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arxiv: 2504.15965 · v2 · submitted 2025-04-22 · 💻 cs.IR

Recognition: no theorem link

From Human Memory to AI Memory: A Survey on Memory Mechanisms in the Era of LLMs

Yaxiong Wu , Sheng Liang , Chen Zhang , Yichao Wang , Yongyue Zhang , Huifeng Guo , Ruiming Tang , Yong Liu
Authors on Pith no claims yet

Pith reviewed 2026-05-17 11:00 UTC · model grok-4.3

classification 💻 cs.IR
keywords memory mechanismslarge language modelshuman memoryAI memoryLLM surveycategorization frameworkmemory dimensions
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The pith

This survey connects categories of human memory to memory in LLM-based AI systems and introduces a three-dimension eight-quadrant framework to organize the field.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines how memory functions in humans, including different types like episodic and semantic memory, and draws parallels to how AI systems store and retrieve information from interactions. It then reviews existing research on memory in large language models and proposes a structured way to categorize this work using three key dimensions: the object of memory, its form, and the time aspect. These dimensions create eight distinct quadrants for classification. The goal is to use insights from human memory to guide the development of more advanced memory capabilities in AI. The survey concludes by discussing current limitations in AI memory and potential paths forward for improvement in the era of LLMs.

Core claim

By conducting a detailed analysis of human memory categories and relating them directly to the memory of AI systems, and by systematically organizing existing memory-related work into a categorization based on three dimensions of object, form, and time that results in eight quadrants, this survey provides a comprehensive view that can inspire the construction of more powerful memory mechanisms for LLM-driven AI systems.

What carries the argument

The three dimensions of object, form, and time, which divide memory mechanisms into eight quadrants, serving as the organizing framework that links human memory insights to AI memory implementations.

Load-bearing premise

That analyzing human memory categories and mapping them to AI memory, along with the proposed three-dimension eight-quadrant categorization, will lead to actionable insights for building improved memory mechanisms in large language models.

What would settle it

An experiment showing that LLM memory designs based on this human memory mapping and quadrant categorization do not outperform existing ad-hoc approaches in retaining and using past information effectively.

read the original abstract

Memory is the process of encoding, storing, and retrieving information, allowing humans to retain experiences, knowledge, skills, and facts over time, and serving as the foundation for growth and effective interaction with the world. It plays a crucial role in shaping our identity, making decisions, learning from past experiences, building relationships, and adapting to changes. In the era of large language models (LLMs), memory refers to the ability of an AI system to retain, recall, and use information from past interactions to improve future responses and interactions. Although previous research and reviews have provided detailed descriptions of memory mechanisms, there is still a lack of a systematic review that summarizes and analyzes the relationship between the memory of LLM-driven AI systems and human memory, as well as how we can be inspired by human memory to construct more powerful memory systems. To achieve this, in this paper, we propose a comprehensive survey on the memory of LLM-driven AI systems. In particular, we first conduct a detailed analysis of the categories of human memory and relate them to the memory of AI systems. Second, we systematically organize existing memory-related work and propose a categorization method based on three dimensions (object, form, and time) and eight quadrants. Finally, we illustrate some open problems regarding the memory of current AI systems and outline possible future directions for memory in the era of large language models.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript surveys memory mechanisms in LLM-driven AI systems. It first analyzes categories of human memory (episodic, semantic, procedural, short-term, long-term) and relates them to AI memory components such as context windows, parametric knowledge, RAG, and external stores. It then organizes existing literature via a proposed three-dimension (object, form, time) eight-quadrant taxonomy and concludes with open problems and future directions for memory design inspired by human cognition.

Significance. If the taxonomy proves robust and the human-to-AI mapping yields design guidance beyond existing enumerations of context extension and retrieval methods, the survey could help structure research on persistent, adaptive memory in LLMs. The explicit bridging of cognitive categories to engineered mechanisms is a potential strength, provided the framework demonstrates independence of dimensions and identifies implementable improvements.

major comments (2)
  1. [Abstract and §2] Abstract and §2 (human memory analysis): the direct mapping of human categories (e.g., episodic memory) onto LLM mechanisms (e.g., context windows or external vector stores) is presented as inspirational without addressing core mismatches in consolidation and interference mechanisms; this mapping is load-bearing for the claim that human memory can guide construction of more powerful AI systems.
  2. [§3] §3 (proposed categorization): the assertion that the three dimensions (object, form, time) are sufficiently independent to generate eight meaningful quadrants lacks explicit justification or empirical check for orthogonality; if form is largely determined by object or time in current LLM architectures (parametric vs. retrieval-based), the scheme reduces to fewer effective dimensions and undermines the organizational contribution.
minor comments (2)
  1. [Introduction] The literature search protocol, databases, and inclusion/exclusion criteria are not stated, which is required for a systematic survey to allow assessment of coverage and bias.
  2. [§3] Figure or table illustrating the eight quadrants would improve clarity; currently the dimensions are described only textually.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed feedback. We address each major comment below and indicate where we will revise the manuscript to strengthen the presentation of the human-to-AI mapping and the proposed taxonomy.

read point-by-point responses

  1. Referee: [Abstract and §2] Abstract and §2 (human memory analysis): the direct mapping of human categories (e.g., episodic memory) onto LLM mechanisms (e.g., context windows or external vector stores) is presented as inspirational without addressing core mismatches in consolidation and interference mechanisms; this mapping is load-bearing for the claim that human memory can guide construction of more powerful AI systems.

    Authors: We agree that the current treatment would be improved by explicitly discussing mismatches between biological and artificial memory. While the mapping is intended as inspirational rather than literal, we will revise §2 to add a short subsection on limitations of the analogy. This subsection will cover differences in consolidation (e.g., human offline replay and synaptic consolidation versus LLM fine-tuning or retrieval augmentation) and interference management (e.g., biological forgetting curves versus LLM techniques such as memory editing or selective context truncation). The revision will clarify the scope of the design guidance while preserving the high-level parallels that motivate the survey. revision: yes

  2. Referee: [§3] §3 (proposed categorization): the assertion that the three dimensions (object, form, time) are sufficiently independent to generate eight meaningful quadrants lacks explicit justification or empirical check for orthogonality; if form is largely determined by object or time in current LLM architectures (parametric vs. retrieval-based), the scheme reduces to fewer effective dimensions and undermines the organizational contribution.

    Authors: We thank the referee for highlighting the need for stronger justification. In the revised §3 we will add a paragraph explaining the conceptual independence of the three dimensions: 'object' concerns the nature of the stored content, 'form' concerns the representation mechanism, and 'time' concerns retention duration. We will also provide an empirical check by tabulating the distribution of the surveyed papers across the eight quadrants, showing that all quadrants contain distinct contributions and are not trivially reducible. Where current architectures exhibit correlations between dimensions, we will note these as open challenges rather than assuming perfect orthogonality. revision: yes

Circularity Check

0 steps flagged

Survey proposes taxonomy with no derivation chain or self-referential reduction

full rationale

This is a literature survey paper with no mathematical derivations, equations, fitted parameters, or predictions. The core contribution is an analysis of human memory categories mapped to AI systems plus a proposed three-dimension (object, form, time) eight-quadrant organizational scheme for existing work. These are descriptive and constructive proposals resting on external citations rather than any internal definition that reduces to itself or a self-citation load-bearing premise. No step in the provided abstract or described structure exhibits the enumerated circularity patterns; the taxonomy is presented as an independent organizing framework, not derived from or equivalent to its inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The survey rests on standard domain assumptions about memory processes and literature review practices. No free parameters or invented entities are introduced.

axioms (1)
  • domain assumption Human memory categories can be meaningfully related to memory mechanisms in LLM-driven AI systems.
    Invoked in the first part of the survey when analyzing categories of human memory and relating them to AI memory.

pith-pipeline@v0.9.0 · 5566 in / 1281 out tokens · 79996 ms · 2026-05-17T11:00:17.372542+00:00 · methodology

discussion (0)

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