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2. IBM PC based visual evoked potential stimulator and averager
- Creator:
- Kaminsky, Yu., Bureš, J., Kittlerová, P., and Krekule, I.
- Type:
- article, model:article, and TEXT
- Subject:
- patterned visual stimulation, visual evoked potentials, averaging, IBM PC, and I/O board
- Language:
- English
- Description:
- Custom made hard and software enhancement of an IBM PC is described which makes it possible to: i) provide patterned visual stimulation by using the EGA or higher level display, ii) average recorded potentials and iii) monitor the experiment simultaneously. The description is illustrated by examples from a study of retinal evoked potentials in the rat.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Late divergence of target and nontarget ERPs in a visual oddball task
- Creator:
- Alena Damborská, Milan Brázdil, Ivan Rektor, Eva Janoušová, Chládek, J., and Miloslav Kukleta
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, fyziologie člověka, human physiology, intracerebral recording, oddball task, visual evoked potentials, mental counting, memory, 14, and 612
- Language:
- English
- Description:
- Different mental operations were expected in the late phase of intracerebral ERPs obtained in the visual oddball task with mental counting. Therefore we searched for late divergences of target and nontarget ERPs followed by components exceeding the temporal window of the P300 wave. Electrical activity from 152 brain regions of 14 epileptic patients was recorded by means of depth electrodes. Average target and nontarget records from 1800 ms long EEG periods free of epileptic activity were compared. Late divergence preceded by almost identical course of the target and nontarget ERPs was found in 16 brain regions of 6 patients. The mean latency of the divergence point was 570±93 ms after the stimulus onset. The target post-divergence section of the ERP differed from the nontarget one by opposite polarity, different latency of the components, or even different number of the components. Generators of post-divergence ERP components were found in the parahippocampal gyrus, superior, middle and inferior temporal gyri, amygdala, and fronto-orbital cortex. Finding of late divergence indicates that functional differences exist even not sooner than during the final phase of the task., A. Damborská ... [et al.]., and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
4. Saccadic eye movement related potentials
- Creator:
- Fedor Jagla, Jergelová, M., and Igor Riečanský
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, fyziologie člověka, zrakové evokované potenciály, elektroencefalografie, pozornost, nemoci mozku, human physiology, visual evoked potentials, electroencephalography, attention, brain diseases, sakády, lateralita, saccades, laterality, 14, and 612
- Language:
- English
- Description:
- The saccadic eye movement related potentials (SEMRPs) enable to study brain mechanisms of the sensorimotor integration. SEMRPs provide insight into various cognitive mechanisms related to planning, programming, generation and execution of the saccadic eye movements. SEMRPs can be used to investigate pathophysiological mechanisms of several disorders of the central nervous system. Here we shortly summarize basic findings concerning the significance of SEMRP components, their relationship to the functional brain asymmetry and visual attention level as well as changes related to certain neuropsychological disorders., F. Jagla, M. Jergelová, I. Riečanský., and Obsahuje bibliografii a bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
5. Visual evoked potential evidence for magnocellular system deficit in dyslexia
- Creator:
- Kubová, Z., Kuba, M., Peregrin, J., and Nováková, V.
- Type:
- article, model:article, and TEXT
- Subject:
- dyslexia, visual evoked potentials, motion, and magnocellular system
- Language:
- English
- Description:
- Some recent studies on dyslexia have suggested a selective abnormality in the magnocellular visual pathway. To verify this hypothesis, we investigated motion-onset visual evoked potentials (VEPs) (predominantly testing the magnocellular system) as well as pattern-reversal VEPs (presumably testing the parvocellular system) in 20 dyslexics and 16 controls (both groups with a mean age of 10.0 years). Although the latencies and amplitudes of the main positive peak of pattern-reversal VEPs did not differ between the dyslexic and control group, the motion specific negative peak of motion-onset VEPs was significantly delayed (p<0.001) in dyslexics. Our results confirm a selective magnocellular pathway disorder in dyslexics and indicate that the motion-onset VEPs might serve as an objective method for early diagnosis of dyslexia.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public