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Most biological systems demonstrate some degree of asymmetry. From lower animals to human normal variation and specialization produce asymmetries of both function and structure. The term asymmetry is often substituted for the term laterality and indicate leftright differences, especially in neurosciences and psychology (Bryden, 1982). However, researchers generally use the term asymmetry in more global context of both structural and functional side dissimilarities while the term laterality is typically used exclusively in relation to functional asymmetry (Hughdahl, 2005). In numerous species representing major vertebrate taxa asymmetries of brain and behaviour have been demonstrated and it is supposed to be an universal feature of the vertebrate nervous system (Goutiérrez-Ibañez et al., 2011; Tommasi, 2009). In a neuroscience perspective the concepts of asymmetry in humans are closely tied to the two hemispheres of the brain (Grabowska et al., 1994; Hughdahl, 2005). Despite the mirror symmetrical organization of the body along the vertical body axis, the two brain hemispheres differ in their anatomy and function; moreover, asymmetries in the brain’s functional layout and cytoarchitecture have been correlated with asymmetrical behavioural traits – handedness, footedness, auditory perception, motor preferences and also sensory acuity (see Toga & Thompson, 2003 for review). Studies on anatomical asymmetries in the brain showed differences in distribution of tissue between hemispheres, although they are similar in both weight and volume (Toga & Thompson, 2003). Structural and neurochemical asymmetries in the majority of studies were reported to be linked with functional asymmetries of the brain and behaviour (especially the handedness). Some research showed cytoarchitectural asymmetry in the planum temporale related to handednessmarked leftward volume asymmetry. Additionally, this was also related to the degree of right-handedness of participants (Habib et al., 1995). In experiments with MRI Steinmetz observed greater asymmetry of this structure in right-handers in comparison to left-handers (Steinmetz, 1996). Structural asymmetry of central sulcus was reported to fit with the functional hemispheric asymmetry in relation to handedness (Babiloni et al., 2003), what indirectly confirms the relationship of laterality pattern in limbs and the motor cortex structure and function. Some investigators found differences between two brain hemispheres in levels of neurotransmitters (dopamine, norepinephrine), what was linked with various behavioural asymmetries (Glick, Ross & Hough 1982; Tucker &

Paresthesias as Reflection of the Lateral Asymmetry of Neural Function in Human