Neural coordination of bilateral power and precision finger movements

Abstract

The phylogenetic development of upper extremities for other tasks than locomotion represents the basis for the cultural achievement of human beings (Herder, 1785). Upright stance and gait allow the use of hands and fingers to perform a wide variety of voluntarily controlled tasks used in activities of daily life (ADL) or for cultural purposes. In most frequently performed ADL movements fingers act as part of the hand, that is, hand and fingers operate as a unity. This group of motor tasks comprises, for example, reaching and grasping an object. In contrast, in another group of tasks fingers move independently from the hand, such as picking up a raspberry. This requires a cortico-motoneuronal (CM) command in combination with a rapid feedback adaptation of finger forces applied to the berry.In motor tasks involving both hands, power grips can also be separated from precision movements. A typical example of a power grip task represents the opening of a bottle which requires a close cooperation of the two hands. Or lifting up

The impact of lesion side on bilateral upper limb coordination after stroke

“…We did not study fine-motor control because many stroke patients are not capable of generating independent finger movements. However, it is important to note that there are neurophysiological and neuroanatomical differences in the control of bilateral proximal limb-coordination vs. bilateral distal-limb coordination [ 56 ]. For example, electrical stimulation to forearm muscles on one limb during bilateral hand movement resulted in muscular responses in both limbs, whereas stimulation to one finger during bilateral finger movement resulted in responses only in the stimulated finger.…”

“…Furthermore, the human bilateral movement repertoire is very broad, and there exist many other patterns apart from the cyclical rhythmical pattern tested here. Some may be asymmetrical and more complex (such as playing the piano), and some may not be rhythmic (such as opening a bottle) [ 56 ]. Another limitation is that we only included participants who were right-handers before stroke.…”

Time to move: Brain dynamics underlying natural action and cognition

“…The study by Park et al (2021) compared digital trail-making-test performance while walking before and after exercise to determine neural correlates of improved performance. In the review paper by Dietz (2020), studies investigating neural coordination of bilateral power and precision finger movements are discussed.…”

Behavior-Dependent Corticocortical Contributions to Imagined Grasping: A BCI-Triggered TMS Study

“…For instance, in a published study [15], Grigorev et al showed that vibrotactile feedback was useful to increase corticospinal excitability in hand muscles during motor imagery with an ERD-based BCI system. Moreover, Dietz et al proposed an ERD-based brainmachine interface to work effectively in the clinical recovery of functional movements [16]. Consistent with these studies, the physiological characteristics of ERD have been used as EEG markers in an online BCI system in the last few decades.…”