REVIEW 5 major objections 5 minor 37 references
Can Mental Imagery Improve the Thinking Capabilities of AI Systems?
T0 review · 5 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read AI systems can reason by generating mental images, a new framework claims.
desk verdict A plausible conceptual framework, but the experiments never close the loop from generated images back into reasoning, so the paper's title question remains unanswered. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The central object is the Mental Imagery Unit, a module that receives a high-level stimulus from the Cognitive Thinking Unit, generates sketch-style images with a pretrained text-to-image diffusion model followed by a pencil-sketch filter, and sends the convenient images back to the Cognitive Thinking Unit for further reasoning. It is what turns a sentence into a time series of mental images representing the progression from an initial state to a final state. The reasoning loop alternates textual inference with visual simulation: the cognitive unit proposes sentences, the imagery unit visualizes them, and the cognitive unit then asks feasibility questions about the depicted scenario to decide on the next action.
What would settle it
Take the paper's 'man opens the door' scenario, generate the mental image for that prompt, then edit the sketch so the door is visibly locked while keeping the prompt unchanged; if the Cognitive Thinking Unit's next proposed action is identical to the unlocked-door case, the image content is not feeding the reasoning, and if the action changes, the imagery is contributing information.
Extended reading notes
Core claim
The author's central claim is that internally generated sketch images can participate in reasoning rather than being decorative byproducts of text prompts. The paper proposes a machine-thinking framework in which a Cognitive Thinking Unit receives sentences from a Needs Unit and an Input Data Unit, sends stimuli to a Mental Imagery Unit, and then inspects the imagery the unit returns in order to refine its conclusions. Thinking is explicitly modeled as 'exploring possible ways to achieve an event by generating a time series of mental images,' with images generated from sentences and adjusted as reasoning adds new knowledge. Validation experiments cover image captioning, matching needs to context via sentence embeddings, converting a three-step action plan into a sketch sequence with a pretrained text-to-image diffusion model, and generating alternative actions for a failed plan.
Load-bearing premise
The load-bearing premise is that the Cognitive Thinking Unit can extract task-relevant information from the generated mental images and use that information to update its reasoning, even though the experiments define the action plan as text prompts and produce the reasoning steps as text.
Editorial extensions
If this is right
- Reasoning can be initiated without an external query, because the Cognitive Thinking Unit can start from an internally stored need and generate the imagery needed to explore it.
- Action plans become inspectable as a sequence of sketches, so intermediate states can be checked and corrected before execution.
- Hypothetical reasoning, such as asking what happens if the keys do not open the door, can be handled by generating new mental images and deriving alternative actions from them.
- The framework unifies perception, internal motivation, and imagination in one architecture, which is exactly the gap the paper identifies in current reactive systems.
Reading between the lines
- Beyond the paper, the strongest version of the claim would close the loop by feeding sketch pixels back into the Cognitive Thinking Unit through a vision-language model, letting image content actually change the reasoning; the current experiments do not test this.
- Beyond the paper, the same architecture could serve as a low-cost world model for embodied agents, using generated sketches to predict the visual outcome of an action before an agent commits to executing it.
- Beyond the paper, a decisive test would use scenarios where the sketch necessarily contains information absent from the prompt, such as the spatial layout of objects; if the reasoning output does not change when the layout changes, mental imagery is not load-bearing.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes a machine-thinking framework in which a Cognitive Thinking Unit (CTU) is supported by three auxiliary units: a Needs Unit, an Input Data Unit, and a Mental Imagery Unit (MIU). The MIU is intended to generate sketches from natural-language stimuli, with the claim that these internally generated mental images contribute to reasoning, planning, and decision-making. The authors describe the architecture, report two experiments (sentence matching/action generation using text embeddings and a text-to-image-to-sketch pipeline), and conclude that the framework demonstrates potential to bridge perception, reasoning, and imagination.
Significance. If the central claim were established, the paper would address a real gap: current AI systems do not typically use internally generated visual representations as part of a reasoning loop, despite neuroscientific evidence that mental imagery supports human cognition. The paper also usefully surveys relevant work in machine reasoning, mental imagery, and generative models, and it identifies a concrete architectural idea (a mental imagery unit communicating with a cognitive unit). However, the significance is entirely conditional because the manuscript does not provide any experimental evidence that the generated images influence the CTU's output. The only quantitative experiment (Section 6.2) is text-only, and the only mental-imagery demonstration (Section 6.3) is a text-to-image rendering with no closed loop back into the reasoning process.
major comments (5)
- [Section 6.3] The central claim of the paper is not tested. In the only mental-imagery experiment, the action plan is predefined as text prompts ('a man takes the keys which are on the desk', 'the man goes towards the door', 'the man opens the door'), the MIU renders Stable Diffusion sketches from those prompts, and the subsequent reasoning ('the person is nervous', 'the person breaks down the door', 'the person call the firefighters') is produced as text by the CTU. There is no mechanism, code path, or experiment in which image pixels are fed back into the CTU and shown to affect its output. The causal order is text -> image -> illustration, not image -> reasoning. Consequently, the manuscript does not demonstrate that mental imagery improves thinking; it demonstrates only that text prompts can be turned into sketches.
- [Section 6.2] The only experiment with quantitative similarity scores uses sentence embeddings (all-MiniLM-L6-v2) over text captions; no image data is used in the matching or action-generation steps. The sentence-matching results and the generated actions ('Pick up the keys and open the door') would be identical if the MIU were removed entirely. This experiment therefore provides no evidence for the paper's stated claim that sketches serve 'informative and decision-making purposes.'
- [Section 5.2] The definition of thinking in Section 5.2 ('We consider thinking as the process of exploring possible ways to achieve an event by generating a time series of mental images') makes the conclusion that mental imagery is beneficial partly definitional. If thinking is defined as generating mental images, then any reasoning process that generates them trivially 'uses' mental imagery. The paper needs an independent experimental test that compares reasoning with and without the MIU; such an ablation is absent. The statement in Section 5.1 that 'the CTU then performs further reasoning based on these visualized images' is an assumption, not a demonstrated property.
- [Section 6.3, Figures 7 and 8] The mental-imagery experiment has no baseline, no ablation, and no quantitative evaluation. The reported outcome is a subjective statement that the sketches 'captured the essential spatial and semantic elements of each action.' There is no accuracy metric, no downstream task, no comparison with a text-only reasoning baseline, and no measure of how much the image content contributes beyond the prompt text. The final sentence of the experiment ('This experiment demonstrates that mental imagery generation from action sequences is a viable computational approach to support machine reasoning') is not supported by the evidence presented.
- [Section 4.3 and Section 5.1] The framework description promises a bidirectional interaction: the MIU 'communicates the convenient ones to the CTU' and the CTU 'refine[s] the result of reasoning.' However, no algorithm is given for how the CTU inspects or interprets the generated sketches, nor for how a 'convenient' image is selected, nor for how the image content modifies the reasoning state. Section 5.1 similarly states that 'the corresponding image is modified to incorporate the additional information,' but no mechanism is described. These are architectural desiderata, not implemented or validated components.
minor comments (5)
- [Throughout] The manuscript contains many grammatical and typographical errors (e.g., 'the sens of touch', 'The Cognitive Unit of Thinking refers to ... responsible for Interpreting', 'generate_action_f alcon', 'the person call the firefighters'). The writing needs careful editing.
- [Section 2] In the related-work discussion, the text mentions 'VilBERT' but the reference list entry [8] is for LXMERT; the naming should be corrected or the citation should be aligned with the model actually discussed.
- [Figure 1] The caption 'Diagram of Machine Thinking algorithms' may overstate the content; Figure 1 is a conceptual diagram, and the right side appears to be a human brain image. A clearer, more precise caption would help.
- [Section 5.2] The phrase 'the event is scheduled as a set of elementary events corresponding to the set of generated mental images' is vague; it is not clear what 'scheduled' means computationally or how the correspondence between images and elementary events is determined.
- [References] Several references are cited for claims about human cognition (e.g., [29], [30], [31]) but the text does not fully unpack how these neuroscientific findings translate into the proposed computational architecture; linking each cited work to a specific design choice would improve the argument.
Circularity Check
The paper's central claim that mental imagery improves thinking is partly self-definitional: Section 5.2 defines thinking as generating a time series of mental images, and the Section 6.3 validation only renders predefined text actions into sketches without demonstrating that image content feeds back into reasoning.
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self definitional
[Section 5.2 ('Thinking: A Computational Perspective'), with the supporting loop in Section 4.3 and the validation in Section 6.3]
"We consider thinking as the process of exploring possible ways to achieve an event by generating a time series of mental images. ... The Mental Imagery Unit receives stimulus from the Cognitive Thinking Unit (CTU), draws imagined images and communicates the convenient ones to the (CTU) which refine the result of reasoning."
This stipulates that thinking is mental-image generation, so the paper's claim that mental imagery is beneficial for reasoning is true by construction. Section 6.3's validation does not break the circularity: the action plan is a predefined text sequence ('a man takes the keys which are on the desk'), Stable Diffusion renders sketches from those prompts, and the subsequent reasoning ('the person is nervous') is also generated as text. There is no measured path from image pixels back into the CTU, so the 'refine the result of reasoning' loop exists only in the framework diagram. The conclusion then credits internally generated representations with enabling reasoning, a property inherited from the definition rather than demonstrated.
full rationale
The strongest circular step is definitional: Section 5.2 defines thinking as 'the process of exploring possible ways to achieve an event by generating a time series of mental images,' and the paper's conclusion attributes reasoning and decision-making to internally generated representations. If thinking is defined as mental-image generation, then finding that mental imagery is central to thinking is not an empirical result but a consequence of the definition. The only imagery experiment, Section 6.3, uses a predefined text action plan to generate Stable Diffusion sketches and then emits new reasoning as text; the paper itself admits that 'the current system uses predefined actions,' so no dynamic loop from image content to reasoning is tested. The other validation components (image captioning in 6.1 and need-context matching via sentence embeddings in 6.2) are non-circular, but they do not involve mental imagery and therefore do not support the title claim. There are no load-bearing self-citations; the cited neuroscience and robotics work is external. The score is 6 rather than higher because the paper frames the contribution as a framework with 'potential' rather than a quantitative prediction, yet the central conceptual claim nonetheless reduces in part to the paper's own definition of thinking.
Assumptions & free parameters
assumptions (4)
- ad hoc to paper Thinking can be defined as the generation of a time series of mental images.
- domain assumption Knowledge can be stored as natural language sentences and can be represented as sketches derived from previously seen images.
- domain assumption The Cognitive Thinking Unit can interpret internally generated mental images and reason based on their content.
- domain assumption Off-the-shelf pretrained models are sufficient building blocks for the proposed reasoning framework.
invented entities (1)
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Mental Imagery Unit (MIU) as a reasoning component
Cite this review
Pith. "Pith review of Can Mental Imagery Improve the Thinking Capabilities of AI Systems?." pith.science (2026). https://pith.science/paper/E2IP3GVK
@misc{pith2026250712555,
author = {Pith},
title = {Pith review of: Can Mental Imagery Improve the Thinking Capabilities of AI Systems?},
year = {2026},
howpublished = {\url{https://pith.science/paper/E2IP3GVK}},
note = {Machine review of arXiv:2507.12555}
}
read the original abstract
Although existing models can interact with humans and provide satisfactory responses, they lack the ability to act autonomously or engage in independent reasoning. Furthermore, input data in these models is typically provided as explicit queries, even when some sensory data is already acquired. In addition, AI agents, which are computational entities designed to perform tasks and make decisions autonomously based on their programming, data inputs, and learned knowledge, have shown significant progress. However, they struggle with integrating knowledge across multiple domains, unlike humans. Mental imagery plays a fundamental role in the brain's thinking process, which involves performing tasks based on internal multisensory data, planned actions, needs, and reasoning capabilities. In this paper, we investigate how to integrate mental imagery into a machine thinking framework and how this could be beneficial in initiating the thinking process. Our proposed machine thinking framework integrates a Cognitive thinking unit supported by three auxiliary units: the Input Data Unit, the Needs Unit, and the Mental Imagery Unit. Within this framework, data is represented as natural language sentences or drawn sketches, serving both informative and decision-making purposes. We conducted validation tests for this framework, and the results are presented and discussed.
Figures
Figures from the paper (5 more)
Reference graph
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