The neuronal basis of a sensory analyser, the acridid movement detector system. IV. The preference for small field stimuli

1977 ◽  
Vol 68 (1) ◽  
pp. 157-185
Author(s):  
CH Fraser Rowell ◽  
M O'Shea ◽  
JL Williams
Keyword(s):  
Detector System ◽  
Movement Detector ◽  
Small Field

Evaluation of reproducibility of a vessel wall movement detector system for assessment of large artery properties

1994 ◽  
Vol 28 (5) ◽  
pp. 610-614 ◽  
Author(s):  
M J F Kool ◽  
T v. Merode ◽  
R S Reneman ◽  
A P G Hoeks ◽  
H A J S. Boudier ◽  
...  
Keyword(s):  
Vessel Wall ◽  
Detector System ◽  
Movement Detector ◽  
Large Artery ◽  
Wall Movement

New ocular movement detector system as a communication tool in ventilator-assisted Werdnig–Hoffmann disease

2000 ◽  
Vol 42 (01) ◽  
pp. 61 ◽  
Author(s):  
Masaya Kubota ◽  
Yoichi Sakakihara ◽  
Yoshiaki Uchiyama ◽  
Atsushi Nara ◽  
Tsutomu Nagata ◽  
...  
Keyword(s):  
Detector System ◽  
Movement Detector ◽  
Communication Tool ◽  
Ocular Movement ◽  
Werdnig Hoffmann

Neuronal basis of a sensory analyser, the acridid movement detector system. III. Control of response amplitude by tonic lateral inhibition

1976 ◽  
Vol 65 (3) ◽  
pp. 617-625
Author(s):  
C. H. Fraser Rowell ◽  
M. O'Shea
Keyword(s):  
Visual Field ◽  
Lateral Inhibition ◽  
Optic Lobe ◽  
Inhibitory Effect ◽  
Test Area ◽  
Detector System ◽  
Movement Detector ◽  
Field Change ◽  
Surrounding Area ◽  
Small Areas

1. The Lobular Giant Movement Detector neurone (LGMD) of Schistocerca responds with spikes when small areas of the visual field change in luminance. Previous work has shown that changes of +/− 1 log 10 unit are enough to produce maximal ON and OFF responses. 2. Using a 5 degree test area, it is shown that the number of spikes generated by such a stimulus depends on the luminance of the surrounding area. When the surround is dark, the response is maximal; when it is brightly lit, the response is minimal. Intermediate intensities produce intermediate values of response. A X 2 change in response is produced by about 3 log 10 units change in surround intensity. 3. A bright annulus, with diameters of 10-5 degrees and 25-8 degrees, inhibits both ON and OFF responses when concentric with the 5 degree test area, but not when it is 30 degrees eccentric to the test area. The inhibitory effect shows no decrease after 4 min. 4. These results are interpreted to indicate a tonic lateral inhibitory network, sited peripherally in the optic lobe prior to the divergence of the separate ON and OFF channels found in the projection from the medulla to the LGMD. It is probably identical with that described for the lamina by previous workers.

A high resolution 2D array detector system for small-field MRI-linac applications

2018 ◽  
Vol 4 (3) ◽  
pp. 035041 ◽  
Author(s):  
Maegan Gargett ◽  
Brad Oborn ◽  
Sarah J Alnaghy ◽  
Trent Causer ◽  
Marco Petasecca ◽  
...  
Keyword(s):  
High Resolution ◽  
Detector System ◽  
Array Detector ◽  
Small Field ◽  
2D Array

scholarly journals The neuronal basis of a sensory analyser, the acridid movement detector system. I. Effects of simple incremental and decremental stimuli in light and dark adapted animals

1976 ◽  
Vol 65 (2) ◽  
pp. 273-288
Author(s):  
C. H. Rowell ◽  
M. O'shea
Keyword(s):  
Dark Adaptation ◽  
Action Potentials ◽  
Light Adaptation ◽  
Test Area ◽  
Detector System ◽  
Retinula Cell ◽  
Movement Detector ◽  
Contralateral Movement ◽  
Adaptation Action

1. The response of the movement detector (MD) system to proportionally constant incremental and decremental stimuli has been studied at various degrees of light and dark adaptation. Action potentials in the descending contralateral movement detector neurone were taken as the indicator of response. 2. Over a range of at least six log10 units of adapting luminance, the MD system behaves as an ON/OFF unit, giving responses to both incremental and decremental changes in the illumination of a 5 degrees target. 3. With increasing amplitudes of stimuli, both the ON and OFF responses saturate rapidly. Saturation is reached sooner at higher levels of light adaptation. At all levels of light adaptation, the OFF response is greater than the ON. The ratio for saturating stimuli is approximately constant at around 3:2. 4. At the brightest adapting luminances used (20 000 cd/m2) the ON response is reduced but not lost. At the lowest (0–004 cd/m2) the OFF response to a 5 degrees disc fails, but can be regained by increasing the test area to 10 degrees. 5. From what is known of the retina of locusts and other insects, it is thought that light and dark adaptation in the MD system can be adequately explained by events at the retinula cell.

scholarly journals EP-1367: Characterization of a new plastic scintillator detector system for small field dosimetry

2015 ◽  
Vol 115 ◽  
pp. S736-S737
Author(s):  
B. Mazzotta ◽  
L. Radici ◽  
C. Cutaia ◽  
R. Cirio ◽  
M. Stasi
Keyword(s):  
Plastic Scintillator ◽  
Detector System ◽  
Small Field ◽  
Small Field Dosimetry ◽  
Scintillator Detector

scholarly journals New ocular movement detector system as a communication tool in ventilator-assisted Werdnig-Hoffmann disease

2007 ◽  
Vol 42 (1) ◽  
pp. 61-64
Author(s):  
Masaya Kubota ◽  
Yoichi Sakakihara ◽  
Yoshiaki Uchiyama ◽  
Atsushi Nara ◽  
Tsutomu Nagata ◽  
...  
Keyword(s):  
Detector System ◽  
Movement Detector ◽  
Communication Tool ◽  
Ocular Movement ◽  
Werdnig Hoffmann
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