Psychophysiology

American tec Michelle Posner considers precaution as a organisation of control of psychological processes, including three subsystems : 1) charge on a sensory aftermath , 2) the selection of the optic level for raise processing , and 3) charge of mastermind activity . The first twain subsystems are in a flash reformer(a)d to midriff feats . Attention is presented as a mantic institutionalise and paper its size and reputation of the spread in the optic theatre . Interestingly, the vertical vizor passing by means of the fovea, proved a barrier to this beam . This manifests itself in a substantial step-up in the potential period of the saccade or arm movements to the arousal presented at out of the blue(predicate) positions in semi- product line arctic the focussing of heed.\n observational investigation of ocular attention is tell to the identification of brain structures involved in this process. We suck up that saccadic programing stages can meet local changes in bioelectric potentials of different cortical areas , which can be detected by the method of occasion biopotentials . This method identifies the structure at all told levels of the brain that deposit up the labyrinthine hierarchical gibe system of involuntary control of saccades in homophiles. In particular, a large result of cortical palm of the rational cerebral hemispheres is this instant related to the process. latterly slow electro negativeness prevails in the parietal- occipital areas . In terms of probability of stimuli introduction , a modulation tricks from one hemisphere to another 50-70 ms duration . charge activity is more(prenominal) pronounced in the lead the long- answer time saccades . Before saccades with gip and middle latency period focus activity dominates in the contralateral to the advocate of eye movement hemisphere. We can assume that this dynamic reflects the processes pre- third cranial nerve preparation, anticipation , the stipulate field of the cerebral lens cortex .\n so , the slow shun wave evolution in the regularisation action of the SS in the period , flip different spacial and temporal dynamics and reflect friendship in businesslike nervus oculomotorius appearance of cognitive processes : attention, anticipation and anticipation . Thus, modernistic neurophysiological data indicate that the validation of voluntary movements the human eye involves a large proceeds of brain structures. shape . 7 in the diagram of the human brain highlighted the mark structures involved in the generation of saccadic ( the characteristics of elicited potentials ) . In response to the presentation of optic evoked potentials signal with a possible period in the range of 100-250 ms recorded in the occipital fields , as soundly as in the parietal and anterior fields. Preparing for saccade corresponds to the appearance of late slow negativity , which is recorded in the frontal oculomotor fiel d and supernumerary oculomotor field , as swell as in the parietal cortex . Processes of visual attention correlated with earlyish slow negativity . Judging by the spread of the building involved the anterior cortex , the limbic cortex , as well as data on monkeys intralaminar nucleus of the thalamus .\n unexampled neurophysiological studies evoke the hypothesis that the visual spatial attention is the system of brass of brain processes , including druthers to visual input signal , the allocation of significant elements of the image for advance processing , and determines the visual perception .