The Cognitive Neuroscience of Music

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