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view source for hippocampus wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for hippocampus add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide hippocampus you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page role in memory see also amnesia epigenetics in learning and memory the hallmark function of the hippocampus is the formation of explicit memory also known as declarative memory ref name morris and amaral2024a episodic memory and semantic memory are the two components of explicit memory ref name huang cite journal vauthors huang cc rolls et hsu ch feng j lin cp title extensive cortical connectivity of the human hippocampal memory system beyond the what and where dual stream model journal cereb cortex volume 31 issue 10 pages 4652 4669 date august 2021 pmid 34013342 pmc 8866812 doi 10 1093 cercor bhab113 url ref the hippocampus also encodes emotional context from the amygdala this is partly why returning to a location where an emotional event occurred may evoke that emotion there is a deep emotional connection between episodic memories and places ref cite book title learning and memory from brain to behavior edition second vauthors gluck m mercado e myers c publisher kevin feyen year 2014 isbn 978 1 4292 4014 7 location new york page 416 ref due to bilateral symmetry the brain has a hippocampus in each cerebral hemisphere if damage to the hippocampus occurs in only one hemisphere leaving the structure intact in the other hemisphere the brain can retain near normal memory functioning ref cite journal vauthors di gennaro g grammaldo lg quarato pp esposito v mascia a sparano a meldolesi gn picardi a title severe amnesia following bilateral medial temporal lobe damage occurring on two distinct occasions journal neurological sciences volume 27 issue 2 pages 129 133 date june 2006 pmid 16816912 doi 10 1007 s10072 006 0614 y s2cid 7741607 ref severe damage to the hippocampi in both hemispheres results in profound difficulties in forming new memories anterograde amnesia and often also affects memories formed before the damage occurred retrograde amnesia although the retrograde effect normally extends many years back before the brain damage in some cases older memories remain this retention of older memories leads to the idea that memory consolidation consolidation over time involves the transfer of memories out of the hippocampus to other parts of the brain ref name squireschacter cite book vauthors squire lr schacter dl title the neuropsychology of memory year 2002 publisher guilford press ref refsquire2002 ref rp ch 1 experiments using intrahippocampal transplantation of hippocampal cells in primates with neurotoxic lesions of the hippocampus have shown that the hippocampus is required for the formation and recall but not the storage of memories ref name pmid10581225 cite journal vauthors virley d ridley rm sinden jd kershaw tr harland s rashid t french s sowinski p gray ja lantos pl hodges h title primary ca1 and conditionally immortal mhp36 cell grafts restore conditional discrimination learning and recall in marmosets after excitotoxic lesions of the hippocampal ca1 field journal brain volume 122 issue 12 pages 2321 2335 date december 1999 pmid 10581225 doi 10 1093 brain 122 12 2321 doi access free ref it has been shown that a decrease in the volume of various parts of the hippocampus leads to specific memory impairments in particular efficiency of verbal memory retention is related to the anterior parts of the right and left hippocampus the right head of the hippocampus is more involved in executive functions and regulation during verbal memory recall the tail of the left hippocampus tends to be closely related to verbal memory capacity ref name sozinova 2008 cite journal vauthors sozinova ev kozlovskiy sa vartanov av skvortsova vb pirogov ya anisimov nv kupriyanov da date september 2008 title the role of hippocampal parts in verbal memory and activation processes journal international journal of psychophysiology volume 69 issue 3 page 312 doi 10 1016 j ijpsycho 2008 05 328 ref damage to the hippocampus does not affect some types of memory such as the ability to learn new skills playing a musical instrument or solving certain types of puzzles for example this fact suggests that such abilities depend on different types of memory such as procedural memory in implicit memory function implicating different brain regions furthermore amnesic patients frequently show implicit memory for experiences even in the absence of conscious knowledge for example patients asked to guess which of two faces they have seen most recently may give the correct answer most of the time in spite of stating that they have never seen either of the faces before some researchers distinguish between conscious recollection which depends on the hippocampus and familiarity which depends on portions of the medial temporal lobe ref cite journal vauthors diana ra yonelinas ap ranganath c title imaging recollection and familiarity in the medial temporal lobe a three component model journal trends in cognitive sciences volume 11 issue 9 pages 379 386 date september 2007 pmid 17707683 doi 10 1016 j tics 2007 08 001 ref refdiana2007 s2cid 1443998 ref a study claims to have confirmed that the hippocampus is not associated with implicit memory ref name steinkrauss cite journal vauthors steinkrauss ac slotnick sd title is implicit memory associated with the hippocampus journal cogn neurosci volume 15 issue 2 pages 56 70 date april 2024 pmid 38368598 doi 10 1080 17588928 2024 2315816 url ref but other sources say the question is still up for debate as of 2024 ref name slotnik cite journal vauthors slotnick sd title the hippocampus and implicit memory journal cogn neurosci volume 15 issue 2 pages 25 26 date april 2024 pmid 38767113 doi 10 1080 17588928 2024 2354706 url ref when rats are exposed to an intense learning event they may retain a life long memory of the event even after a single training session the memory of such an event appears to be first stored in the hippocampus but this storage is transient much of the long term storage of the memory seems to take place in the anterior cingulate cortex ref cite journal vauthors frankland pw bontempi b talton le kaczmarek l silva aj title the involvement of the anterior cingulate cortex in remote contextual fear memory journal science volume 304 issue 5672 pages 881 883 date may 2004 pmid 15131309 doi 10 1126 science 1094804 s2cid 15893863 bibcode 2004sci 304 881f ref when such an intense learning event was experimentally applied more than 5 000 differentially methylated region differently methylated dna regions appeared in the hippocampus neuron al genome of the rats at one hour and at 24 hours after training ref cite journal vauthors duke cg kennedy aj gavin cf day jj sweatt jd title experience dependent epigenomic reorganization in the hippocampus journal learning memory volume 24 issue 7 pages 278 288 date july 2017 pmid 28620075 pmc 5473107 doi 10 1101 lm 045112 117 ref these alterations in dna methylation methylation pattern occurred at many gene s that were downregulation and upregulation down regulated often due to the formation of new 5 methylcytosine sites in cpg site cpg rich regions of the genome furthermore many other genes were downregulation and upregulation upregulated likely often due to the dna demethylation removal of methyl groups from previously existing 5 methylcytosine s 5mcs in dna demethylation of 5mc can be carried out by several proteins acting in concert including tet enzymes ref name rasmussen_2016 cite journal vauthors rasmussen kd helin k title role of tet enzymes in dna methylation development and cancer journal genes development volume 30 issue 7 pages 733 750 date april 2016 pmid 27036965 pmc 4826392 doi 10 1101 gad 276568 115 ref ref name melamed_2018 cite journal vauthors melamed p yosefzon y david c tsukerman a pnueli l title tet enzymes variants and differential effects on function journal frontiers in cell and developmental biology volume 6 issue article number 22 date 2018 pmid 29556496 doi 10 3389 fcell 2018 00022 doi access free pmc 5844914 ref as well as enzymes of the dna base excision repair pathway ref name drohat_2016 cite journal vauthors drohat ac coey ct title role of base excision repair enzymes in erasing epigenetic marks from dna journal chemical reviews volume 116 issue 20 pages 12711 12729 date october 2016 pmid 27501078 pmc 5299066 doi 10 1021 acs chemrev 6b00191 ref between systems model the between systems memory interference model describes the inhibition of non hippocampal systems of memory during concurrent hippocampal activity ref name packard_2013 cite journal vauthors packard mg goodman j title factors that influence the relative use of multiple memory systems journal hippocampus volume 23 issue 11 pages 1044 1052 date november 2013 pmid 23929809 doi 10 1002 hipo 22178 ref specifically it was found that when the hippocampus was inactive non hippocampal systems located elsewhere in the brain were found to memory consolidation consolidate memory in its place however when the hippocampus was reactivated engram neuropsychology memory traces consolidated by non hippocampal systems were not recalled suggesting that the hippocampus interferes with long term memory consolidation in other memory related systems ref cite journal vauthors sparks ft lehmann h sutherland rj title between systems memory interference during retrieval journal the european journal of neuroscience volume 34 issue 5 pages 780 786 date september 2011 pmid 21896061 doi 10 1111 j 1460 9568 2011 07796 x s2cid 25745773 ref one of the major implications that this model illustrates is the dominant effects of the hippocampus on non hippocampal networks when information is incongruent with this information in mind future directions could lead towards the study of these non hippocampal memory systems through hippocampal inactivation further expanding the labile constructs of memory additionally many theories of memory are holistically based around the hippocampus this model could add beneficial information to hippocampal research and memory theories such as the multiple trace theory ref name moscovitch_2005 cite journal vauthors moscovitch m rosenbaum rs gilboa a addis dr westmacott r grady c mcandrews mp levine b black s winocur g nadel l title functional neuroanatomy of remote episodic semantic and spatial memory a unified account based on multiple trace theory journal journal of anatomy volume 207 issue 1 pages 35 66 date july 2005 pmid 16011544 pmc 1571502 doi 10 1111 j 1469 7580 2005 00421 x department review ref ref name moscovitch_2024 cite book vauthors moscovitch m gilboa a chapter systems consolidation transformation and reorganization multiple trace theory trace transformation theory and their competitors veditors kahana mj wagner ad title the oxford handbook of human memory two volume pack foundations and applications publisher oxford university press date june 2024 isbn 978 0 19 091798 2 doi 10 1093 oxfordhb 9780190917982 013 43 department review ref lastly the between system memory interference model allows researchers to evaluate their results on a systems neuroscience multiple systems model suggesting that some effects may not be simply mediated by one portion of the brain ref name ferbinteanu_2019 cite journal vauthors ferbinteanu j title memory systems 2018 towards a new paradigm journal neurobiology of learning and memory volume 157 issue pages 61 78 date january 2019 pmid 30439565 pmc 6389412 doi 10 1016 j nlm 2018 11 005 department review ref return to hippocampus retrieved from https en wikipedia org wiki hippocampus privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for hippocampus add languages add topic