PSYCHOPHYSICAL TEST FOR BIMODAL INTEGRATION OF ELECTRORECEPTION AND PHOTORECEPTION IN THE CATFISH ICTALURUS NEBULOSUS LeS

2000 ◽  
Vol 50 (3) ◽  
pp. 389-400 ◽  
Author(s):  
J.A.M. Lorteije ◽  
F. Bretschneider ◽  
I. Klaver ◽  
R.C. Peters
Keyword(s):  
Ictalurus Nebulosus ◽  
Psychophysical Test

Psychophysical Test for Bimodal Integration of Electroreception and Photoreception in the Catfish Ictalurus Nebulosus LeS

2000 ◽  
Vol 50 (3) ◽  
pp. 389-400
Author(s):  
J.A.M. Lorteije ◽  
F. Bretschneider ◽  
I. Klaver ◽  
R.C. Peters
Keyword(s):  
Ictalurus Nebulosus ◽  
Psychophysical Test

scholarly journals Clinical Perspectives and Trends: Microperimetry as a trial endpoint in retinal disease

2021 ◽  
Author(s):  
Yesa Yang ◽  
Hannah Dunbar
Keyword(s):  
Clinical Trial ◽  
Retinal Disease ◽  
Age Related Macular Degeneration ◽  
Gene Therapies ◽  
Age Related ◽  
Wide Range ◽  
Trial Endpoints ◽  
Visual Acuity Loss ◽  
Psychophysical Test ◽  
Trial Endpoint

Endpoint development trials are underway across the spectrum of retinal disease. New validated endpoints are urgently required for the assessment of emerging gene therapies and in preparation for the arrival of novel therapeutics targeting early stages of common sight-threatening conditions such as age-related macular degeneration. Visual function measures are likely to be key candidates in this search. Over the last two decades, microperimetry has been used extensively to characterize functional vision in a wide range of retinal conditions, detecting subtle defects in retinal sensitivity that precede visual acuity loss and tracking disease progression over relatively short periods. Given these appealing features, microperimetry has already been adopted as an endpoint in interventional studies, including multicenter trials, on a modest scale. A review of its use to date shows a concurrent lack of consensus in test strategy and a wealth of innovative disease and treatment-specific metrics which may show promise as clinical trial endpoints. There are practical issues to consider, but these have not held back its popularity and it remains a widely used psychophysical test in research. Endpoint development trials will undoubtedly be key in understanding the validity of microperimetry as a clinical trial endpoint, but existing signs are promising.

scholarly journals ACTIVE TRANSPORT OF D-GLOUCOSE BY INTESTINAL SEGMENTS IN VITRO, OF ICTALURUS NEBULOSUS ,

1964 ◽  
Vol 126 (2) ◽  
pp. 291-301 ◽  
Author(s):  
X. J. MUSACCHIA ◽  
S. S. NEFF ◽  
D. D. WESTHOFF
Keyword(s):  
Active Transport ◽  
Ictalurus Nebulosus ◽  
Intestinal Segments

Circadian rhythms in the brown bullhead, Ictalurus nebulosus (Teleostei). Evidence for an endogenous rhythm in feeding, locomotor, and reaction time behaviour

1980 ◽  
Vol 58 (10) ◽  
pp. 1899-1907 ◽  
Author(s):  
Lars-Ove Eriksson ◽  
Theo van Veen
Keyword(s):  
Reaction Time ◽  
Locomotor Activity ◽  
Feeding Activity ◽  
Brown Bullhead ◽  
Phase Angle Difference ◽  
Ictalurus Nebulosus ◽  
Angle Difference ◽  
Dark Regime ◽  
Free Running ◽  
Time Latency

Locomotor and feeding activity was investigated under(1) 12 h light(L): 12 h dark(D)and 16 h L: 8 h D, (2) 24 h D and 24 h L, and (3) dark pulses (0.75 h L: 0.25 h D), in the brown bullhead (Ictalurus nebulosus). In addition to locomotor and feeding activity, reaction time (latency time on lights-off and lights-on) was also measured.Fish subjected to a light–dark regime showed nocturnal behaviour, in many cases with a positive phase angle difference (i.e., the animals ceased their activity several hours before lights-on). Further, the actograms showed, as expected, a distinct 24 h rhythm. Only 2 brown bullheads out of 15, subjected to constant conditions, showed a circadian component in the locomotor activity, which could only be detected by frequency analysis.Nine out of 12 animals subjected to dark pulses (0.75 h L: 0.25 h D) showed a free-running circadian rhythm (approximately 23 h) in locomotor activity and 2 out of 3 showed such a rhythm in feeding activity. Observations and measurements of reaction time on leaving and re-entering the shelter after lights-off and lights-on (0.75 h L: 0.25 h D) showed also that this parameter has a circadian course. Measurements performed a fortnight later showed a similar, but less pronounced, pattern of behaviour.Dark pulses are thought to prevent rapid dissociation of a flexible multioscillatory circadian system in the brown bullhead.

Aggression of guarding male smallmouth bass (Micropterus dolomieui) towards potential brood predators near the nest

1993 ◽  
Vol 71 (2) ◽  
pp. 437-440 ◽  
Author(s):  
R. J. Ongarato ◽  
E. J. Snucins
Keyword(s):  
Aggressive Behaviour ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Smallmouth Bass ◽  
Brown Bullhead ◽  
Ictalurus Nebulosus ◽  
Defence Behaviour ◽  
Micropterus Dolomieui ◽  
Brood Guarding

Models of potential brood predators placed near the nest were used to elicit defence behaviour in male smallmouth bass (Micropterus dolomieui) in the field. The three predator models represented a conspecific, a species found in the lake (yellow perch, Perca flavescens), and a species not present in the lake (brown bullhead, Ictalurus nebulosus). Aggressive behaviour increased with brood age and with decreasing distance between model and nest. Brood-guarding smallmouth bass exhibited a generalized response to the three predator models and did not discriminate between them by altering levels of aggression.

Ictalurus nebulosus (Lesueur) (Brown bullhead) 2n = 60

1973 ◽  
pp. 17-19
Author(s):  
Maria Luiza Beçak ◽  
Willy Beçak ◽  
Franklin L. Roberts ◽  
Robert N. Shoffner ◽  
E. Peter Volpe
Keyword(s):  
Brown Bullhead ◽  
Ictalurus Nebulosus
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