Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  neuronal mechanism
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Slow oscillation circuit of the intergeniculate leaflet

100%
Lewandowski M. H., Blasiak T.
Acta Neurobiologiae Experimentalis
|
2004
|
tom 64
|
nr 2
2
Content available remote

Influence of stimulation of nasal afferents on expiration reflex evoked from vocal folds

80%
Plevkova J., Antosiewicz J., Poliacek I., Adamkov M., Jakus J., Svirlochova K., Tatar M.
Journal of Physiology and Pharmacology. Supplement
|
2009
|
tom 60
|
nr 5
3

Leon L. Voronin [1938-2004] Neuroscientist with the soul of a poet

80%
Bregestovski P., Turlejski K.
Acta Neurobiologiae Experimentalis
|
2005
|
tom 65
|
nr 1
4

Beta activity: a carrier for visual attention

80%
Wrobel A.
Acta Neurobiologiae Experimentalis
|
2000
|
tom 60
|
nr 2
The alpha (8-13 Hz), beta (15-25 Hz) and gamma (30-60 Hz) bands of the EEG have been long studied clinically because of their putative functional importance. Old experimental results indicate that repetitive stimulation of the visual pathway evokes synchronous responses at the cortical level with a gain that depends on frequency; oscillations within relevant bands are less damped at subsequent processing levels than others. Our current results show in the cat that cortico-geniculate feedback has a build-in potentiation mechanism that operates at around the beta frequency and activates thalamic cells thus lowering the threshold for visual information transmission. We have also shown that enhanced beta activity is propagated along this feedback pathway solely during attentive visual behavior. This activity consists of 300-1,000 ms bursts that correlate in time with gamma oscillatory events. Beta-bursting activity spreads to all investigated visual centers, including the lateral posterior and pulvinar complex and higher cortical areas. Other supporting data are discussed that are concerned with the enhanced beta activity during attentive-like behavior of various species, including humans. Finally, we put forward a general hypothesis which attributes the appearance of oscillations within the alpha, beta and gamma bands to different activation states of the visual system. According to this hypothesis, alpha activity characterizes idle arousal of the system, while beta bursts shift the system to an attention state that consequently allows for gamma synchronization and perception.
5

Involvement of single unit activity in inferotemporal and perirhinal cortices in recognition memory of visual objects in the macaque

70%
Sobotka S.
Acta Neurobiologiae Experimentalis
|
2000
|
tom 60
|
nr 2
Recognizing objects from the past is a vitally important ability for everyday live. The studies of brain mechanisms responsible for visual recognition memory suggest that the modulation of single unit activity in the inferotemporal and perirhinal cortices could be an important part of the neuronal substrate of recognition memory. In this review, I will describe Stimulus Specific Adaptation (SSA) - the reduction in neuronal response to previously viewed objects. The experimental tasks in which SSA is observed will be presented, along with the possibility that SSA may be enhanced by saccadic exploration of visual scene. Next, I will demonstrate that under special circumstances (partially split-brain preparation) monkeys could recognize the re-presentation of visual images without the concomitant appearance of SSA. The most promising alternative candidate for neuronal mechanism involved in recognition memory is delay activity - an increased frequency of cell firing in the time between the initial presentation of an image and its subsequent re-presentation. In order to determine if delay activity is important for recognition we have started to investigate the effects on recognition memory of disrupting delay activity by electrical stimulation. Preliminary results indicate a positive correlation between a reduction in delay activity and a decrease in recognition performance.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.