The development of mesocerebral neurons in the snail Helix aspersa maxima

1992 ◽  
Vol 70 (10) ◽  
pp. 2034-2041 ◽  
Author(s):  
Shelley LaBerge ◽  
Ronald Chase
Keyword(s):  
Sexual Behaviour ◽  
Growth Phase ◽  
Reproductive Development ◽  
Reproductive Organs ◽  
Helix Aspersa ◽  
The Right ◽  
Snail Helix Aspersa ◽  
The Relationship ◽  
The Brain ◽  
Helix Aspersa Maxima

The neurons in the right mesocerebrum of Helix aspersa participate in the control of sexual behaviour. The purpose of this study was to examine the relationship between reproductive development and the development of mesocerebral neurons. The growth of right mesocerebral neurons was quantified by intracellular filling cells with hexamminecobalt chloride. It was found that the peak growth phase of the neurites preceded the peak growth phase of the penis by about 4 weeks. Comprehensive measurements from sectioned material showed that postembryonic growth in three regions of the brain was expressed as increases in soma diameters but not in neuron numbers. The rate of growth of neurons in the right mesocerebrum was significantly greater than that of neurons in the left mesocerebrum and the right postcerebrum. Ablations of the penis and dart sac did not affect the development of right mesocerebral neurons. Thus, no evidence was obtained for a trophic influence of the peripheral reproductive organs on the mesocerebrum.

IQ DISCREPANCIES AMONG IMPULSIVE AND NON-IMPULSIVE INMATES

1992 ◽  
Vol 20 (3) ◽  
pp. 213-217 ◽  
Author(s):  
Shirley N. Myers ◽  
Jon B. Ellis
Keyword(s):  
Future Research ◽  
Criminal Behaviour ◽  
Verbal Scale ◽  
The Right ◽  
The Relationship ◽  
The Brain ◽  
Performance Scale

The intention of this study was to examine the relationship between the right and left hemispheres of the brain and criminal behaviour. It was predicted that prisoners scoring higher on the Verbal scale than the Performance scale of the WAIS-R would tend to commit more analytical thought-out crimes. Those scoring higher on the Performance scale may be more impulsive type criminals and tend to commit crimes less thought out. A total of 51 inmates were tested with the WAIS-R. Inmates who scored lower on the Verbal scale than the Performance scale tended to be more impulsive. Due to the overlap in crimes committed by both types of criminals, it was recommended that future research in this area may include a third category of both impulsive-non-impulsive along with the separation of the two categories.

scholarly journals Multi-Hops Functional Connectivity Improves Individual Prediction of Fusiform Face Activation via a Graph Neural Network

2021 ◽  
Vol 14 ◽  
Author(s):  
Dongya Wu ◽  
Xin Li ◽  
Jun Feng
Keyword(s):  
Neural Network ◽  
Functional Connectivity ◽  
Brain Connectivity ◽  
Face Area ◽  
The Face ◽  
The Individual ◽  
The Right ◽  
And Function ◽  
The Relationship ◽  
The Brain

Brain connectivity plays an important role in determining the brain region’s function. Previous researchers proposed that the brain region’s function is characterized by that region’s input and output connectivity profiles. Following this proposal, numerous studies have investigated the relationship between connectivity and function. However, this proposal only utilizes direct connectivity profiles and thus is deficient in explaining individual differences in the brain region’s function. To overcome this problem, we proposed that a brain region’s function is characterized by that region’s multi-hops connectivity profile. To test this proposal, we used multi-hops functional connectivity to predict the individual face activation of the right fusiform face area (rFFA) via a multi-layer graph neural network and showed that the prediction performance is essentially improved. Results also indicated that the two-layer graph neural network is the best in characterizing rFFA’s face activation and revealed a hierarchical network for the face processing of rFFA.

Peptides in the brain of the common snail, Helix aspersa

1982 ◽  
Vol 10 (5) ◽  
pp. 384-385 ◽  
Author(s):  
MARION E. WILLIAMSON ◽  
PIERS C. EMSON
Keyword(s):  
Helix Aspersa ◽  
Common Snail ◽  
The Common ◽  
Snail Helix Aspersa ◽  
The Brain
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