Function of the two cerebral hemispheres asymmetry

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Functional brain asymmetry in the two hemispheres

, The non-dominant hemisphere dominant hemisphere tend to subordinate activities. (Vii) the interaction between the two cerebral hemispheres, although the brain function of a number of features to varying degrees on one side of the phenomenon, but the division is not very strict, there is still close between the two hemispheres strong interaction. From the morphological point of view, linking both sides of the hemisphere, the main bundle of nerve fibers of the corpus callosum, which connects the exception of some outside the primary projection area of the wide area on both sides of the brain hemispheres. If each axon the impulse frequency 2O Hz, then 11 seconds with 40 billion price of pulses in between the two hemispheres through which, under normal circumstances, the side of the hemisphere of the information can be transmitted quickly and efficiently the contralateral hemisphere, so that the entire brain as a whole is very effective activities. (Continued on page 19 11989 No. 3 reported a strong 17 Yunnan Biological Engineering fern plants without root, stem from differentiation, with a slim body axis in the original column, and other sub-dichotomous forked edges, special branch and style , thickness and other characteristics of cystic sporangia of view, they clearly belong to the bare fern plant family of plants representative of the cluster, but the sporangia from the top of the crack,[link widoczny dla zalogowanych], a second nature note aquatic characteristics and they may be more specialized group of nude fern A wetland plant orange clusters of stone sickle fern plants already have split the differentiation of root, stem, leaves Nobu origin of the small leaves, thick stems with a little star in the original column, the larger plants, up to one meter . stems rather thick surface ship with many holes in the cuticle and the epidermis. this plant more adaptable than Yunnan terrestrial fern work environment, they are typical of terrestrial plants. fern with a similar work environment of Yunnan in also the growth of a fern plant bare strange - stabbed with a fern (Taeniocradadubia, Figure 3) the flat axis of the body, into thin strip, ranging from dichotomous forked branches of a circle with 3 soil (~. dechenlanaGoepp ) axis of the base also has a tangle of complex branching system, indicating that they, like Tibet and Yunnan are the work of grass marsh plants. this strange flat ribbon plant may be shut by the cylindrical shape of the body formed by secondary character of its top students or sporangia (on the next page 17) of the two cerebral hemispheres function or dominant side of the phenomenon, but also solve the entire activities of the respective sides of the brain may produce contradictions and conflict. Even in the crack links the two hemispheres of the brain is interrupted were the case,[link widoczny dla zalogowanych], can also be conjugated through the eyes movement and the so-called subcortical integration of bilateral ties and compensation mechanisms to be adjusted to enhance the overall coordination of the two hemispheres function. Sperry reported a case of 13 at the age of the line split-brain patients who,[link widoczny dla zalogowanych], in 7 years later, Xu was born in a circular upright side branches over a brief account of early Devonian of Yunnan Qujing bare Green Mountain plant communities and the main types of ferns. In inviting a strata In addition to work in Yunnan ferns, stabbed with a fern, it also found a variety of similar fossil fern genus naked, for example, to be naked fern (Psilophytitessp.) hair fern (Thursophytonsp.), etc., due to incomplete fossil specimens, discrimination based only on two points forks and barbed shaft is hard to determine whether they are naked fern genera, so it is known to be naked fern. Nevertheless, these he found stone, or strong evidence of the fern plant as many bare the most primitive land plants, representing Southwest China was in fact widely distributed. In short, since the end of the Silurian fern plant bare until early Devonian period appear, land plants on Earth and developed rapidly, forming a current knowledge of the world's oldest terrestrial vegetation. naked from the fern plant in Southwest China study summarized as follows: 1. Early Devonian land plants, many born in coastal swamps,[link widoczny dla zalogowanych], nearly all of the herbs, transport organizations have developed , the lack of secondary structure, the general representative of the aquatic plants to the terrestrial from the original type. 2l In the early Devonian fern plant community appears nude, in which more specialized types are mostly the type of representative plants of the period of Yunnan Public fern, gill with fern fern to be naked, hair ferns and fern Lycopodium -3 from plant thorn sickle flora point of view, working on behalf of the fern genus of plants of the Silurian strata in Australia have found that, in addition to working ferns and j} i9 habits form with a fern on the specialization, can be inferred that appear bare of early Devonian fern plant may have longer development history, in other words, bare in the early Devonian fern plants may have landed long before life and distributed to other places in Southwest China. hemisphere exists as much. But the greater age at surgery,[link widoczny dla zalogowanych], after the significant progress and there is no such functional asymmetry of the two hemispheres of the brain problem, both in theory and practice is important . Although the field of exploration more than 100 years of history, but we are still poorly understood, particularly the role of coordination between the two hemispheres, yet to make a lot of research. 1989 3 Bulletin of Biology for a 19 -