title: [Results of a functional magnetic resonance study of the primary auditory cortex (I): general characteristics and individual outcomes].
abstract: OBJECTIVE
  To demonstrate and investigate the activation patterns of the primary auditory cortex (Heschl's gyrus) using functional magnetic resonance imaging (fMRI).
  
  
  METHODS
  Pure tone stimuli at 750 Hz and 2000 Hz were delivered to the right and left ear of 32 normal-hearing volunteers (18-49 years old) in 20-second on-off cycles. The fMRI data were obtained using a 1.5 Tesla scanner and processed with SPM2.
  
  
  RESULTS
  For both tone frequencies, bilateral hemispheric activation was identified in the transverse temporal gyrus (Heschl's gyrus) in 29 subjects (90.62 %) in response to pure tone stimuli with a probability level of p < 0.001. For monaural stimulation, bilateral hemispheric activation was observed with generally greater extent of activation in the Heschl's gyrus (HG) contralateral to the stimulated ear.
  
  
  CONCLUSIONS
  These results demonstrate that fMRI is a useful imaging technique to investigate the auditory cortex. The contralateral auditory cortex is more responsive than the ipsilateral cortex to tones presented monaurally.
authors: Servicio de Otorrinolaringología, Hospital Virgen de la Salud, Toledo, España. 34227lmc@comb.es
authors: Luis M
authors: LM
authors: Menéndez-Colino
authors: Josep
authors: J
authors: Traserra
authors: Carles
authors: C
authors: Falcón
authors: Joan
authors: J
authors: Berenguer
authors: Teresa
authors: T
authors: Pujol
authors: Joan
authors: J
authors: Doménech
authors: Manuel
authors: M
authors: Bernal-Sprekelsen
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D055815:Young Adult