Early musical training shapes cortico-cerebellar structural covariation

Area of Science:

• Neuroscience
• Developmental Psychology
• Music Cognition

Background:

• Adult musical abilities are influenced by the age of training, with early experience yielding greater long-term effects.
• Early-trained musicians (ET; < age 7) outperform later-trained musicians (LT; > age 7) and show distinct brain structure (larger ventral premotor cortex, smaller cerebellum).
• Cortico-cerebellar networks mature and interact, suggesting early training may foster coordinated developmental plasticity.

Purpose of the Study:

• To investigate the hypothesis that early musical training promotes coordinated developmental plasticity in cortico-cerebellar networks.
• To examine structural covariation between cerebellar volume and cortical thickness in sensorimotor regions across ET musicians, LT musicians, and non-musicians (NMs).

Main Methods:

• Structural magnetic resonance imaging (MRI) was used to assess brain structure.
• Cortical thickness (CT) and cerebellar volumes were measured.
• Structural covariation analyses were performed between cerebellar lobules and sensorimotor cortical regions.

Main Results:

• Early-trained musicians (ETs) exhibited smaller volumes in cerebellar lobules connected to sensorimotor cortices.
• Both musician groups (ET and LT) showed increased cortical thickness in the right pre-supplementary motor area (SMA) and right premotor cortex (PMC) compared to NMs.
• Structural covariance patterns differed significantly: NMs showed negative correlations between left lobule VI and right pre-SMA/PMC, which were reduced in ETs, who instead showed a negative correlation between vermal IV and right pre-SMA/PMC.

Conclusions:

• Early musical training differentially impacts the maturation of cortico-cerebellar networks crucial for sensorimotor performance.
• These findings support the hypothesis that interconnected brain regions interact during development, reciprocally influencing brain and behavioral maturation.
• Early musical training leads to specific alterations in the structural relationships between the cerebellum and motor cortex.