ArticleFrontiers in cognition2026
Gamma frequency transcranial alternating current stimulation over the visual cortex modulates contour integration.
Article in Frontiers in cognition, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
2 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Introduction: The visual system must integrate spatially fragmented information to perceive coherent object boundaries. Contour integration represents a fundamental process underlying this perceptual organization by linking discrete edge elements into continuous contour. Gamma oscillations have been associated with perceptual grouping processes, from contour integration to object perception; however, their causal contribution to contour integration remains unclear. Methods: Participants performed a contour detection task in which they identified the orientation of a target contour composed of four collinearly aligned segments embedded among randomly oriented and positioned distractors. To investigate the role of gamma oscillations in contour integration, participants were randomly assigned to one of three groups: gamma-tACS (40 Hz), theta-tACS (7 Hz; active control), or sham stimulation (control condition). Participants completed both pre-stimulation and stimulation sessions. During the stimulation session, the assigned tACS was applied over the early visual cortex. Results: A mixed-effects linear model analysis revealed a significant session × group interaction, such that contour detection performance improved from the pre-stimulation session to the stimulation session specifically in the gamma-tACS group, whereas no comparable improvement was observed in the sham and theta-tACS groups. Discussion: These findings provide causal evidence that gamma-frequency stimulation over occipital cortex can facilitate contour integration, suggesting that gamma-band oscillations contribute to the integration of spatially distributed visual elements into coherent contours.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.