AzTrials
AzTrials

LearningNCT05910762

Human Learning of New Structured Information Across Time and Sleep

A study testing Associative inference, Category learning and Sleep in people with Learning and Humans, run by University of Pennsylvania at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

Acting adaptively requires quickly picking up on structure in the environment and storing the acquired knowledge for effective future use. Dominant theories of the hippocampus have focused on its ability to encode individual snapshots of experience, but the investigators and others have found evidence that it is also… Read more about this study

Who is it for?
Ages 18 to 35 yearsHealthy volunteers can take part
Conditions the study is for
Learning, Humans, Consolidation
What is being tested?
Associative inference, Category learning and Sleep
Could I receive a placebo?
No, everyone receives an active treatment
How many people
119 participants
Where
1 siteUnited States
Study dates
5 Jun 2023to 31 Jul 2026
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 35 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Between 18 and 35 years of age (all aims)
  • Not a member of a vulnerable population (all aims)
  • Normal or corrected-to-normal vision (all aims)
  • Normal hearing (all aims)
  • Able to speak English fluently (all aims)
  • No prior history of major psychiatric or neurological disorders (Aims 1 and 2; MRI-specific)
  • Not currently taking any antidepressants or sedatives (Aims 1 and 2; MRI-specific)
  • No known neurological disorders (Aim 3; EEG-specific)

Who cannot join

  • The investigators will exclude individuals with MR contraindications such as non-removable biomedical devices or metal in or on the body (Aims 1 and 2; MRI-specific)
  • Claustrophobia (Aims 1 and 2; MRI-specific)
  • Pregnant women will also be excluded from neuroimaging, as the effects of MR on pregnancy are not fully understood (Aims 1 and 2; MRI-specific)

Trial locations and contacts

1 site in 1 country.

United States1 site
  • University of Pennsylvania

    Philadelphia, Pennsylvania, 19104

Other trials in United States

About this study

Official title: Learning Novel Structure Across Time and Sleep

Acting adaptively requires quickly picking up on structure in the environment and storing the acquired knowledge for effective future use. Dominant theories of the hippocampus have focused on its ability to encode individual snapshots of experience, but the investigators and others have found evidence that it is also crucial for finding structure across experiences. The mechanisms of this essential form of learning have not been established. The investigators have developed a neural network model of the hippocampus instantiating the theory that one of its subfields can quickly encode structure using distributed representations, a powerful form of representation in which populations of neurons become responsive to multiple related features of the environment.

The first aim of this project is to test predictions of this model using high resolution functional magnetic resonance imaging (fMRI) in paradigms requiring integration of information across experiences. The results will clarify fundamental mechanisms of how humans learn novel structure, adjudicating between existing models of this process, and informing further model development. There are also competing theories as to the eventual fate of new hippocampal representations. One view posits that during sleep, the hippocampus replays recent information to build longer-term distributed representations in neocortex. Another view claims that memories are directly and independently formed and consolidated within the hippocampus and neocortex.

Read more

The second aim of this project is to test between these theories. The investigators will assess changes in hippocampal and cortical representations over time by re-scanning participants and tracking changes in memory at a one-week delay. Any observed changes in the brain and behavior across time, however, may be due to generic effects of time or to active processing during sleep.

The third aim is thus to assess the specific causal contributions of sleep to the consolidation of structured information. The investigators will use real-time sleep electroencephalography to play sound cues to bias memory reactivation. The investigators expect that this work will clarify the anatomical substrates and, critically, the nature of the representations that support encoding and consolidation of novel structure in the environment.

Being tested
Associative inference, Category learning, Sleep
Keywords
memory, sleep, learning

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Associative inferenceBehavioural

    Participants will engage in an associative inference paradigm. Memory will be assessed behaviorally and neural representations will be assessed using functional magnetic resonance imaging.

  • Category learningBehavioural

    Participants will engage in a category learning paradigm. Memory will be assessed behaviorally (Arms 2 and 3), and neural representations will be assessed using functional magnetic resonance imaging (Arm 2).

  • SleepBehavioural

    Participants will sleep after engaging in a category learning paradigm while electroencephalography data are collected, and memory will be assessed behaviorally after sleep.

Study groups in NCT05910762
Study groupRoleWhat they receive
Learning and consolidation in Associative InferenceExperimentalThe proposed functional magnetic resonance imaging study assesses the neural representations contributing to humans' ability to associate objects in the support of simple inferences and generalization. All participants will undergo the same procedure. Participants will learn about pairs of objects and then be asked to make judgments and inferences about the relationships between the objects. The order of presentation of the objects will be manipulated within subjects, as different learning theories make different predictions about how learning will unfold under different orderings. Participants will be brought back one week later for a second scan, to evaluate how the neural substrates of these processes change with consolidation.
Receives: Behavioral: Associative inference
Learning and consolidation in category learningExperimentalThe proposed functional magnetic resonance imaging study assesses the neural representations contributing to humans' ability to learn new categories of objects. All participants will undergo the same procedure. Participants will learn about novel objects, each with several colored parts. Some parts are unique to individual objects and others are shared among the members of the category. The investigators will assess how different regions of the brain contribute to learning and remembering these different kinds of parts, and how the resulting representations support category understanding. Participants will be brought back one week later for a second scan, to evaluate how the neural substrates of these processes change with consolidation.
Receives: Behavioral: Category learning
Manipulating replay during sleep using real-time EEGExperimentalIn the proposed electroencephalography (EEG) study, all participants will undergo the same procedure. Participants will learn the visual features and spoken names associated with three categories of novel objects. Participants' memory for these objects and the objects' parts will be tested before and after a nap. The investigators will monitor brain activity during the nap in real time and, at optimal moments, quietly play the spoken names of the objects to encourage reactivation of particular objects in particular orders. The investigators will assess how this manipulation impacts memory for these objects.
Receives: Behavioral: Category learning; Behavioral: Sleep

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Changes in multivariate representations

    Changes in spatial correlations between the MRI BOLD pattern associated with related objects over the course of learning and across the one-week delay.

    Measured: Within first session (spanning 2-3 hrs.) and at approximately one week delay in second session (spanning 1-2 hrs.)

  2. Brain-behavior correlations

    Correlations between BOLD signal in the brain and participant behavior during judgments about objects.

    Measured: Within first session (spanning 2-3 hrs.) and at approximately one week delay in second session (spanning 1-2 hrs.)

  3. Correlations between activity across brain regions

    Relationships between BOLD activity across different regions of the brain as a function of trial type and delay.

    Measured: Within first session (spanning 2-3 hrs.) and at approximately one week delay in second session (spanning 1-2 hrs.)

  4. Memory accuracy

    Change in generalization ability from before to after the nap as a function of the different conditions of object cueing during sleep.

    Measured: Within single study session (spanning 4-5 hrs.)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted20 Jun 2023
  2. Study start5 Jun 2023
  3. Primary completion31 Jul 2026
  4. Study completion31 Jul 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Basic science
Allocation
Randomised
Intervention model
Parallel groups
Masking
Single blind
Who is masked
Participant
Enrolment
119 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05910762
Sponsor's protocol ID
833228B
Other IDs
R01MH129436
Status last verified
Aug 2026
First submitted
10 May 2023
Last updated
20 Aug 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: All IPD that underlie results in a publication.

Publications

  • Schapiro AC, Kustner LV, Turk-Browne NB. Shaping of object representations in the human medial temporal lobe based on temporal regularities. Curr Biol. 2012 Sep 11;22(17):1622-7. doi: 10.1016/j.cub.2012.06.056. Epub 2012 Aug 9.

    PubMed 22885059
  • Schapiro AC, Turk-Browne NB, Norman KA, Botvinick MM. Statistical learning of temporal community structure in the hippocampus. Hippocampus. 2016 Jan;26(1):3-8. doi: 10.1002/hipo.22523. Epub 2015 Oct 13.

    PubMed 26332666
  • Schapiro AC, Gregory E, Landau B, McCloskey M, Turk-Browne NB. The necessity of the medial temporal lobe for statistical learning. J Cogn Neurosci. 2014 Aug;26(8):1736-47. doi: 10.1162/jocn_a_00578. Epub 2014 Jan 23.

    PubMed 24456393
  • Covington NV, Brown-Schmidt S, Duff MC. The Necessity of the Hippocampus for Statistical Learning. J Cogn Neurosci. 2018 May;30(5):680-697. doi: 10.1162/jocn_a_01228. Epub 2018 Jan 8.

    PubMed 29308986
  • Schlichting ML, Preston AR. Memory integration: neural mechanisms and implications for behavior. Curr Opin Behav Sci. 2015 Feb;1:1-8. doi: 10.1016/j.cobeha.2014.07.005.

    PubMed 25750931
  • Hinton, GE. Distributed representations. Technical Report CMU-CS-84-157. 1984.

  • McClelland JL, McNaughton BL, O'Reilly RC. Why there are complementary learning systems in the hippocampus and neocortex: insights from the successes and failures of connectionist models of learning and memory. Psychol Rev. 1995 Jul;102(3):419-457. doi: 10.1037/0033-295X.102.3.419.

    PubMed 7624455
  • Schapiro AC, Turk-Browne NB, Botvinick MM, Norman KA. Complementary learning systems within the hippocampus: a neural network modelling approach to reconciling episodic memory with statistical learning. Philos Trans R Soc Lond B Biol Sci. 2017 Jan 5;372(1711):20160049. doi: 10.1098/rstb.2016.0049.

    PubMed 27872368
  • Norman KA, O'Reilly RC. Modeling hippocampal and neocortical contributions to recognition memory: a complementary-learning-systems approach. Psychol Rev. 2003 Oct;110(4):611-46. doi: 10.1037/0033-295X.110.4.611.

    PubMed 14599236
  • Zhou Z, Singh D, Tandoc MC, Schapiro AC. Building integrated representations through interleaved learning. J Exp Psychol Gen. 2023 Sep;152(9):2666-2684. doi: 10.1037/xge0001415. Epub 2023 May 25.

    PubMed 37227843
  • Kumaran D, McClelland JL. Generalization through the recurrent interaction of episodic memories: a model of the hippocampal system. Psychol Rev. 2012 Jul;119(3):573-616. doi: 10.1037/a0028681.

    PubMed 22775499
  • Yonelinas AP, Ranganath C, Ekstrom AD, Wiltgen BJ. A contextual binding theory of episodic memory: systems consolidation reconsidered. Nat Rev Neurosci. 2019 Jun;20(6):364-375. doi: 10.1038/s41583-019-0150-4.

    PubMed 30872808
  • Schapiro AC, McDevitt EA, Chen L, Norman KA, Mednick SC, Rogers TT. Sleep Benefits Memory for Semantic Category Structure While Preserving Exemplar-Specific Information. Sci Rep. 2017 Nov 1;7(1):14869. doi: 10.1038/s41598-017-12884-5.

    PubMed 29093451
  • Schapiro AC, McDevitt EA, Rogers TT, Mednick SC, Norman KA. Human hippocampal replay during rest prioritizes weakly learned information and predicts memory performance. Nat Commun. 2018 Sep 25;9(1):3920. doi: 10.1038/s41467-018-06213-1.

    PubMed 30254219
  • Singh D, Norman KA, Schapiro AC. A model of autonomous interactions between hippocampus and neocortex driving sleep-dependent memory consolidation. Proc Natl Acad Sci U S A. 2022 Nov;119(44):e2123432119. doi: 10.1073/pnas.2123432119. Epub 2022 Oct 24.

    PubMed 36279437

Questions about this trial

What is this clinical trial studying?

A study testing Associative inference, Category learning and Sleep in people with Learning and Humans, run by University of Pennsylvania at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 8 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 20 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Changes in multivariate representations (time frame: Within first session (spanning 2-3 hrs.) and at approximately one week delay in second session (spanning 1-2 hrs.)). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05910762, which also lists 56 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 20 Aug 2026.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in