Decreases in 40-Hz EEG Activity in the Olfactory Bulb Following γ-Irradiation of the Cat

1971 ◽  
Vol 46 (2) ◽  
pp. 343 ◽  
Author(s):  
Barbara P. Uzzell ◽  
Daniel E. Sheer
Keyword(s):  
Olfactory Bulb ◽  
Γ Irradiation ◽  
Eeg Activity ◽  
40 Hz

The association of age and aerobic activity history with 40-Hz EEG activity during cognitive challenge

1996 ◽  
Author(s):  
B. Hatfield ◽  
D. Santa Maria ◽  
T. Spalding ◽  
C. Blanchard ◽  
A. Haufler ◽  
...  
Keyword(s):  
Eeg Activity ◽  
Aerobic Activity ◽  
Cognitive Challenge ◽  
40 Hz

Cortical oscillations and temporal interactions in a computer simulation of piriform cortex

1992 ◽  
Vol 67 (4) ◽  
pp. 981-995 ◽  
Author(s):  
M. Wilson ◽  
J. M. Bower
Keyword(s):  
Large Scale ◽  
Activity Patterns ◽  
Piriform Cortex ◽  
Afferent Fiber ◽  
Field Potential ◽  
Afferent Input ◽  
Fiber System ◽  
Eeg Activity ◽  
Electrical Shocks ◽  
40 Hz

1. A large-scale computer model of the piriform cortex was constructed on the basis of the known anatomic and physiological organization of this region. 2. The oscillatory field potential and electroencephalographic (EEG) activity generated by the model was compared with actual physiological results. The model was able to produce patterns of activity similar to those recorded physiologically in response to both weak and strong electrical shocks to the afferent input. The model also generated activity patterns similar to EEGs recorded in behaving animals. 3. In addition to replicating known physiological responses, it has been possible to use the simulations to explore the interactions of network components that might underlie these responses. This analysis suggests that the physiological properties of the cortex are dependent on the complex interaction of both network and cellular properties. In particular, we have found that the relationship between conduction velocities in intrinsic cortical fiber systems and the time constants of excitatory and inhibitory effects are critical for replicating physiological results. 4. Analysis of the model also suggests a correspondence between the 40-Hz oscillatory patterns of activity induced by low levels of odor-like stimulation and oscillatory patterns seen in lightly anesthetized cortex in response to weak electrical shocks to the afferent fiber system. 5. The specific relationships we have found between the different components of the model also support several speculations on their functional significance. The simulations suggest that during each 40-Hz cycle of EEG activity there is a convergence in rostral cortex of afferent information from the olfactory bulb and recurrent association fiber information from caudal cortex. This convergence could underlie an iterative process central to the recognition of complex olfactory stimuli.

Thyroid function and olfactory responses to L-alanine during induced smoltification in Atlantic salmon, Salmo salar

1997 ◽  
Vol 54 (3) ◽  
pp. 596-602 ◽  
Author(s):  
P -P Morin ◽  
T J Hara ◽  
J G Eales
Keyword(s):  
Thyroid Hormone ◽  
Atlantic Salmon ◽  
Olfactory Bulb ◽  
Salmo Salar ◽  
Olfactory Epithelium ◽  
Eeg Activity ◽  
Olfactory Responses ◽  
Full State ◽  
Thyroid Hormone Levels ◽  
State Plasma

For 5 weeks starting in mid-February we examined developmental correlations between external smolt features, plasma thyroid hormone levels, and olfactory responses in Atlantic salmon transferred from 0.9 to 11°C and exposed to a 16 h light : 8 h dark (16L) or an 8 h light : 16 h dark (8L) photoperiod. In 16L fish, external smolt features developed to 80% of full state, plasma L-thyroxine (T4) surged at week 3, but there were no changes in plasma 3,5,3 prime -triiodo-L-thyronine, olfactory bulb electroencephalographic (EEG), or olfactory epithelium electro-olfactographic (EOG) activities in response to nasal stimulation with L-alanine (10-9 to 10-5 M). In 8L fish, external smolt features were arrested at 40% of full state, plasma T4 showed no surge, EOG activity increased modestly, but EEG activity increased markedly at weeks 3 and 4. Thus, under the particular photoperiod and temperature conditions imposed in this study in February and March, enhanced olfactory activity can develop in premigratory Atlantic salmon independently of external smolt features or a significant surge in plasma T4.

Olfactory learning modifies the expression of odour-induced oscillatory responses in the gamma (60-90 Hz) and beta (15-40 Hz) bands in the rat olfactory bulb

2003 ◽  
Vol 17 (2) ◽  
pp. 350-358 ◽  
Author(s):  
Nadine Ravel ◽  
Pascal Chabaud ◽  
Claire Martin ◽  
Valérie Gaveau ◽  
Etienne Hugues ◽  
...  
Keyword(s):  
Olfactory Bulb ◽  
Olfactory Learning ◽  
40 Hz

Sensorimotor EEG rhythms and their connection to local/global neocortical dynamic theory

2000 ◽  
Vol 23 (3) ◽  
pp. 399-400 ◽  
Author(s):  
Colin Andrew
Keyword(s):  
Cortical Area ◽  
Dynamic Theory ◽  
Rhythmic Activity ◽  
Eeg Rhythms ◽  
Eeg Activity ◽  
Sensorimotor Rhythms ◽  
40 Hz

The EEG activity recorded from the human sensorimotor cortical area exhibits rhythmic activity covering a broad range of frequencies, including alpha, mu, beta, and gamma (40-Hz) rhythms. This commentary elaborates on connections between these sensorimotor rhythms and Nunez's neocortical dynamic theory.

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