attributions, deadlines, and children's intrinsic motivation
TRANSCRIPT
This article was downloaded by: [McMaster University]On: 25 November 2014, At: 14:40Publisher: RoutledgeInforma Ltd Registered in England and Wales Registered Number: 1072954Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH,UK
The Journal of GeneralPsychologyPublication details, including instructions forauthors and subscription information:http://www.tandfonline.com/loi/vgen20
Attributions, Deadlines, andChildren's Intrinsic MotivationStephen J. Dollinger a & Mark J. Reader aa Southern Illinois University , Carbondale , USAPublished online: 08 Aug 2013.
To cite this article: Stephen J. Dollinger & Mark J. Reader (1983) Attributions,Deadlines, and Children's Intrinsic Motivation, The Journal of General Psychology,109:2, 157-166, DOI: 10.1080/00221309.1983.10736082
To link to this article: http://dx.doi.org/10.1080/00221309.1983.10736082
PLEASE SCROLL DOWN FOR ARTICLE
Taylor & Francis makes every effort to ensure the accuracy of all theinformation (the “Content”) contained in the publications on our platform.However, Taylor & Francis, our agents, and our licensors make norepresentations or warranties whatsoever as to the accuracy, completeness,or suitability for any purpose of the Content. Any opinions and viewsexpressed in this publication are the opinions and views of the authors, andare not the views of or endorsed by Taylor & Francis. The accuracy of theContent should not be relied upon and should be independently verified withprimary sources of information. Taylor and Francis shall not be liable for anylosses, actions, claims, proceedings, demands, costs, expenses, damages,and other liabilities whatsoever or howsoever caused arising directly orindirectly in connection with, in relation to or arising out of the use of theContent.
This article may be used for research, teaching, and private study purposes.Any substantial or systematic reproduction, redistribution, reselling, loan,sub-licensing, systematic supply, or distribution in any form to anyone isexpressly forbidden. Terms & Conditions of access and use can be found athttp://www.tandfonline.com/page/terms-and-conditions
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
The Journal of General Psychology, 1983, 109,157-166.
ATTRIBUTIONS, DEADLINES, AND CHILDREN'S INTRINSICMOTIVATION*l
Southern Illinois University at Carbondale
STEPHEN J. DOLLINGER AND MARK J. READER
SUMMARY
This study assessed the effects of attribution statements and temporaldeadlines on preschoolers' intrinsic interest in puzzles. During a trainingphase, 39 5s completed puzzles under either the presence or absence ofdeadlines (instructions "to beat the timer"). They also heard E make eitherrelevant attributions ("I'll bet you like puzzles") or irrelevant attributionsafter they solved each puzzle. The two major findings of this study runcounter to attribution theory expectations. First, given the presence ofdeadlines, relevant attributions resulted in less subsequent intrinsic interestas compared to irrelevant attributions. Second, in the presence of irrelevantattributions, deadlines resulted in greater task interest when compared withno deadlines. It appears that, like rewards, deadlines may enhance taskinterest if they serve to engender self-perceptions of competence. Alternatively, it is conceivable that deadlines can enhance interest by their endogeneity to a task, or by providing proximal goals.
A. INTRODUCTION
The seemingly paradoxical effects of extrinsic constraints on intrinsicmotivation have attracted empirical interest, as well as controversy duringthe last 10 years [for recent reviews, see Condry (6), Deci and Ryan (7), andLepper and Greene (16)]. While major formulations of such phenomena(often termed "overjustification" after the overjustification hypothesis) arecouched in cognitive and attributional terms, very little direct evidencesupports the notion that attributions can mediate changes in intrinsic moti-
* Received in the Editorial Office, Provincetown, Massachusetts, on January 17, 1983.Copyright, 1983, by The Journal Press.
I Thanks are extended to Shirley Dunagan, Director of the Child Study Coop Nursery forher assistance in this project. Reprint requests should be sent to the first author at the addressshown at the end of this article.
157
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
158 JOURNAL OF GENERAL PSYCHOLOGY
vation. Instead, a substantial literature shows that indirect manipulations ofattributions (use of rewards, other constraints, or how a task is introduced)can at times detrimentally affect intrinsic interest in the activity. At the sametime, it is quite clear that direct attributional manipulations can influencechildren's behavior. Direct attributional manipulations consist of statementsto a child (or group of children) suggesting that he/she is the kind of childwho possesses a certain quality or behaves in a particular way. Researchershave shown that such manipulations can enhance children's cooperativeness, self-control, altruism, neatness, self-esteem, and achievement striving(10, 12, 17,22). One of these studies (17) found that an attributional manipulation could exceed the effectiveness of persuasion ("you should be . . ."messages), and equal or exceed the effects of reinforcement.
Two studies have provided evidence that attributions can causally influence interest in an activity. In one study, Kruglanski and his associates(14) compared the interest in games of two groups of children treatedidentically during the initial engagement in the games. However, for half ofthe children a retrospective misattribution was employed to lead 5s tobelieve (after the fact) that they engaged in the activity in order to earn aprize. This consisted of the false statement, "As we said before, (you) will beawarded special prizes ... " In a subsequent assessment, these researchersfound that children in this attribution condition expressed less enjoyment ofthe games than children who did not receive the attribution (nor a prize). Inanother study, Pittman and his colleagues (19) manipulated college student5s' interest in an activity via false physiological feedback. The 5s' galvanicskin responses were ostensibly monitored by the E while they performed avisual-motor game. At one point, some 5s were told that their GSR indicated increased interest in the task while, for others, GSR was attributed toincreased interest in a monetary reward. Generally consistent with expectations, the task-attribution resulted in a diminished overjustification effect,while the reward-attribution caused a slight augmentation of it.
Two other studies have provided less compelling results. In a study byDollinger (8), preschoolers were rewarded with tokens for solving puzzlesalthough only half of the children were led to expect that tokens could betraded in for prizes at the conclusion of the experiment. Crossed with thisfactor was the nature of E's attributions while giving tokens to the child.The E commented four times to the effect that the child must be quiteinterested in puzzles (task attribution) or in earning tokens (reward attribution). While subsequent interest was lower in the reward attribution condition, this effect occurred only in the prize-unexpected condition, a finding
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
STEPHEN J. DOLLINGER AND MARK J. READER 159
hard to explain by attribution theory. In the prize-expected condition, theresults were non significantly in the direction opposite to expectations. Inanother study, Reader and Dollinger (20) provided college student Ss withbogus personality feedback designed to lead them to believe that they wereintrinsically- or extrinsically-motivated persons (e.g., that they enjoyed "losing themselves in an activity" or "never lost sight of the goal"). In this study,a second manipulation (deadlines) affected subsequent intrinsic motivation,but the attributional manipulation had no effect. In view of the inconsistentresults across these four studies, the first purpose of the present research wasto provide a further test of the hypothesis that attributions can influencesubsequent intrinsic motivation.
The second purpose of this study was to assess the effects of deadlines onpreschoolers' intrinsic interest in an activity. Previous research with collegestudents has shown that, in keeping with attributional explanations, deadlines can reduce intrinsic motivation (1, 20). A replication of this effect withchildren provided the second impetus for this study.
B. METHOD
1. Subjects
The sample consisted of 20 boys and 19 girls attending a cooperativenursery school affiliated with a university psychology department. The agerange for both boys and girls was 3-6 to 5-4, with mean ages of 4-4 for boys,and 4-7 for girls. One additional boy (who was quite shy) refused to take partin the study. Younger children attended in the morning, and older childrenin the afternoon. Within sex/class combinations, children were randomlyassigned to the four experimental conditions created by the crossclassification of attributions (relevant or irrelevant) and deadlines (presentand absent). The Es were white male adults, one a faculty member and onea graduate student.
2. Pre-experiment Assessment
The primary activities used in this study were children's puzzles. Prior tothe experiment, the two nursery school teachers independently rated eachchild's interest in puzzles based on informal observations of their free-timeactivities over a three-week period. A three-point scale was used, withinstructions to rate children as falling in the upper 25%, middle 50%, orlower 25% in puzzle interest. The teachers agreed on their ratings of 28 ofthe 40 children (70%), with a contingency coefficient of .76 between the two
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
160 JOURNAL OF GENERAL PSYCHOLOGY
sets of ratings. For the main analyses, these ratings were summed. Themeasure was intended as a possible covariate for the primary dependentmeasures.
3. Procedure
During the first session of a two-part experiment, 5s individually accompanied one of the Es to the "surprise room" of the nursery school "to playwith some puzzles." Puzzles used during this training phase were adaptedfrom those of the McCarthy Scales of Children's Abilities. Upon beingseated, E described the task, and for half of the children presented a threeminute sand timer, demonstrating two or three times how it worked. Then 5was encouraged to "try to do the puzzle before the time is up-try to beat thetimer!" For deadline Ss, the timer was again turned over with each newpuzzle. For no-deadline Ss, the timer was never in view. Following puzzlecompletions, E said, "That's OK!" and for deadline 5s he added, "You beatthe timer." The E then stated one of four prearranged attribution statementsin an "offhand" conversational manner. Relevant attributions were as follows:
1. I'll bet you really like puzzles.2. It looks like you're a puzzle-lover.3. I'll bet you like puzzles more than most kids here.4. I can tell you really liked these puzzles.
Irrelevant attributions consisted of the following statements:1. I'll bet you really like ice cream.2. It looks like you're a --- lover. (Here E used 5's clothing and
appearance to comment on a likely interest.)3. I'll bet you like this school more than most kids here.4. I can tell you really liked being here today.
One prearranged attribution statement was used for each puzzle solved.When 5s failed a puzzle (typically by looking to E for help with a bewilderedexpression), Ss were given one or two subtle hints to help solve it. Whensuch puzzles were solved, attribution statements were made, but thesepuzzles were not included in the child's score for number-of-puzzles-solved.In addition to the number-solved, a second measure consisted of the solutiontime for the fourth puzzle which was successfully completed by all 5s.
The training phase concluded with a brief assessment of the 5's preferencefor more (or less) challenging puzzles. This measure was obtained becausepreference for challenging variants of a task is one aspect of intrinsicmotivation (9, 11). Children were shown four new puzzles on a different
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
STEPHEN j. DOLLINGER AND MARK]. READER 161
table, and were asked which they would like to do if they could do only oneand had as much time as they needed. The easiest puzzle (scored 1) had fivepieces; intermediate puzzles had nine and 17 pieces; and the hardest (scored4) had 22 pieces.
The assessment phase was conducted one week after the training phasewas completed. Ss were individually accompanied to a different researchroom (termed "the blue room") by a different E 2 to playa game called "MyFavorite Thing." The E in the assessment phase was blind to the S'scondition in the training phase. Upon arrival, S was shown the first of twotables each containing seven toys or activities. Each table contained twonew puzzles (one easy, one difficult) and five other activities includingmazes, crayons and paper, kaleidoscopes, a puppet, styrofoam airplanes,play money and jewelry, a magic slate, dot-to-dot pictures, plastic multicolored octagonal shapes, and a color-matching pegboard. After exploringthe activities on the first table, the S was asked to "pick your favoritething-the one you like the very best." This activity, ranked 1, was removedand the procedure was repeated until all seven activities were ranked. The Ethen conducted a consistency check by re-presenting the child's second- andsixth-ranked toys, and again asking for a preference. The entire procedurewas repeated for the seven toys on the second table. A summary score forpuzzle interest was derived by averaging the ranks assigned to the fourpuzzles on the two tables.
Ten of the 39 children reversed their choice on one of the two consistencychecks, and one of these children reversed her choice on both. Thesechildren were included in the main analyses, but were excluded in a supplementary analysis.
C. RESULTS
Teacher ratings, originally planned as a possible covariate, did not differacross the four treatment conditions and were essentially unrelated to meanpuzzle rank (r = .05), number-of-puzzles-solved (r = .23), solution time on
2 Both Es conducted the training phase with approximately equal numbers of children in thefour experimental conditions, with one testing the morning children and the other testingafternoon children. Es then reversed roles for the assessment phase. Hence, the identity of the Ewas confounded with class and, therefore, the age of the Ss. In the absence of additionalresearch personnel, this confound was deemed acceptable because it was highly desirable thatthe assessment phase E be different and, as far as possible, dissociated from the training phaseE for any given child. The mere presence of the assessment phase E during the training phasewould work against this purpose. Additionally, the confound was not considered criticalbecause there was no reason to expect age by treatment interactions for the age range studied.
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
162 JOURNAL OF GENERAL PSYCHOLOGY
the fourth training puzzle (r = - .13), or preferred difficulty level \r = .11).The main analyses, then, consisted of 2 x 2 (Attribution x Deadline) leastsquares analyses of variance (ANOVAs) for performance measures duringthe training phase and mean puzzle rank during the assessment phase.These analyses revealed nonsignificant main and interaction effects (all Fs <1) on the preferred difficulty level and number-solved measures. For thesolution time measure, a significant deadline main effect, F(1,35) == 4.97, P< .05, reflected faster solutions within the deadline than the no-deadlinecondition (Ms = 11.2 and 20.2 seconds, respectively). Because of heterogeneous variances on this measure, a supplementary analysis was done on logtransformed solution times, and this ,ANOVA revealed the same deadlinemain effect, F(l,35) = 5.86, P < .03.
The ANOVA for mean puzzle rank revealed nonsignificant main effects(both F < 1), and a significant Attribution x Deadline interaction, F(l,3S)= 7.21, P < .02. Means for this interaction are shown in Table 1. Simpleeffects tests revealed that children in the Irrelevant Attribution-Deadlinecondition showed greater puzzle interest (lower mean puzzle ranks) thanchildren in the Relevant Attribution-Deadline condition, F(l,3S) = 5.16, P< .05, and Irrelevant Attribution-No Deadline condition, F(l,3S) = 6.08,P < .05. When the 10 5s who "failed" the consistency check were excluded,
TABLE 1ATTRIBUTION X DEADLINE CELL MEANS
Relevant attributions Irrelevant attributions
Variable Deadline No deadline Deadline No deadline
Teacher ratingM 3.9 4.0 3.9 4.1SD 1.8 1.3 1.3 1.4
Number solvedM 3.6 3.2 3.6 3.4SD .7 1.3 .7 1.0
Solution time (sec)M 12.0 16.1 10.5 24.3SD 5.8 9.4 5.4 21.5
Difficulty preferenceM 1.3 1.8 1.5 1.4SD .7 1.0 1.1 1.0
Mean puzzle rankM 5.0 4.4 4.1 5.0SD .5 .6 1.3 0.9
Note: N = 9 for the Relevant attributions-Deadline cell, and N = 10 for all other cells.
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
STEPHEN J. DOLLINGER AND MARK J. READER 163
the means showed only slight changes and the ANOVA again revealed anAttribution X Deadline interaction, F(1,25) = 6.45, P < .02.
Two supplementary ANOVAs tested for possible interactions of experimental conditions with sex and class (morning vs afternoon). The firstANOVA (Attribution x Deadline x Sex) revealed the same effects justpresented, plus a significant sex main effect on teacher ratings of preexperiment puzzle interest, F(1,31) = 30.77, P :5 .0001. Girls were rated asmore interested in puzzles than were boys (Ms = 4.9 vs 3.1). No interactionsinvolving sex attained statistical significance. A second ANOVA (Attribution X Deadline X Class) revealed the same major findings, with nostatistically significant interactions involving the class variable. The onlysignificant main effect occurred for number-of-puzzles-solved during thetraining phase, F(1,31) = 10.79, P < .003. Children in the morning classsolved fewer puzzles than those in the afternoon class (Ms= 3.0 vs 3.9)Recalling that younger children attended in the morning, this finding parallels, and is probably explained by the finding that chronological age correlated significantly with number-solved, r = .52, P < .001.
D. DISCUSSION
The present results run counter to the expectations which gave rise to theexperiment. Among children in the irrelevant attributions (control) groups,the imposition of a deadline created greater subsequent task interest than theabsence of such deadlines. Additionally, for children in the deadline presentconditions, the introduction of relevant attributions (emphasizing the child'sinterest in puzzles) resulted in significantly less interest in puzzle activitiesthan the use of irrelevant attributions.
Why did deadlines serve to increase intrinsic interest? While our results donot offer a conclusive answer, we can speculate that the deadlines (aspresently employed) served to enhance the child's sense of competence atpuzzle-solving. It may be, then, that an)' extrinsic constraint can havepositive or negative effects on intrinsic motivation, depending in part on itseffect on self-perceived competence. Such effects have previously been documented with extrinsic rewards (3,5, 13,21). An additional assumption tothis line of reasoning, and one which might be tested, is that deadlines maynot engender perceptions of being controlled when used with preschoolersin contrast to their effect on adults (1). Given this assumption, the presentresults can be understood, at least in part, within Deci's cognitive evaluationtheory (7).
As an alternative explanation, it should be noted that some children's
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
164 JOURNAL OF GENERAL PSYCHOLOGY
visual-motor games have an inherent deadline component (e.g., "FindersKeepers" where one must match a shape to a standard before a ball bearingcompletes its roll down a runway). It is possible, then, that for somechildren's activities, deadlines may enhance interest via their endogeneity tothe activities [cf. Kruglanski et al. (15) regarding task-endogenous rewards].
Why did deadlines have a positive effect only within the irrelevant attribution condition, and (given a deadline) why did irrelevant attributionsproduce greater task interest than relevant attributions? Existing theories ofintrinsic motivation do not provide any obvious answers to these questions.At this point, our best guess is that the E's irrelevant attribution statementsconveyed greater interest in the child, while the relevant attributions mayhave implicated greater E interest in the puzzles. Since an E's ignoring of thechild can produce decrements in intrinsic motivation (2), it is possible that asubtle message of interest facilitated the child's interest in the experimentalactivity.
The present results might be considered in terms of a behavioral perspective. From this framework, the present deadline effect might be construed asan effect of goal-setting or externally-imposed criteria. However, it shouldbe noted that externally-imposed criteria have little or no influence onchildren's behavior, in the absence of rewards (18). Other behavioral explanations of the deadline and attribution effects might address the issue interms of increased stimulus control and reinforcement value of the E.However, such explanations would have to be considered weak on thegrounds that different Es conducted the two phases of the study, did so indifferent rooms, and that interest was measured with a preference-rankingformat rather than a behavioral assessment using free-play activity. Perhapsthe most promising account of the deadline effect is along the lines posed byBandura and Schunk (4) in terms of the distinction between proximal anddistal goals. Bandura and Schunk have argued that proximal goals increaseperformance, self-efficacy, and intrinsic: interest. Since the present deadlinewould have to be considered more proximal than distal, the results seem tooffer support for Bandura's position.
Finally, the present measure of intrinsic interest deserves a brief comment, since some readers may question its validity, particularly in view ofrecent findings by Wells and Schultz (23). These authors found that preschool children showed a discounting effect in their overt behavior (i.e.,actual task engagement) while parallel effects did not emerge in their predictions of how they would behave. While the present rank ordering methodappears similar to the Wells and Shultz prediction measure, it should be
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
STEPHEN J. DOLLINGER AND MARK J. READER 165
noted that the 5s were asked quite different questions: "which toy is yourfavorite thing-the one you like the very best" (in the present study) asagainst "which toy will you play with the most?" (to paraphrase Wells andShultz). Thus, we believe that the rank order measure used in the presentstudy required a simpler judgment by the child, and one more reflective ofintrinsic interest. Additionally, we should note that identical methods havebeen used successfully to investigate insufficient justification effects in theforbidden toy paradigm (cf. 16).
REFERENCES
1. AMABILE, T. M., DEJONG,W., & LEPPER, M. R Effects of externally-imposed deadlineson subsequent intrinsic motivation. J. Personal. & Soc. Psychol., 1976, 34,92-98.
2. ANDERSON, R, MANOOGIAN, S. T., & REZNICK, J. S. The undermining and enhancing ofintrinsic motivation in preschool children. J. Personal. & Soc. Psychol., 1976,34,915922.
3. ARKES, H. R Competence and the overjustification effect. Motiv. & Emot., 1979,3,143150.
4. BANDURA, A., & SCHUNK, D. H. Cultivating competence, self-efficacy, and intrinsicinterest through proximal self-motivation. 1. Personal. & Soc. Psychol., 1981,41,586598.
5. BOGGIANO, A. K., & RUBLE, D. N. Competence and the overjustification effect: Adevelopmental study. J. Personal. & Soc. Psychol., 1979,37, 1462-1468.
6. CONDRY, J. Enemies of exploration: Self-initiated versus other-initiated learning. 1.Personal. & Soc. Psychol., 1977,35,459-477.
7. DECI, E. L., & RYAN, R M. The empirical exploration of intrinsic motivational processes. In L. Berkowitz (Ed.), Advances in Experimental Social Psychology (Vol. 13).New York: Academic Press, 1980.
8. DOLLINGER, S. J. Extrinsic rewards, reward-associated messages, and intrinsic motivation. Cogn. Ther. & Res., 1979, 3,367-370.
9. DOLLINGER, S. J., & THELEN, M. H. Overjustification and children's intrinsic motivation: Comparative effects of four rewards. J. Personal. & Soc. Psychol., 1978,36,12591269.
10. GRUSEC, J. E., & REDLER, E. Attribution, reinforcement, and altruism: A developmentalanalysis. Devel. Psychol., 1980, 16,525-534.
11. HARTER, S., & ZIGLER, E. The assessment of effectance motivation in normal andretarded children. Devel. Psychol., 1974, 10, 169-180.
12. JENSEN, R E., & MOORE, S. G. The effect of attribute statements on cooperativeness andcompetitiveness in school-age boys. Child Deuel., 1977,48,305-307.
13. KARNIOL, R., & Ross, M. The effect of performance-relevant and performance-irrelevantrewards on children's intrinsic motivation. Child Deuel., 1977,48,482-487.
14. KRUGLANSKI, A. W., ALON, S., & LEWIS, T. Retrospective misattribution and taskenjoyment. J. Exper. Soc. Psycbol., 1972,8,493-501.
15. KRUGLANSKI, A. W., RITER, A., AMITAI, A., MARGOLIN, B. S., SHABTAI, L., & ZAKSH,D. Can money enhance intrinsic motivation? A test of the content-consequence hypothesis. J. Personal. & Soc. Psychol., 1975, 31,744-750.
16. LEPPER, M. R, & GREENE, D. Overjustification research and beyond: Toward a means-
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014
166 JOURNAL OF GENERAL PSYCHOLOGY
ends analysis of intrinsic and extrinsic motivation. In M. R. Lepper & D. Greene (Eds.),The Hidden Costs of Reward. Hillsdale, N]: Erlbaum, 1978.
17. MILLER, R. L., BRICKMAN, P., & BOLEN, D. Attribution versus persuasion as a meansfor modifying behavior. J. Personal. & Soc. Psychol., 1975, 31,430-441.
18. O'LEARY, S. G., & DUBEY, D. R. Applications of self-control procedures by children: Areview. J. Appl. Behav. Anal., 1979, 12,449-465.
19. PITTMAN, T. S., COOPER, E. E., & SMITH, T. W. Attribution of causality and theoverjustification effect. Personal. & Soc. Psychol. Bull., 1977, 3, 280-283.
20. READER, M. J., & DOLLINGER, S. J. Deadlines, self-perceptions, and intrinsic motivation. Personal. & Soc. Psychol. Bull., 1982,8,742-747.
21. ROSENFIELD, D., FOLGER, R., & ADELMAN, H. F. When rewards reflect competence: Aqualification of the overjustification effect. 1. Personal. & Soc. Psychol., 1980,39,368376.
22. TONER, I. J., MOORE, L. P., & EMMONS, B. A. The effect of being labeled on subsequentself-control in children. Child Devel., 1980, 51,618-621.
23. WELLS, D., & SCHULTZ, T. R. Developmental distinctions between behavior and judgment in the operation of the discounting principle. Child Devel., 1980, 51, 1307-1310.
Department of PsychologySouthern Illinois University at CarbondaleCarbondale, Illinois 62901
Dow
nloa
ded
by [
McM
aste
r U
nive
rsity
] at
14:
40 2
5 N
ovem
ber
2014