The bystander effect is well-documented in adults, but its developmental origins and underlying mechanisms in young children remain unclear. This study examined how bystander characteristics influence 5-year-olds’ prosocial decisions through three experiments with 247 young children (M = 5.00 years, SD = 0.58; 121 girls). Using a helping task paradigm in which young children chose between personal gain and helping others, we systematically manipulated three variables: the physical presence of bystanders (Experiment 1), their awareness of the dilemma (Experiment 2), and their perceived capability (Experiment 3). Results showed that the mere physical presence of bystanders did not significantly affect young children’s helping rates or response times. However, when bystanders were aware of the dilemma, young children’s helping decreased significantly compared to when bystanders were unaware. Critically, this effect was moderated by bystander capability: when high-capability bystanders were aware of the dilemma, young children’s helping rates were lowest and response times longest. These findings suggest that bystander effects in 5-year-olds are not driven by mere presence but by a dynamic assessment of responsibility distribution, contingent on perceptions of others’ awareness and capability. Young children appear to prioritize responsibility attribution over reputation concerns when deciding whether to help.
AielloJ. R.DouthittE. A. (2001). Social facilitation from Triplett to electronic performance monitoring. Group Dynamics Theory Research & Practice, 5(3), 163–180. https://doi.org/10.1037/1089–2699.5.3.163
2.
BarboraS.MichaelT.MalindaC. (2018). Communicative eye contact signals a commitment to cooperate for young children. Cognition, 179, 192–201. https://doi.org/10.1016/j.cognition.2018.06.010
3.
BarronG.YechiamE. (2002). Private e-mail requests and the diffusion of responsibility. Computers in Human Behavior, 18(5), 507–520. https://doi.org/10.1016/S0747–5632(02)00007–9
4.
Bar-TalD.RavivA.RavivA.Bar-TalY. (1982). Consistency of pupils’ attributions regarding success and failure. Journal of Educational Psychology, 74(1), 104–110. https://doi.org/10.1037/0022-0663.74.1.104
5.
BatesonM.NettleD.RobertsG. (2006). Cues of being watched enhance cooperation in a real-world setting. Biology Letters, 2(3), 412–414. https://doi.org/10.1098/rsbl.2006.0509
BickmanL. (1971). The effect of another bystander’s ability to help on bystander intervention in an emergency. Journal of Experimental Social Psychology, 7(3), 367–379. https://doi.org/10.1016/0022-1031(71)90035–7
8.
BryanC. J.MasterA.WaltonG. M. (2014). “Helping” versus “being a helper”: Invoking the self to increase helping in young children. Child Development, 85(5), 1836–1842. https://doi.org/10.1111/cdev.12244
9.
BuckleyN.SiegelL.NessS. (1979). Egocentrism, empathy, and altruistic behavior in young children. Developmental Psychology, 15, 329–330. https://doi.org/10.1037/0012–1649.15.3.329
10.
CañigueralR.HamiltonA. F. de C. (2019). Effects of being watched on self-referential processing, self-awareness and prosocial behaviour. Consciousness and Cognition, 76, 102830. https://doi.org/10.1016/j.concog.2019.102830
11.
ClarkR. D.WordL. E. (1972). Why don’t bystanders help? Because of ambiguity?Journal of Personality and Social Psychology, 24(3), 392–400. https://doi.org/10.1037/h0033717
12.
CramerR. E.McmasterM. R.BartellP. A.DragnaM. (1988). Subject competence and minimization of the bystander effect. Journal of Applied Social Psychology, 18(13), 1133–1148. https://doi.org/10.1111/j.1559-1816.1988.tb01198.x
13.
CritelliJ. W.KeithK. W. (2003). The bystander effect and the passive confederate: On the interaction between theory and method. Journal of Mind and Behavior, 24(3–4), 255–264. https://psycnet.apa.org/record/2004-11787-001
14.
DarleyJ. M.LatanéB. (1968). Bystander intervention in emergencies: Diffusion of responsibility. Journal of Personality and Social Psychology, 8(4), 377–383. https://doi.org/10.1037/h0025589
15.
DunfieldK. A. (2014). A construct divided: Prosocial behavior as helping, sharing, and comforting subtypes. Frontiers in Psychology, 5, Article 958. https://doi.org/10.3389/fpsyg.2014.00958
16.
EngelmannJ. M.HerrmannE.TomaselloM. (2012). Five-year-olds, but not chimpanzees, attempt to manage their reputations. PLOS ONE, 7(10), Article e48433. https://doi.org/10.1371/journal.pone.0048433
17.
EngelmannJ. M.HerrmannE.TomaselloM. (2018). Concern for group reputation increases prosociality in young children. Psychological Science, 29(2), 181–190. https://doi.org/10.1177/0956797617733830
18.
FarroniT.CsibraG.SimionF.JohnsonM. H. (2002). Eye contact detection in humans from birth. Proceedings of the National Academy of Sciences of the United States of America, 99(14), 9602–9605. https://doi.org/10.1073/pnas.152159999
19.
FaulF.ErdfelderE.LangA.-G.BuchnerA. (2007). G*Power 3: A flexible statistical power analysis program for the social, behavioral, and biomedical sciences. Behavior Research Methods, 39(2), 175–191. https://doi.org/10.3758/BF03193146
20.
FischerP.KruegerJ. I.GreitemeyerT.VogrincicC.KastenmüllerA.FreyD.. . . KainbacherM. (2011). The bystander-effect: A meta-analytic review on bystander intervention in dangerous and non-dangerous emergencies. Psychological Bulletin, 137(4), 517. https://doi.org/10.1037/a0023304
21.
GantiN.BaekS. (2021). Why people stand by: A comprehensive study about the bystander effect. Journal of Student Research, 10(1), 1–10. https://doi.org/10.47611/jsrhs.v10i1.1390
22.
GarciaS. M.WeaverK.MoskowitzG. B.DarleyJ. M. (2002). Crowded minds: The implicit bystander effect. Journal of Personality and Social Psychology, 83, 843–853. https://doi.org/10.1037/0022–3514.83.4.843
23.
GrueneisenS.WarnekenF. (2022). The development of prosocial behavior—from sympathy to strategy. Current Opinion in Psychology, 43, 323–328. https://doi.org/10.1016/j.copsyc.2021.08.005
24.
HamiltonA. F. D. C.LindF. (2016). Audience effects: What can they tell us about social neuroscience, theory of mind and autism?Culture and Brain, 4(2), 159–177. https://doi.org/10.1007/s40167–016–0044–5
25.
HarrisP. L.JohnsonC. N.HuttonD.AndrewsG.CookeT. (1989). Young children’s theory of mind and emotion. Cognition & Emotion, 3(4), 379–400. https://doi.org/10.1080/02699938908412713
26.
HavlikJ. L.SuganoY. Y. V.JacobiM. C.KukrejaR. R.JacobiJ. H. C.MasonP. (2020). The bystander effect in rats. Science Advances, 6(28), 4205. https://doi.org/10.1126/sciadv.abb4205
27.
HayD. F.PaineA. L.PerraO.CookK. V.FyfieldR. (2021). Prosocial and aggressive behavior: A longitudinal study. Monographs of the Society for Research in Child Development, 86(2), 7–103. https://doi.org/10.1111/mono.12427
28.
HoD. Y. F. (1996). Filial piety and its psychological consequences. In BondM. H. (Ed.), The handbook of Chinese psychology (pp. 155–165). Oxford University Press. https://psycnet.apa.org/record/1996-98234-011
29.
HortensiusR.De GelderB. (2014). The neural basis of the bystander effect — The influence of group size on neural activity when witnessing an emergency. Neuroimage, 93, 53–58. https://doi.org/10.1016/j.neuroimage.2014.02.025
30.
HortensiusR.De GelderB. (2018). From empathy to apathy: The bystander effect revisited. Current Directions in Psychological Science, 27(4), 249–256. https://doi.org/10.1177/0963721417749653
31.
HuangL. L. (2016). Interpersonal harmony and conflict for Chinese people: A yin-yang perspective. Frontiers in Psychology, 7, Article 847. https://doi.org/10.3389/fpsyg.2016.00847
32.
JungE. H.BhojwaniN. S. (2024). From observers to interveners: Examining bystander intentions in Facebook Live videos. International Journal of Human–Computer Interaction, 41(14), 8655–8665. https://doi.org/10.1080/10447318.2024.2413292
33.
KachelU.TomaselloM. (2018). 3- and 5-year-old children’s adherence to explicit and implicit joint commitments. Developmental Psychology, 55(1), 80–88. https://doi.org/10.1037/dev0000632
34.
KirschenbaumA. A.RapaportC. (2020). Helping behavior by bystanders: Contrasting individual vs social contextual factors. International Journal of Disaster Risk Reduction, 50, Article 101816. https://doi.org/10.1016/j.ijdrr.2020.101816
35.
LataneB.DarleyJ. M. (1968). Group inhibition of bystander intervention in emergencies. Journal of Personality and Social Psychology, 10(3), 215–221. https://doi.org/10.1037/h0026570
36.
LatanéB.NidaS. (1981). Ten years of research on group size and helping. Psychological Bulletin, 89, 308–324. https://doi.org/10.1037/0033–2909.89.2.308
37.
LearyM. R.KowalskiR. M. (1990). Impression management: A literature review and two-component model. Psychological Bulletin, 107(1), 34–47. https://doi.org/10.1037/0033-2909.107.1.34
38.
LeimgruberK. L.ShawA.SantosL. R.OlsonK. R. (2012). Young children are more generous when others are aware of their actions. PLOS ONE, 7(10), Article e48292. https://doi.org/10.1371/journal.pone.0048292
39.
LevineM.ProsserA.EvansD.ReicherS. (2005). Identity and emergency intervention: How social group membership and inclusiveness of group boundaries shape helping behavior. Personality and Social Psychology Bulletin, 31(4), 443. https://doi.org/10.1177/0146167204271651
40.
LiebstL. S.PhilpotR.BernascoW.DauselK. L.Ejbye-ErnstP.NicolaisenM. H.LindegaardM. R. (2019). Social relations and presence of others predict bystander intervention: Evidence from violent incidents captured on CCTV. Aggressive Behavior, 45(6), 598–609. https://doi.org/10.1002/ab.21853
41.
LutzD. J.KeilF. C. (2002). Early understanding of the division of cognitive labor. Child Development, 73(4),1073–1084. https://doi.org/10.1111/1467-8624.00458
42.
LevineM.CrowtherS. (2008). The responsive bystander: How social group membership and group size can encourage as well as inhibit bystander intervention. Journal of Personality and Social Psychology, 95(6), 1429–1439. https://doi.org/10.1037/a0012634
43.
National Bureau of Statistics of China. (2022). China statistical yearbook 2022. China Statistics Press. https://www.stats.gov.cn/
44.
NobreG. C.ValentiniN. C. (2019). Self-perception of competence: Concept, changes in childhood, and gender and age-group differences. Journal of Physical Education, 30(1), Article e3008. https://doi.org/10.4025/jphyseduc.v30i1.3008
45.
PasquiniE. S.CorriveauK. H.KoenigM.HarrisP. L. (2007). Preschoolers monitor the relative accuracy of informants. Developmental Psychology, 43(5), 1216–1226. https://doi.org/10.1037/0012-1649.43.5.1216
46.
PhilpotR.LiebstL. S.LevineM.BernascoW.LindegaardM. R. (2020). Would I be helped? Cross-National CCTV footage shows that intervention is the norm in public conflicts. American Psychologist, 75(1), 66–75. https://doi.org/10.1037/amp0000469
47.
PlötnerM.OverH.CarpenterM.TomaselloM. (2015). The effects of collaboration and minimal-group membership on children’s prosocial behavior, liking, affiliation, and trust. Journal of Experimental Child Psychology, 139, 161–173. https://doi.org/10.1016/j.jecp.2015.05.008
48.
SenjuA.JohnsonM. H. (2009). The eye contact effect: Mechanisms and development. Trends in Cognitive Sciences, 13(3), 127–134. https://doi.org/10.1016/j.tics.2008.11.009
49.
ShawA.MontinariN.PiovesanM.OlsonK. R.GinoF.NortonM. I. (2014). Children develop a veil of fairness. Journal of Experimental Psychology: General, 143, 363–375. https://doi.org/10.1037/a0031247
50.
SierksmaJ.ShuttsK. (2021). Competence-based helping: Children’s consideration of need when providing others with help. Journal of Experimental Child Psychology, 210, 105206. https://doi.org/10.1016/j.jecp.2021.105206
51.
SiposovaB.GrueneisenS.HelmingK.TomaselloM.CarpenterM. (2021). Common knowledge that help is needed increases helping behavior in children. Journal of Experimental Child Psychology, 201, 104973. https://doi.org/10.1016/j.jecp.2020.104973
52.
SprafkinJ. N.LiebertR. M.PoulosR. W. (1975). Effects of a prosocial televised example on children’s helping. Journal of Experimental Child Psychology, 20(1), 119–126. https://doi.org/10.1016/0022-0965(75)90031–4
53.
StaubE. (1970). A child in distress: The influence of age and number of witnesses on children’s attempts to help. Journal of Personality and Social Psychology, 14(2), 130–140. https://doi.org/10.1037/h0028752
VaishA.CarpenterM.TomaselloM. (2010). Young children selectively avoid helping people with harmful intentions. Child Development, 81(6), 1661–1669. https://doi.org/10.1111/j.1467-8624.2010.01500.x
56.
Van CleemputK.VandeboschH.PabianS. (2014). Personal characteristics and contextual factors that determine “helping,” “joining in,” and “doing nothing” when witnessing cyberbullying. Aggressive Behavior, 40(5), 383–396. https://doi.org/10.1002/ab.21534
57.
VanderBorghtM.JaswalV. K. (2009). Who knows best? Preschoolers sometimes prefer child informants over adult informants. Infant and Child Development, 18(1), 61–71. https://doi.org/10.1002/icd.591
58.
WarnekenF.TomaselloM. (2006). Altruistic helping in human infants and young chimpanzees. Science, 311(5765), 1301–1303. https://doi.org/10.1126/science.1121448
59.
WarnekenF.TomaselloM. (2013). The emergence of contingent reciprocity in young children. Journal of Experimental Child Psychology, 116(2), 338–350. https://doi.org/10.1016/j.jecp.2013.06.002
60.
WatanabeD.YuzawaM. (2013). Perception of one’s own and others’ ability by preschool Japanese children. Japanese Psychological Research, 55(4), 303–314. https://doi.org/10.1111/jpr.12022
