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A neurological disorder was a disorder affecting the brain.
Jean-Luc Picard suffered from a small structural defect in his parietal lobe, which possibly made him susceptible to several neurological disorders including Irumodic Syndrome. (TNG: "All Good Things...")
After being affected by a manipulated vinculum, Seven of Nine began to suffer from a neurological disorder which The Doctor characterised as the Borg equivalent of a multiple personality disorder. (VOY: "Infinite Regress")