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Collective memory is the shared pool of knowledge and information in the memories of two or more members of a social group. The English phrase "collective memory" and the equivalent French phrase "la mémoire collective" appeared in the second half of the nineteenth century. The philosopher and sociologist Maurice Halbwachs analyzed and advanced the concept of the collective memory in the book La mémoire collective (1950). Collective memory can be shared, passed on, and constructed, by large and small social groups. Examples of these groups could include a government or popular culture, among others. Collective memory parallels the memory of a person who is better at recalling images than words; but also exhibits key differences and features, such as cross-cueing.
Groups remember more than individuals, as groups are able to draw on the knowledge and experience (memories) of all individuals present. An example of this is an article written by Norman Brown that incorporated a few experiments testing individual inaccuracies. The first experiment had 15 subjects estimate the month and year of 36 random events some political and non-political. The events ranged from January 1976 to May 1983. They were instructed to think out loud and would be prompted if they fell silent for more than a couple of seconds. One prediction made during the experiment was that participants would frequently justify their responses with reference to one or more auxiliary facts. This experiment yielded that only accurate responses concerning the correct month and year happened 8% of the time. Most of the participants (78%) used auxiliary facts to date events.
The second experiment used 40 different events 20 being political and 20 being non-political. The 24 four year undergraduates from the University of Chicago were asked to tell if the event happened during the Carter or Reagan presidency. Then they were asked if the event happened while they were in high school or college. As a side experiment participants were given a reward for answering each question correctly in less than 10 seconds. This trial was done twice for each person. Obviously the second time answers were more accurate and faster. Participants as a whole were able to answer political events faster when deciding which president was in office and were able to answer non-political events faster with high school or college.
The third experiment consisted of participants using free-association and a knowledge-assessment phase. The 30 students were asked to write down the first current event they could think of related to the shown high-knowledge political event, low-knowledge political event, high-knowledge non-political event, and the low-knowledge non-political event. High-knowledge events had higher same narrative responses (44%) from the participants. Another example would be members of a group planning a tactical strike against another country are likely to come to a better decision when they work together, rather than alone. One member may be knowledgeable about the terrain and morale of the troops in the country where the strike is planned, while another may be knowledgeable about the home country's weaponry, and another may be knowledgeable about the home country's military morale.
Akin to this example, when students are permitted to take examinations as a group, they usually outperform individuals, as each member of the group is knowledgeable in different areas.
Groups are also able to acquire more information than individuals. As individuals often have widely differing experiences, backgrounds, personalities, etc., each can acquire a unique set of information that can be contributed to a group discussion.
Free-riding and Social loafing. Group members do not remember as much as they have the capacity to remember, as group members engage in free-riding and social loafing. When group members realize – be it implicitly or explicitly – that others will aid in the recall of information, they will put less effort into processing and storing the information. In some situations, these inadequacies in collective memory may be so great that groups are unable to recall previously-made decisions without the aid of a written record (group minutes).
Collaborative Inhibition When groups collaborate to share information, they experience collaborative inhibition, a decrease in performance compared to the memory performance of individuals. Basden, Basden, Bryner, and Thomas (1997) provided evidence that retrieval interference underlies collaborative inhibition, as hearing other members' thoughts and discussion about the topic at hand interferes with one's own organization of thoughts and impairs memory. Additionally, motivational mechanisms may also account for this memory deficit in groups due to social loafing. Explanations for this include:
- Personal accountability is diminished, as individual contributions are less recognizable in a group.
- There is a perceived dispensability of effort – individuals believe that their contribution will not make a difference in the end.
- Individuals may try to create an equity of effort, in that they will try to match the effort exerted by other group members. By nature this output is low, however, as each member must wait for everyone to take their turn.
- Diffusion of responsibility: individuals think they are less accountable for group behaviour versus their own behaviour.
However, it has been found that collective inhibition may be due to sources other than social loafing, as offering a monetary incentive have been evidenced to fail to produce an increase in memory for groups. Further evidence from this study suggest something other than social loafing is at work, as reducing evaluation apprehension – the focus on one's performance amongst other people – assisted in individuals' memories but did not produce a gain in memory for groups. Personal accountability – drawing attention to one's own performance and contribution in a group – also did not reduce collaborative inhibition. Therefore, group members' motivation to overcome the interference of group recall cannot be achieved by several motivational factors.
Despite the problem of collaborative inhibition, working in groups may benefit an individual's memory in the long run, as group discussion exposes one to many different ideas over time. Working alone initially prior to collaboration seems to be the optimal way to increase memory.
Cross-cueing Information exchange among group members often helps individuals to remember things that they would not have remembered had they been working alone. In other words, the information provided by Person A may 'cue' memories in Person B. This phenomenon results in enhanced recall.
Synchronization of memories (from dyads to networks). Bottom-up approaches to the formation of collective memories investigate how cognitive-level phenomena allow for people to synchronize their memories following conversational remembering. Due to the malleability of human memory, talking with one another about the past results in memory changes that increase the similarity between the interactional partners' memories  When these dyadic interactions occur in a social network, one can understand how large communities converge on a similar memory of the past. 
The collective memory of a nation is represented in part by the memorials it chooses to erect. Public memory is enshrined in memorials from the Holocaust memorial in Berlin to the Vietnam Veterans Memorial in Washington DC. Whatever a nation chooses to memorialize in physical monument, or perhaps more significantly, what not to memorialize, is an indicator of the collective memory.
Collective memory is also sustained through a continuous production of representational forms. In the media age – and maybe particularly during the last decade of increasing digitization – this generates a flow of, and production of, second hand memories (see James E. Young below). Particular narratives and images are reproduced and reframed, yet also questioned and contested through new images and so forth. Collective memory today differs much from the collective memories of an oral culture, where no printing technique or transportation contributed to the production of imagined communities (see Imagined Communities) where we come to share a sense of heritage and commonality with many human beings we have never met – as in the manner a citizen may feel a sort of 'kinship' with people of his nation, region or city.
The concept of collective memory, initially developed by Halbwachs, has been explored and expanded from various angles – a few of these are introduced below.
James E. Young has introduced the notion of 'collected memory' (opposed to collective memory), marking memory's inherently fragmented, collected and individual character, while Jan Assmann develops the notion of 'communicative memory', a variety of collective memory based on everyday communication. This form of memory is similar to the exchanges in an oral culture or the memories collected (and made collective) through oral history. As another subform of collective memories Assmann mentions forms detached from the everyday, it can be particular materialized and fixed points as, e.g. texts and monuments.
The theory of collective memory was also discussed by former Hiroshima resident and atomic bomb survivor, Kiyoshi Tanimoto, in his tour of the United States as an attempt to rally support and funding for the reconstruction of his Memorial Methodist Church in Hiroshima. He theorized that the use of the atomic bomb had forever been added to the world's collective memory and would serve in the future as a warning against such devices. See John Hersey's Hiroshima novel.
The idea was also discussed more recently in The Celestine Prophecy and subsequent novels written by James Redfield as a continuing process leading to the eventual transcendence of this plane of existence. The idea that a futuristic development of the collective unconscious and collective memories of society allowing for a medium with which one can transcend ones existence is an idea expressed in certain variations of new age religions.
Relationship to music and film
This notion of collective memory overflows into the music and film world. Certain references and songs have permeated through culture and invoke certain reactions in a wide social group. This makes it easy to make references to these scenes and songs, knowing that a large audience will recognize and understand them without further explanation. Soundtracks have been instrumental to cinema and television as a subtler form of expression and identity.
Music, and more specifically soundtracks, can be utilized as an outlet for hope, possibility and resistance for everyday people. In Time Passages, George Lipsitz acknowledged that “dominant ideology triumphed on television in the 1950s, just as it did in political and social life” (Lipsitz, 67).  However, recently movies and television shows like Insecure, Super Fly, Waiting to Exhale, and more, have been able to incorporate music to spread “other” culture and foster a community feel. The music not only grounds itself in time but also helps personify the complex characters. The combination of new and classic songs helps promote these ideals.
Sharing music and exchanging songs and in turn facilitating a collective memory also connects a person to their larger community. In Record and Hold, Jose Van Dijck looked at how this “Shared listening, exchanging songs, and talking about music create a sense of belonging, and connect a person’s sense of self to a larger community and generation” (Van Dijck, 357).  The same song can elicit different memories and emotions from different people – but they remain a sign of their time and location. Collective memory highlights the power of television and popular culture to influence politics and offer a glimpse into other people’s social realities. The music incorporated in popular television and film culture can also play a role in young people’s development of their identities. Van Dijck wrote, “Recorded music also has a formative function: young people in particular construct their identities while figuring out their musical taste” (Van Dijck 359). Television and movies can have just as big of an impact on cultural identities as any history book.
In mass media
The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject. (December 2010) (Learn how and when to remove this template message)
The arrival of film created many images, film scenes, news scenes, photographs, quotes, and songs, which became very familiar to regular moviegoers and remained in their collective memory. Images of particular movie stars became part of collective memory. During cinema visits, people could watch newsreels of news stories from around the world. For the first time in history a mass audience was able to view certain stories, events, and scenes, all at the same time. They could all view how for instance the Hindenburg disaster was caught on camera and see and remember these scenes all at once.
When television became a global mass entertainment medium in the 1950s and 1960s the collective memory of former cinema visitors increased when various films could be repeated endlessly and worldwide on television broadcasts. For example, old films like The Wizard of Oz, King Kong and cartoons like the Looney Tunes and Tom and Jerry have been shown internationally and remained on television, through syndication. Hereby particular film scenes have become well-known, even to people who had not seen these films on their original cinematic release. The same applies for television shows like I Love Lucy which have been repeated so often over the decades that certain episodes and scenes have become ingrained in the public's collective memory.
When newsreels in the cinema gradually made place for television news broadcasting, it became a habit for mass audiences to watch the daily news on television. Worldwide this led to a new kind of collective memory where various news events could be shown much quicker than with the cinema News Reels. Therefore, certain filmed news stories could be shown on the same day they happened and even live during the broadcast itself. Millions of people have viewed the assassination of John F. Kennedy in 1963, the landing of Apollo 11 in 1969, the Wedding of Prince Charles and Princess Diana (1981), the death of Princess Diana, and the September 11 attacks on their television. In fact, certain questions like "What were you doing when.... happened?", usually referring to a large, heavily mediatized event, have become a very important question in the history of the development of the collective memory.
Many people can remember what they were doing when certain internationally big media events occurred and these type of questions are usually used as a sort of milestone in individual people's life. For example, "What were you doing when you heard that John Lennon was shot?". Due to television repeats, these moments could be relived even long after the actual event happened. The introduction of video stores and video recorders in the 1980s, the internet in the 1990s and the DVD player and YouTube in the 2000s even increased the opportunity to view and check out famous and infamous movie and TV scenes.
Thanks to all these innovations certain scenes have become part of audiences' collective memory. This makes it easy for journalists, comedians, advertisers, politicians, etc. to make references to these scenes, knowing that a large audience will recognise and understand them without further explanation. For example, when president Ronald Reagan concluded a speech on March 13, 1985 against the increase of taxes he said "Make my day". Most people in the audience and TV viewers understood the reference to the Clint Eastwood film Sudden Impact and laughed and cheered as a consequence of that. The dance moves from Michael Jackson's music video for "Thriller" have been repeatedly shown on TV so much that they are instantly recognizable and therefore imitated frequently for comedic effect in films, TV shows, commercials, etc.
Whenever a comedy show or film features a scene where someone is killed or threatened in a shower, most people understand it as a parody of Psycho. Various cartoons from Bugs Bunny to Shrek have spoofed famous fairy tales, knowing that everybody is familiar with the original stories and will immediately laugh at every deviation. The roar of movie monster Godzilla and Johnny Weissmuller's Tarzan yell have become instantly recognizable and easy to put into a context, even without the images.
Numerous TV shows and films such as The Simpsons, Family Guy, Scary Movie, the Shrek films, and the films of Mel Brooks, have referenced, parodied, imitated and recreated these famous scenes, often to the point of overkill. Certain observers, like Kenneth Tynan in a quote from his diaries from October 19, 1975 have noted that due to the heavy rotation and repeats of all these famous film scenes, often even without their original context, they have become part of the cultural consciousness. He wrote: "Nobody took into account the tremendous impact that would be made by the fact that films are permanent and easily accessible from childhood onward. As the sheer number of films piles up, their influence will increase, until we have a civilization entirely molded by cinematic values and behavior patterns." (Quoted from Tynan, Kenneth, The Diaries of Kenneth Tynan, Bloomsbury, 2001, page 66).
The influence of television scenes on collective memory has been noticeable with children who are able to quote lines and songs from commercials, films and television shows they have watched regularly. Some young children who have watched a large amount of television have been known to react in an unnatural way to certain situations, comparable with overacting, because they recreate scenes they remember seeing in similar situations on television. There have been cases reported of people who've compared their own life too much with the romanticized, idealized life depicted in films and television series. They try to recreate the happy families and perfect love relationships they remember seeing on television or in movies.
Not all scenes that were once collective memory are remembered as well today. Certain shows, commercials and films that were popular in one decade are shown less frequently on television in the next. Thus, certain scenes do not rest in the collective memory of the next generation. Many references in old Bugs Bunny cartoons to Hollywood stars and radio shows who were famous in the 1940s, are almost obscure to modern viewers. On the other hand, certain scenes have remained in the collective memory, due to being constantly repeated in other media and are well known even for those unfamiliar with the original. For example, even people who never saw the film King Kong know that there is a scene in which the large ape climbs the Empire State Building with a human girl in his hand. This could be a negative side effect of the multi-referential nature films and television shows.
Younger audiences, unfamiliar with the original subject being referenced in a contemporary film or TV series, do not recognize the reference and assume that, for instance a Twilight Zone plot reference in The Simpsons has been thought up by the creators of The Simpsons instead of the other way around. In some cases, references or parodies of older movies in contemporary films and TV shows are almost comparable to plagiarism since they just mimic or imitate a famous scene frame-by-frame instead of adding a funny new element.
In a more general and global perspective, the work of Jeffrey Andrew Barash emphasizes the ways in which the mass media select, articulate and transmit reported events and thus endow them with public significance. Mass media representation of communicated events configures them in accord with spatio-temporal patterns and a logic that are not simple replicas of the order of everyday experience, since disseminated information is charged with an autonomous symbolic sense through which public awareness is channeled and sedimented in collective memory. This autonomous symbolic sense draws its potency from an uncanny ability to simulate direct experience while dissimulating the gap which separates it from the immediate life world in which it originates. The potency of the mass media format appears in a particularly clear light in examples such as the televised Romanian revolution, media representation of the Balkan wars, and the mediatized O. J. Simpson trial in the United States
- Collective consciousness
- Collective intelligence, Distributed cognition
- Collective unconscious
- Digital preservation, Web archiving
- Les Lieux de Mémoire
- National memory
- Selective omission – biases to taboo some elements of a collective memory.
- Memory consolidation
- Haim Weinberg (2014). "The Paradox of Internet Groups: Alone in the Presence of Virtual Others", p 143. ISBN 1-7818-1252-7.
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- Coman, A.; Manier, D.; Hirst, W. (2009). "Forgetting the unforgettable through conversation: socially shared retrieval-induced forgetting of September 11 memories". Psychological Science. 20 (5): 627–633.
- Coman, A.; Momennejad, I.; Drach, R.; Geana, A. (2016). "Mnemonic convergence in social networks: The emergent properties of cognition at a collective level". PNAS. 113 (29): 8171–8176.
- Assmann, Jan (2008). A. Erll & A. Nünning, ed. "Communicative and cultural memory". Cultural Memory Studies: An International and Interdisciplinary Handbook: 109–118.
- Lipsitz, George (1990). Time Passages: Collective Memory and American Popular Culture.
- Van Dijck, Jose. "Record and Hold: Popular Music between personal and collective memory".
- Jeffrey Andrew Barash, Collective Memory and the Historical Past, p. 114-167
- Jan Assmann: Religion and Cultural Memory: Ten Studies, Stanford UP 2005
- Jeffrey Andrew Barash, Collective Memory and the Historical Past, Chicago and London, University of Chicago Press, 2016.
- Maurice Halbwachs: On Collective Memory, Univ of Chicago Press, 1992, ISBN 0-226-11596-8
- Pennebaker, James W. Paez, Dario. Rime, Bernard: Collective memory of political events : social psychological perspectives, Mahwah, New Jersey. Lawrence Erlbaum Associates: 1997.
- Amy Corning & Howard Schuman: Generations and Collective Memory, Chicago: University of Chicago Press, 2015. ISBN 9780226282527
- Bayer, Yaakov M. (2016). Memory and belonging: The social construction of a collective memory during the intercultural transition of immigrants from Argentina in Israel. Journal of Multidisciplinary Research, 8(1), 5-27.
- Sorek, Tamir (2015). Palestinian Commemoration in Israel: Calendars, Monuments, and Martyrs. Stanford, CA: Stanford University Press. ISBN 9780804795180.
- Olick, Jeffrey K.: The Politics of Regret: On Collective Memory and Historical Responsibility, Routledge, 2007
- Fitsch, Matthias: The Promise of Memory: History and Politics in Marx, Benjamin, and Derrida, State University of New York Press, 2006
- Olick, Jeffrey K.: In the House of the Hangman: The Agonies of German Defeat,1943-1949, University of Chicago Press, 2005.
- Cole, Jennifer: Forget colonialism? : sacrifice and the art of memory in Madagascar, Berkeley [etc.] : Univ. of California Press, 2001 
- Lipsitz, George: Time Passages : Collective Memory and American Popular Culture, Minneapolis. University of Minnesota Press: 2001.
- Neal, Arthur G.: National Trauma and Collective Memory: Major Events in the American Century. Armonk, N.Y. M.E. Sharpe: 1998
- Olick, Jeffrey K., Vered Vinitzky-Seroussi, and Daniel Levy, eds. The Collective Memory Reader. Oxford University Press: 2011.
- Prucha, Francis Paul. Handbook for Research in American History: A Guide to Bibliographies and Other Reference Works. University of Nebraska Press: 1987
- Encyclopedia of American Social History. Ed. Mary Clayton et al. 3 vols. New York: Scribner, 1993.
- Blazek, Ron and Perrault, Anna. United States History: A Selective Guide to Information Sources. Englewood, Colorado. Libraries Unlimited: 1994
- Erll, Astrid and Nünning, Ansgar. A Companion to Cultural Memory Studies. Walter De Gruyter. 2010.
- Au Yeung, Ching Man and Jatowt, Adam: Studying How the Past is Remembered: Towards Computational History through Large Scale Text Mining, Proceedings of the 20th ACM Conference on Information and Knowledge Management (CIKM 2011), ACM Press 
- Sumikawa, Y., Jatowt, A & Düring, M: Analysis of Temporal and Web Site References in History-related Tweets, Proceedings of the 2017 ACM on Web Science Conference, WebSci 2017, Troy, NY, USA, ACM Press 
Coman, A. (2015). The psychology of collective memory. In: James D. Wright (editor-in-chief), International Encyclopedia of the Social & Behavioral Sciences (2nd Ed.), Vol. 4, Oxford: Elsevier. pp. 188–193.
Coman, A. & Momennejad, I, Geana, A, Drach, D.R. (2016). Mnemonic convergence in social networks: the emergent properties of cognition at a collective level. Proceedings of National Academy of Sciences, 113 (29), 8171-8176.
Hirst W., Manier D. (2008). Towards a psychology of collective memory. Memory, 16, 183–200.
Hirst, W., Yamashiro, J., Coman, A. (2018). Collective memory from a psychological perspective. Trends in Cognitive Sciences, 22 (5), 438-451.
Licata, Laurent and Mercy, Aurélie: Collective memory (Social psychology of), International Encyclopedia of the Social & Behavioral Sciences, 2nd edition. Elsevier. 2015.
- For a Sociology of Collective Memory short discussion with bibliography of French works by Marie-Claire Lavabre, Research Director at CNRS – Centre Marc Bloch (CEVIPOF)
- Interdisciplinary Study of Memory Site by John Sutton, Philosophy Department, Macquarie University, Sydney. Links to many bibliographies
- "History in the Public Sphere: Analyzing Collective Memory" course by Harold Marcuse, History Department, University of California, Santa Barbara. With bibliography and links to readings.