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1	Hippocampal ensembles represent sequential relationships among an extended sequence of nonspatial events.
	Shahbaba, Babak; Li, Lingge; Agostinelli, Forest; Saraf, Mansi; Cooper, Keiland W; Haghverdian, Derenik; Elias, Gabriel A; Baldi, Pierre; Fortin, Norbert J
	In: Nature communications, vol 13, iss 1 (2022)
	Abstract: The hippocampus is critical to the temporal organization of our experiences. Although this fundamental capacity is conserved across modalities and species, its underlying neuronal mechanisms remain unclear. Here we recorded hippocampal activity as rats remembered an extended sequence of nonspatial events unfolding over several seconds, as in daily life episodes in humans. We then developed statistical machine learning methods to analyze the ensemble activity and discovered forms of sequential organization and coding important for order memory judgments. Specifically, we found that hippocampal ensembles provide significant temporal coding throughout nonspatial event sequences, differentiate distinct types of task-critical information sequentially within events, and exhibit theta-associated reactivation of the sequential relationships among events. We also demonstrate that nonspatial event representations are sequentially organized within individual theta cycles and precess across successive cycles. These findings suggest a fundamental function of the hippocampal network is to encode, preserve, and predict the sequential order of experiences.
	Keyword: 2.1 Biological and endogenous factors; Acoustic Stimulation; Animal; Animals; Auditory Perception; Electrodes; Hippocampus; Implanted; Machine Learning; Male; Memory; Mental Health; Models; Nerve Net; Neurosciences; Odorants; Olfactory Perception; Rats; Stereotaxic Techniques; Time Factors
	URL: https://escholarship.org/uc/item/16m8r8hj
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2	Participation of the classical speech areas in auditory long-term memory.
	Karabanov, AN; Paine, R; Chao, CC...
	In: PLoS One , 10 (3) , Article e0119472. (2015) (2015)
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3	Does tonality boost short-term memory in congenital amusia?
	Albouy, P; Schulze, K; Caclin, A...
	In: Brain Res , 1537 224 - 232. (2013) (2013)
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4	Auditory stroop and absolute pitch: an fMRI study.
	Schulze, K; Mueller, K; Koelsch, S
	In: Hum Brain Mapp , 34 (7) 1579 - 1590. (2013) (2013)
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5	Accent processing in dementia.
	Hailstone, JC; Ridgway, GR; Bartlett, JW...
	In: Neuropsychologia , 50 (9) 2233 - 2244. (2012) (2012)
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6	Test of a motor theory of long-term auditory memory.
	Schulze, K; Vargha-Khadem, F; Mishkin, M
	In: Proc Natl Acad Sci U S A , 109 (18) 7121 - 7125. (2012) (2012)
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7	Do irrelevant sounds impair the maintenance of all characteristics of speech in memory?
	Gabriel, Damien; Gaudrain, E; Lebrun-Guillaud, G...
	In: ISSN: 0090-6905 ; Journal of Psycholinguistic Research, Vol. 41, No 6 (2012) pp. 475-86 (2012)
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8	Auditory short-term memory capacity correlates with gray matter density in the left posterior STS in cognitively normal and dyslexic adults.
	Richardson, FM; Ramsden, S; Ellis, C...
	In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2011)
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9	Evolution of non-speech sound memory in postlingual deafness: implications for cochlear implant rehabilitation
	Lazard, D S; Giraud Mamessier, Anne-Lise; Truy, E...
	In: ISSN: 0028-3932 ; Neuropsychologia, Vol. 49, No 9 (2011) pp. 2475-82 (2011)
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10	Functional architecture of verbal and tonal working memory: an FMRI study.
	Koelsch, S; Schulze, K; Sammler, D...
	In: Hum Brain Mapp , 30 (3) 859 - 873. (2009) (2009)
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11	Duration of auditory sensory memory in parents of children with SLI: a mismatch negativity study.
	Barry, JG; Hardiman, MJ; Line, E...
	In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2008)
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12	Visual encoding differentially affects auditory event-related potentials during working memory retrieval.
	Golob, Edward J; Starr, Arnold
	In: Psychophysiology, vol 41, iss 2 (2004)
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13	Posterior cingulate cortex activation by emotional words: fMRI evidence from a valence decision task.
	Maddock, Richard J; Garrett, Amy S; Buonocore, Michael H
	In: Human brain mapping, vol 18, iss 1 (2003)
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14	Developmental dissociation between visual and auditory repetition priming: the role of input lexicons
	Carlesimo, G; Vicari, S; Albertoni, A. - 2000
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15	Attentional but not pre-attentive neural measures of auditory discrimination are atypical in children with developmental language disorder.
	Kornilov, Sergey A (authoraut); Grigorenko, Elena L (authoraut); Fang, Shin-Yi (authoraut).
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