Enhanced late components of AEFs associated with the temporal lobe lesions

We recorded auditory evoked magnetic fields (AEFs) by presenting pure tone bursts once every 4000 ms in 11 patients with a brain lesion in or in the v icinity of the auditory cortex. AEFs on the damaged side revealed several e nhanced deflections in late-latency AEFs (slow AEFs), peaking at similar to 320 (DI), 1030 (D2) and 1600 (D3) ms post-stimulus in eight patients. All the dipoles of slow AEFs were concentrated in the superior temporal regions which were not involved by brain lesions. D1, D2 and D3 dipoles were unifo rmly upward, downward and upward, respectively. The dipole moment varied fr om 12 to 122 nAm and had no consistent relationship with latency. This is t he first report describing slow AEFs in cases with temporal lobe lesions. N euroReport 12:1297-1300 (C) 2001 Lippincott Williams & Wilkins.