386
Figure 25.1Short-term plasticity effect of the auditory cortex induced by notched music. (A) Music spectrum
notched at 1 kHz (top) and spectral characteristics of the test and control stimuli for MEG recording (bottom).
(B) Auditory evoked fields (AEF) of a single subject recorded for test stimulus (1 kHz,left panel) and control stimu-
lus (0.5 kHz,right panel) before and after listening to notched music. (C) Change in cortical representation or
respectively in the strength of the cortical source produced by listening to the notched music and calculated as the
moment (Q, nAm) of the equivalent current dipole fitted to the Nlm component of the AEF for test and control
stimuli averaged over subjects and days. (Modified from Ref. 20.)
Musical
spectrum
notched
at 1 kHz
Spectrum
to the
MEG stimuli
1 kHz Log frequency (kHz)
Log frequency (kHz)
Test stimulus Control stimulus
Before
After
Ch 12 Ch 12
Ch 35 Ch 35
0.5 kHz
Band passed
noise
Control stimulus
Band passed
noise
Test stimulus
1 kHz
200 f T
200 ms
Test stimulus
Control stimulus
- 5
Cortical strength (nAm)
- 4
- 3
- 2
- 1
0
1
2
A
B
C