Comparison between SI and SII responses as a function of stimulus intensity.
In this MEG study we investigated the differences in responses to somatosensory electrical stimuli between primary (SI) and secondary (SII) sensory cortices using 10 different levels of stimulus intensity, starting from below the sensory threshold up to a weak painful level. SI dipole source linearly increased in amplitude as the stimulus intensity raised up to a strong motor level and then saturated at higher stimulation levels. The contralateral and ipsilateral SII dipole source strengths followed the stimulus intensity growing up to the motor threshold, but showed a decrease at the strong motor level, followed by an increase as the stimulus intensity raised towards the weak painful threshold. These results suggest different responses of SI and SII cortices as the intensity of stimulation rises from non-painful to painful values.
Torquati
Kathya
K
Institute of Advanced Biomedical Technologies, Department of Clinical Sciences, University of Chieti, via dei Vestini 33-66013, Chieti, Italy.
Pizzella
Vittorio
V
Della Penna
Stefania
S
Franciotti
Raffaella
R
Babiloni
Claudio
C
Rossini
Paolo Maria
PM
Romani
Gian Luca
GL
D000328:Adult; D000344:Afferent Pathways / Q000502:physiology*; D001931:Brain Mapping; D004558:Electric Stimulation; D019054:Evoked Potentials, Motor / Q000502:physiology; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008475:Median Nerve / Q000502:physiology*; D009431:Neural Conduction / Q000502:physiology; D009619:Nociceptors / Q000502:physiology; D010146:Pain / Q000473:pathology / Q000503:physiopathology*; D017288:Pain Threshold / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013003:Somatosensory Cortex / Q000502:physiology*; D009435:Synaptic Transmission / Q000502:physiology*; D014110:Touch / Q000502:physiology*