scholarly journals Practical Measurement and Reconstruction of Spectral Skin Reflectance

2020 ◽  
Vol 39 (4) ◽  
pp. 75-89 ◽  
Author(s):  
Y. Gitlina ◽  
G. C. Guarnera ◽  
D. S. Dhillon ◽  
J. Hansen ◽  
A. Lattas ◽  
...  
Keyword(s):  
Skin Reflectance ◽  
Practical Measurement

Practical measurement and modeling of spectral skin reflectance

2019 ◽  
Author(s):  
Yuliya Gitlina ◽  
Daljit Singh Dhillon ◽  
Giuseppe Claudio Guarnera ◽  
Abhijeet Ghosh
Keyword(s):  
Skin Reflectance ◽  
Practical Measurement

Ultraviolet reflectance and female mating preferences in the common kestrel (Falco tinnunculus)

2008 ◽  
Vol 86 (6) ◽  
pp. 479-483 ◽  
Author(s):  
E. Zampiga ◽  
G. Gaibani ◽  
D. Csermely
Keyword(s):  
Female Mate Choice ◽  
Female Preference ◽  
Visible Spectral Range ◽  
Falco Tinnunculus ◽  
Uv Filter ◽  
Skin Reflectance ◽  
Ultraviolet Reflectance ◽  
Uv Reflectance ◽  
Female Mating Preferences ◽  
Uv Reflection

Previous studies revealed the importance of plumage brightness (considering only the visible spectral range) in female mate choice of common kestrels ( Falco tinnunculus L., 1758). Our study focuses on the effect of UV reflectance on female preference; we hypothesize that common kestrel females prefer males with UV-reflecting plumage and refuse, or are not attracted to, males whose plumage UV reflectance is prevented. We tested the preference of 20 captive females who were given a choice between two males, one behind a UV-transmitting (UV+) filter and another one behind a UV-blocking (UV–) filter. Female preference was measured as frequency and duration of visits to either male, specifically by sitting on the perch or hanging on to the partition wall. Females visited the male behind the UV+ filter more often than the male behind the UV– filter, indicating that females prefer males with UV-reflecting plumage than males without UV reflection. UV plumage and skin reflectance could provide females with information regarding current male conditions more so than other colours and other morphological parameters.

scholarly journals Automated video-based heart rate tracking for the anesthetized and behaving monkey

2020 ◽  
Author(s):  
Mathilda Froesel ◽  
Quentin Goudard ◽  
Marc Hauser ◽  
Maëva Gacoin ◽  
Suliann Ben Hamed
Keyword(s):  
Heart Rate ◽  
Wavelet Transform ◽  
Ground Truth ◽  
Macaque Monkey ◽  
Head Motion ◽  
List Type ◽  
Tracking Method ◽  
Skin Reflectance ◽  
Behaving Monkeys ◽  
Human Primate

AbstractBackgroundHeart rate is extremely valuable in the study of complex behaviours and their physiological correlates in non-human primates. However, collecting this information is often challenging, involving either invasive implants or tedious behavioural training.New MethodIn the present study, we implement a Eulerian Video Magnification (EVM) heart tracking method in the macaque monkey combined with wavelet transform. This is based on a measure of image to image fluctuations in skin reflectance due to changes in blood influx.ResultsWe show a strong temporal coherence and amplitude match between EVM-based heart tracking and ground truth ECG, from both color (RGB) and infrared (IR) videos, in anesthetized macaques, to a level comparable to what can be achieved in humans. We further show that this method allows to identify consistent heart rate changes following the presentation of conspecific emotional voices or faces.Comparison with Existing Method(s)Eulerian Video Magnification (EVM) is used to extract heart rate in humans but has never been applied to non-human primates. Video photoplethysmography allows to extract awake macaques heart rate from RGB videos. In contrast, our method allows to extract awake macaques heart rate from both RGB and IR videos and is particularly resilient to the head motion that can be observed in awake behaving monkeys.ConclusionsOverall, we believe that this method can be generalized as a tool to track heart rate of the awake behaving monkey, for ethological, behavioural, neuroscience or welfare purposes.HighlightsHeart rate varies during complex non-human primate (NHP) behaviour and cognition.We apply Eulerian Video Magnification to track NHP heart rate (EVM-HR).EVM-HR can be used with RGB & IR videos, and anesthetized or awake NHPs.NHP EVM-HR vary with emotional content of presented stimuli.EVM-HR is of interest to ethology, behavioural, neuroscience & welfare purposes.

A Practical Measurement Strategy to Estimate Nonlinear Chlorinated Solvent Sorption in Low f oc Sediments

2012 ◽  
Vol 33 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Guohui Wang ◽  
Richelle M. Allen-King ◽  
Sungwook Choung ◽  
Stanley Feenstra ◽  
Robert Watson ◽  
...  
Keyword(s):  
Chlorinated Solvent ◽  
Measurement Strategy ◽  
Practical Measurement
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