Brain and Behavior

The cerebellum is a key brain region responsible for balance and coordination, housing more neurons than the rest of the brain combined. Damage to the cerebellum disrupts the precision of rapid movements. It also plays a significant role in establishing new motor programs for executing sequences of timed actions and enhancing attention.

The basal ganglia is a complex of crucial subcortical structures, including the caudate nucleus, putamen, and globus pallidus. It is essential in initiating voluntary movements independent of stimuli and connects with different brain areas to modulate excitatory/inhibitory signals that dictate motor output selection and execution.

Huntington's Disease is a hereditary condition marked by motor dysfunction and neurodegeneration, manifesting in both jerky movements and psychological disorders. It typically arises in mid-adulthood and is linked to excessive CAG repeat sequences on chromosome #4. It is hard to treat/prevent because it's a progressive, hereditary neurodegenerative disease, and while presymptomatic testing can identify the genetic marker, effective treatments to halt or reverse the progression once symptoms appear are currently limited.

The primary somatosensory cortex is one of the cortical areas that contribute to motor control, as listed alongside other regions like the premotor cortex and primary motor cortex.

Mirror neurons are neurons active during both the preparation for a movement and when observing similar actions performed by others. They may play a critical role in understanding and imitating behaviors, contributing to social learning.

In Parkinson's disease, the specific neurons that die are the dopaminergic neurons in the substantia nigra. Their degeneration reduces motor cortex stimulation, leading to the characteristic symptoms.

An interesting aspect of this chapter is the concept of mirror neurons and their potential role in social learning and understanding others' actions. The idea that merely observing an action can activate similar neural pathways as performing it highlights a fascinating mechanism for empathy and skill acquisition.