Rimmele · NeuroImage 2019 · controlled cohort pre-post training study · n=?

Working memory training integrates visual cortex into beta-band networks in congenitally blind individuals.

Level 3 - non-randomized controlled study

Non-randomized controlled cohort study comparing congenitally blind and sighted individuals before and after training

PubMed 30853565 · doi:10.1016/j.neuroimage.2019.03.003 · record verified 2026-08-26

What was done

Congenitally blind and sighted adults underwent magnetoencephalography (MEG) during resting state and a voice-based working memory task before and after working memory training (auditory stimuli, tactile stimuli, or a control condition). Authors measured long-range functional connectivity (imaginary coherency) across theta, beta, and gamma bands between visual cortex and auditory working memory networks.

What was found

The abstract reports frequency bands and anatomical connectivity changes but provides no numerical effect sizes or test statistics. Auditory working memory training strengthened theta-band (2.5–5 Hz) connectivity in sighted individuals among classic auditory working memory areas (inferior frontal, superior temporal, insular cortex). In congenitally blind individuals, training established beta-band (17.5–22.5 Hz) functional connectivity linking auditory working memory areas to the visual cortex.

Why it matters

This study indicates that cross-modal functional reorganization in congenital blindness involves frequency-specific (beta-band) integration of sensory-deprived visual cortex into cognitive networks following training.

Limits

The abstract does not state the sample size (n), participant demographics, or behavioral performance metrics. Numerical values, confidence intervals, and statistical significance levels are not reported. Randomization status among training conditions is unclear, and long-term retention of connectivity changes was not assessed.