanisms.SpearN. E.MillerR. R.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.5–47.
42.
WagnerA. R.BrandonS. E. (1989). Evolution of a structured connectionist model of Pavlovian conditioning (AESOP).Contemporary learning theories: Pavlovian conditioning and the status of traditional learning theory.KleinS. B.MowrerR. R.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.149–189.
43.
WagnerA. R.BrandonS. E. (2001). A componential theory of Pavlovian conditioning.Handbook of contemporary learning theories.MowrerR. R.KleinS. B.Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.23–64.
44.
WestbrookR. F.SmithF. J.CharnockD. J. (1985). The extinction of an aversion: Role of the interval between non-reinforced presentations of the averted stimulus.Quarterly Journal of Experimental Psychology37B, 255–273.
