Open research questions in Visual perception and processing mechanisms

What the literature leaves open

• The sample size was limited to 42 participants. The study only investigated the effects of relative S-R frequency in a two-choice task with four stimulus locations. The study did not control for other potential factors that could influence the results.

  Reaction times are shaped by global and local stimulus–response frequencies. · 2026 · DOI

• Investigate the effects of relative S-R frequency in more complex tasks and with larger sample sizes. Examine the neural mechanisms underlying the global and local effects of relative S-R frequency. Explore the potential applications of the findings in real-world settings.

  Reaction times are shaped by global and local stimulus–response frequencies. · 2026 · DOI

• The study faces the challenge of controlling for interocular differences and binocular rivalry. The experiment requires precise control of retinal eccentricity for the parafoveal stimuli. The study needs to minimize variability arising from interocular differences and binocular rivalry.

  Selective transfer of perceptual learning in parafoveal second-order motion: generalization to first-order motion but not to static second-order stimuli · 2026 · DOI

• Investigate the neural mechanisms underlying the training effect. Test second-order motion discrimination in other parts of the visual field. Examine the transfer of training to other types of visual stimuli.

  Selective transfer of perceptual learning in parafoveal second-order motion: generalization to first-order motion but not to static second-order stimuli · 2026 · DOI

• Real-world deployment, however, may involve several shifts simultaneously, and it remains unclear how these individual robustness measurements compose.

  Beyond Single-Axis Testing: Paired Evaluation of Compound Robustness in Vision-Language-Action Policies · 2026

• Whether these interactions among items merely limit access to visual information or serve a functional role in perception remains unknown.

  Compression of redundant visual information improves feature discrimination in human vision · 2026 · DOI

• Even though binocular integration is a foremost example of integrative computations in the brain, it remains unknown how the visual cortex mediates it.

  Selective binocular integration in mouse visual cortex: binocular but not monocular neurons respond distinctly to congruent stimuli · 2026 · DOI

• While the alignment of visual responses from each eye during this developmental critical period has been well-characterized, it remains unclear how this interocular alignment influences, and is influenced by, the binocularly driven responses of bV1 neurons.

  Eye-specific drive and binocular suppression in mouse visual cortex during critical period development · 2026 · DOI

• A unified percept depends on the coordinated interplay of sensory integration and suppression, yet how this interaction is implemented across cortical representations remains unclear.

  Interocular suppression weakens binocular disparity integration in the dorsal visual stream · 2026 · DOI

• Distinguishing between these two evolutionary outcomes has been limited by the ability to make direct comparisons between species.

  Expansion of a conserved architecture drives the evolution of the primate visual cortex · 2025 · DOI

• To address this considerable gap in knowledge, we developed an innovative wireless head-mounted eye-tracking system that performs Chair-free Eye-Recording using Backpack mounted micROcontrollers (CEREBRO) for small mammals, such as marmoset monkeys.

  Active vision in freely moving marmosets using head-mounted eye tracking · 2025 · DOI

• While the division of the early visual pathway into parvo- and magnocellular systems with distinct response properties has long been established as a prominent organizing principle in mammalian visual systems, the factors that lead to its emergence remain unclear.

  Potential role of developmental experience in the emergence of the parvo-magno distinction · 2025 · DOI

• However, it remains unclear if they engage different neural mechanisms and circuits within the visual attentional system.

  Distinct visual processing networks for foveal and peripheral visual fields · 2024 · DOI

• However, the precise neural basis and cellular mechanisms that underlie amblyopia and visual stimulation treatment remain to be elucidated.

  Interactions between excitatory neurons and parvalbumin interneurons in V1 underlie neural mechanisms of amblyopia and visual stimulation treatment · 2024 · DOI

• Although the topographic representation of space in the early visual cortex (EVC) has been favored as a neural correlate of spatial extent perception, its exact nature and contribution to perception remain unclear.

  Bounded contribution of human early visual cortex to the topographic anisotropy in spatial extent perception · 2024 · DOI

• However, it remains unclear just how accurately observers are able to estimate the motion direction of others and whether the gender of the observer and the walker affects the direction estimation.

  Estimations of biological motion walking direction are affected by observer and walker genders · 2024 · DOI

• However, it remains unclear whether these representations always reflect subjective experience or if they can be dissociated from it.

  Sensory representations in primary visual cortex are not sufficient for subjective imagery · 2024 · DOI

• 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 Yet how shape is encoded in the visual system remains poorly understood.

  High-level aftereffects reveal the role of statistical features in visual shape encoding · 2024 · DOI

• The paper identifies a gap in the understanding of the neural processes underlying visual perception, specifically the color afterimage effect. The gap is addressed by presenting a spiking neural network model that simulates key functional components of the early visual system.

  Computational modeling of spatiotemporal afterimage visual perception with spiking neural networks · 2026 · DOI

• Investigation of the neural basis of decision-making in other spatial navigation tasks. Development of new treatments for cognitive and motor disorders based on the findings of this study. Improvement of brain-machine interfaces and neuroprosthetics using the knowledge gained from this study.

  Cortex-wide characterization of decision-making neural dynamics during spatial navigation · 2026 · DOI

• A critical next step will be to determine how other training variables influence serial dependence. The paper suggests that studying the influence of past experiences on serial dependence could be a fruitful area of research.

  Insights into perceptual learning · 2026 · DOI

• The gap in current research is understanding why learning sometimes transfers to new locations. The paper aims to address this gap by studying the role of serial dependence.

  Insights into perceptual learning · 2026 · DOI

• The paper does not report any empirical results or data. The method is proposed as a theoretical framework, but its implementation and testing are not discussed. The paper does not address potential limitations or challenges of the content-matching method.

  Methodological foundations for locating the neural correlates of low-level visual experience · 2026 · DOI

• The paper identifies a gap in current research on the neural correlates of consciousness. The gap is the need for a new approach to identifying the neural basis of base experience. The content-matching method is proposed to fill this gap.

  Methodological foundations for locating the neural correlates of low-level visual experience · 2026 · DOI

• The common assumption that pupil-related effects on vergence can be treated as negligible or constant is challenged. There is a need to understand how pupil-vergence coupling changes across viewing states.

  As Far as Eye See: Vergence-Pupil Coupling in Near-Far Depth Switching · 2026 · DOI

Most-cited papers in Visual perception and processing mechanisms

• Oscillatory responses in cat visual cortex exhibit inter-columnar synchronization which reflects global stimulus properties · Nature · 1989 · 3,321 citations
• Forest before trees: The precedence of global features in visual perception · Cognitive Psychology · 1977 · 2,903 citations
• Perception in chess · Cognitive Psychology · 1973 · 2,840 citations
• Speed of processing in the human visual system · Nature · 1996 · 2,761 citations
• Attention and the detection of signals. · Journal of Experimental Psychology General · 1980 · 2,624 citations
• Synaptic Activity and the Construction of Cortical Circuits · Science · 1996 · 2,571 citations
• A cortical representation of the local visual environment · Nature · 1998 · 2,544 citations
• Segregation of Form, Color, Movement, and Depth: Anatomy, Physiology, and Perception · Science · 1988 · 2,481 citations
• Modulation of Oscillatory Neuronal Synchronization by Selective Visual Attention · Science · 2001 · 2,263 citations
• Borders of Multiple Visual Areas in Humans Revealed by Functional Magnetic Resonance Imaging · Science · 1995 · 2,204 citations

Most recent work

• Neural responses during natural vision are action-timed rather than locked to the onset of stable foveal input · bioRxiv · 2026
• Neural computations in the foveal and peripheral visual fields during active search · bioRxiv · 2026
• Microsaccadic eye movement generation is sufficient to enhance peripheral visual sensitivity · bioRxiv · 2026
• From stuff to things: Responses of neurons in macaque V4 to textures and objects · bioRxiv · 2026
• Light adaptation largely preserves the relative organization of parallel retinal channels: implications for efficient coding theory · bioRxiv · 2026
• Neural light field representation and reconstruction based on a ray displacement field · Optics Express · 2026
• Spatial Frequency Maps in Human Visual Cortex: A Replication and Extension · bioRxiv · 2026
• The Legacy of Perley G. Nutting Jr.: The Past and the Present of Chromatic Discrimination · Annual Review of Vision Science · 2026
• Ocular Response Functions reveal how ocular processes relate to neural activity · bioRxiv · 2026
• A transient signal in foveal superior colliculus neurons when jumpstarting peripheral saccadic orienting · bioRxiv · 2026

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