Behavioural Brain Research: Asymmetry of hemisphere function in the brain - fNIRS functional verification study

Lateralization is often considered a key feature of the human brain, distinguishing it from the brains of other animals;
, for example, studies in primates have presented evidence of manually partialized behavior, which is associated with the lynx at the neurostructive level.
At the neurofunctional level, most primate studies focused on perceptive partialization and reported inconsistent results using functional magnetic resonance imaging (fMRI) or electron emission fault scanning (PET) scans.
compared with the left side of language, studying the emotional perception of primates enhances the right-hand side of emotional processing.
, however, one of the main flaws in the current study is the complexity of brain asymmetries in primates.
here, this paper uses functional near-infrared spectroscopy (fNIRS) to test whether the blood oxygen level dependence (BOLD) reaction in the brain has a corresponding difference between the two hemispheres after asymmetric hearing and sensory motion stimulation.
tested three healthy females (Talma, Rubis and Chet, with an average age of 14.6 years and a standard deviation ±3.5 years).
subjects had normal hearing and no nerve damage.
in human neuroscience, the effects of subjects' hands on brain skewing of language, motion and visual function are well known.
Although the dragonfly usually communicates with the right hand gesture at the group level, the hand preference direction (left hand, right hand, or ambiguity) may vary at the individual level when performing the two-handed coordination movement, and each hand preference when the gesture is manually communicated is reported here.
fNIRS device (Portalite, Artinis Medical Systems B.V., Elst, the herlands) to measure brain activation during sensory motion and auditory stimulation.
sensory exercise stimulation consists of 20 consecutive stretches of the same arm, with three alternating repetitions of all slugs left and right according to the same plan (L-R-R-L-L-R), resulting in a total of 120 arm movements.
After one experimenter on each side of the dragonfly gives a brief vocal command to another experimenter, he slowly stretches his arms throughout the stretching process (about 5 seconds) by stimulating the inside of the hand with his fingers (a gentle rhythmic tap).
hearing stimulation includes a series of agitating sounds from 20-second-long slugs and chimpanzees in social environments (the muscillas are lying in a fence outside; the chimps are held in the wild).
By calculating the difference between the values of the right hemisphere (RH) and the left hemisphere (LH), the asymmetry (AQ) is derived for each subject and each experimental condition (i.e., stimulating the right and left arms for sensory motion experiments; stimulating the right, left, and stereo auditory stimulation of auditory blocks).
In all subjects, the AQ difference between left and right arm stimuli was always side-by-side, with the left arm stimulating more right-hand activity in each arm than in the right arm stimulation, and the right arm stimulating more left-hand stimulation in all channels of right ear stimulation, with the average AQ value of Rubis and Chet significantly different from zero.
the right ear stimulation led to significantly more activation in the left hemisphere for these two slugs.
most effective result is sensory exercise stimulation.
the movement of Talma's right arm causes asymmetry in the left hemisphere and the movement of the left arm causes asymmetry in the right hemisphere.
Rubis has strong left hemisphere activation due to the stimulation of his right arm, while Chet shows strong right hemisphere activation in his left arm.
However, in Rubis and Chet, the difference in the direction of hemal asymmetry measurements between left and right arm stimulation in the motor cortical cortical layer is still the result of side-to-side results that show that fNIRS is an effective method of non-invasive acquisition of primate brain signals, especially in the study of motion-related nerves.
fNIRS captures this functional difference even when the mole is anaesthetized.
, however, great differences between individuals have also been found.
, Coralie Debracque, Thibaud Gruber, Romain Lacoste, Didier Grandjean, Adrien Meguerditchian, Validating the use of functional Near-Infrared Spect Roscopy in Monkeys: The case of brain activation lateralization in Papio anubis, Behavioural Brain Research, Volume 403, 2021, 113133, MedSci Original Source: MedSci Original Copyright Notice: All text, images and audio and video materials on this website are not licensed , no media, website or individual may reproduce, and the authorizing the reprint must indicate "Source: Metz Medicine".
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