Brain stimulation separated seeing motion accurately from feeling confident

The findings suggest that judging what we see and judging how sure we are may rely on partly separate brain networks.

Editorial illustration — not from the study.

Researchers used two forms of non-invasive brain stimulation to test whether visual accuracy and confidence depend on the same brain circuits. They first strengthened connections between motion-processing and early visual areas, then disrupted activity in a region involved in evaluating decisions.

Strengthening the visual pathway affected both motion discrimination and confidence bias. Disrupting the intraparietal sulcus and nearby lateral intraparietal area changed metacognitive performance—how people evaluated their own decisions—without changing their ability to discriminate motion.

Accuracy and confidence

Strengthening the connection from the motion-processing area V5/MT+ to early visual areas V1/V2 affected both participants’ ability to discriminate motion and their metacognitive bias, or tendency to be more or less confident than their performance warranted. When researchers then disrupted activity in the intraparietal sulcus and nearby lateral intraparietal area, metacognitive performance changed while motion discrimination remained unaltered. Together, the results link perceptual sensitivity more closely to the V5/MT+–V1/V2 pathway and visual metacognition more closely to the intraparietal region.

Why the split matters

The study provides direct evidence that perceptual accuracy and confidence can be altered separately through different parts of the brain’s visual decision network. That distinction could inform future efforts to use non-invasive brain stimulation to target sensory decisions or metacognitive processes separately, although the abstract does not establish whether such applications would work beyond this motion-perception task.

Evidence and caveats

This is a journal article reporting results from targeted, non-invasive brain-stimulation experiments in motion perception. The abstract does not provide the sample size, effect sizes, follow-up duration or detailed comparison procedures, so the strength and durability of the effects cannot be assessed here. The findings concern motion discrimination and confidence in perceptual decisions; their relevance to other senses, tasks or clinical applications remains uncertain.

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