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  1. Article: Frontal midline theta transcranial alternating current stimulation enhances early consolidation of episodic memory.

    Shtoots, Limor / Nadler, Asher / Partouche, Roni / Sharir, Dorin / Rothstein, Aryeh / Shati, Liran / Levy, Daniel A

    NPJ science of learning

    2024  Volume 9, Issue 1, Page(s) 8

    Abstract: Evidence implicating theta rhythms in declarative memory encoding and retrieval, together with the notion that both retrieval and consolidation involve memory reinstatement or replay, suggests that post-learning theta rhythm modulation can promote early ... ...

    Abstract Evidence implicating theta rhythms in declarative memory encoding and retrieval, together with the notion that both retrieval and consolidation involve memory reinstatement or replay, suggests that post-learning theta rhythm modulation can promote early consolidation of newly formed memories. Building on earlier work employing theta neurofeedback, we examined whether theta-frequency transcranial alternating stimulation (tACS) can engender effective consolidation of newly formed episodic memories, compared with beta frequency stimulation or sham control conditions. We compared midline frontal and posterior parietal theta stimulation montages and examined whether benefits to memory of theta upregulation are attributable to consolidation rather than to retrieval processes by using a washout period to eliminate tACS after-effects between stimulation and memory assessment. Four groups of participants viewed object pictures followed by a free recall test during three study-test cycles. They then engaged in tACS (frontal theta montage/parietal theta montage/frontal beta montage/sham) for a period of 20 min, followed by a 2-h break. Free recall assessments were conducted after the break, 24 h later, and 7 days later. Frontal midline theta-tACS induced significant off-line retrieval gains at all assessment time points relative to all other conditions. This indicates that theta upregulation provides optimal conditions for the consolidation of episodic memory, independent of mental-state strategies.
    Language English
    Publishing date 2024-02-16
    Publishing country England
    Document type Journal Article
    ISSN 2056-7936
    ISSN 2056-7936
    DOI 10.1038/s41539-024-00222-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Effects of Theta EEG Neurofeedback on the Consolidation of Spatial Memory.

    Shtoots, Limor / Dagan, Tom / Levine, Josh / Rothstein, Aryeh / Shati, Liran / Levy, Daniel A

    Clinical EEG and neuroscience

    2020  Volume 52, Issue 5, Page(s) 338–344

    Abstract: How can the stability of a recently acquired memory be improved? Recent findings regarding the importance of theta frequency EEG activity in the hippocampus suggest that entraining neural activity in that frequency band might increase post-encoding ... ...

    Abstract How can the stability of a recently acquired memory be improved? Recent findings regarding the importance of theta frequency EEG activity in the hippocampus suggest that entraining neural activity in that frequency band might increase post-encoding waking replay, reinforcing learning-related plasticity. Our previous studies revealed that upregulating postlearning theta power using EEG neurofeedback (NFB) significantly benefitted procedural and episodic memory performance (both immediate and delayed), and may provide optimal conditions for stabilization of new memories. We have now explored whether memory benefits of theta NFB generalize to delayed spatial memory, an additional hippocampus-dependent process. Participants learned to associate object images with locations on a computer screen. NFB was used to enable participants to selectively increase scalp EEG theta power for 30 minutes. Visuo-spatial memory was tested one week later, with the theta NFB participants compared with 2 control groups (beta-augmentation NFB as an active control group, and an additional passive control group that did not engage in NFB). Theta upregulation was found to improve visuo-spatial memory, as reflected in reduced error distances in location marking and faster reaction time for correct answers by the theta group. This supports the contention that theta upregulation immediately after learning strengthens early consolidation of visuo-spatial memory. This intervention could potentially benefit various memory-challenged populations, as well as healthy individuals.
    MeSH term(s) Electroencephalography ; Humans ; Neurofeedback ; Reaction Time ; Spatial Memory ; Theta Rhythm
    Language English
    Publishing date 2020-11-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2140201-2
    ISSN 2169-5202 ; 0009-9155 ; 1550-0594
    ISSN (online) 2169-5202
    ISSN 0009-9155 ; 1550-0594
    DOI 10.1177/1550059420973107
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Juvenile stress leads to long-term immunological metaplasticity-like effects on inflammatory responses in adulthood.

    Shtoots, Limor / Richter-Levin, Gal / Hugeri, Ofer / Anunu, Rachel

    Neurobiology of learning and memory

    2017  Volume 154, Page(s) 12–21

    Abstract: Previous studies indicate that individuals exposed to stress in juvenility are more prone to suffer from stress-related psychopathologies in adulthood. Evidence suggests that exposure to enriched environment (EE) conditions alleviates juvenile stress ( ... ...

    Abstract Previous studies indicate that individuals exposed to stress in juvenility are more prone to suffer from stress-related psychopathologies in adulthood. Evidence suggests that exposure to enriched environment (EE) conditions alleviates juvenile stress (JVS) effects. Exposure to stress has been found to affect immune responses to challenges, but whether JVS has long-term effects on inflammatory processes remains unclear. Here, we examined the impact of JVS on inflammatory processes in adulthood, and the effects of exposure to EE conditions. Adult rats exposed to JVS showed elevated levels of blood monocytes after induction of peritoneal inflammation. This was associated with higher concentration of blood chemokine ligand type 2 (CCL2), but lower levels of its receptor, chemokine receptor type 2 (CCR2) on these monocytes, indicating reduced ability of these monocytes to be recruited to the inflammatory site. In accordance, JVS led to reduced levels of recruited macrophages at the peritoneal cavity, as well as a reduced activation ratio for the release of peritoneal interleukin-10 (IL-10) by lipopolysaccharide (LPS) activation. EE conditions, which fully reversed the anxiety-like behavior resulting from exposure to JVS, did not reverse JVS-induced alterations in blood concentration of monocytes or peritoneal macrophages, but affected IL-10 activation ratio. This effect was associated with a compensatory elevation of the peritoneal CCL2-CCR2 axis. Our results demonstrate long-term metaplasticity-like effects of JVS, which alter inflammatory processes in response to immune challenges in adulthood. Our results also raise the possibility that EE does not simply reverse the effects of JVS but rather indirectly modulates its impact.
    MeSH term(s) Age Factors ; Animals ; Anxiety/etiology ; Anxiety/immunology ; Inflammation/complications ; Inflammation/immunology ; Interleukin-10/immunology ; Lipopolysaccharides/administration & dosage ; Macrophages/immunology ; Male ; Monocytes/immunology ; Rats, Sprague-Dawley ; Stress, Psychological/complications ; Stress, Psychological/immunology
    Chemical Substances Lipopolysaccharides ; Interleukin-10 (130068-27-8)
    Language English
    Publishing date 2017-09-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1223366-3
    ISSN 1095-9564 ; 1074-7427
    ISSN (online) 1095-9564
    ISSN 1074-7427
    DOI 10.1016/j.nlm.2017.09.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Enhancing early consolidation of human episodic memory by theta EEG neurofeedback.

    Rozengurt, Roman / Shtoots, Limor / Sheriff, Aviv / Sadka, Ofir / Levy, Daniel A

    Neurobiology of learning and memory

    2017  Volume 145, Page(s) 165–171

    Abstract: Consolidation of newly formed memories is readily disrupted, but can it be enhanced? Given the prominent role of hippocampal theta oscillations in memory formation and retrieval, we hypothesized that upregulating theta power during early stages of ... ...

    Abstract Consolidation of newly formed memories is readily disrupted, but can it be enhanced? Given the prominent role of hippocampal theta oscillations in memory formation and retrieval, we hypothesized that upregulating theta power during early stages of consolidation might benefit memory stability and persistence. We used EEG neurofeedback to enable participants to selectively increase theta power in their EEG spectra following episodic memory encoding, while other participants engaged in low beta-focused neurofeedback or passively viewed a neutral nature movie. Free recall assessments immediately following the interventions, 24h later and 7d later all indicated benefit to memory of theta neurofeedback, relative to low beta neurofeedback or passive movie-viewing control conditions. The degree of benefit to memory was correlated with the extent of theta power modulation, but not with other spectral changes. Theta enhancement may provide optimal conditions for stabilization of new hippocampus-dependent memories.
    MeSH term(s) Adult ; Brain/physiology ; Electroencephalography ; Female ; Humans ; Male ; Memory Consolidation/physiology ; Memory, Episodic ; Mental Recall/physiology ; Neurofeedback ; Theta Rhythm
    Language English
    Publishing date 2017-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1223366-3
    ISSN 1095-9564 ; 1074-7427
    ISSN (online) 1095-9564
    ISSN 1074-7427
    DOI 10.1016/j.nlm.2017.10.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 2339: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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