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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20240329T150141Z
UID:https://www.bi.mpg.de/events/19126/2855
DTSTART:20200402T110000Z
DTEND:20200402T120000Z
CLASS:PUBLIC
CREATED:20190626T132305Z
DESCRIPTION:For any given species\, the design of an animal’s visual syst
em reflects the challenges of its ecological niche\; thus\, a promising ap
proach to study visual system function is to probe the system with natural
stimuli. Mice have become an important model in vision research\, but it
is still rarely considered that\, compared to primates\, they live in a di
fferent environment and therefore have different visual needs. For example
\, unlike primates\, mice are dichromatic and perceive UV light. Moreover\
, the mouse retina is subdivided into a mostly “green” sensitive (peak
at 510 nm) dorsal and UV sensitive (peak at 360 nm) ventral retina. There
fore\, presenting naturalistic stimuli in laboratory settings to non-prima
te species\, such as mice\, is challenging.Under the assumption that a sub
stantial fraction of mouse eye movements serves to stabilize the retinal i
mage\, we built a gimbal-stabilized\, spectrally-calibrated hand-held came
ra to explore the natural habitat of mice in the relevant spectral bands.
We intensity-calibrated the camera with LEDs of defined wavelengths and br
ightness using a power meter / spectrometer combination. The camera was mo
ved close to the ground along mouse tracks and UV/green movies of the mous
e habitat were recorded for different representative scenes and at differe
nt times of the day. By analysing contrast statistics of the movies\, we f
ound\, for example\, that contrast in the two chromatic channels (UV/ gree
n) diverged greatly in the upper but not in the lower visual field. This r
esonates well with reports of a higher fraction of colour-opponent retinal
ganglion cells in the ventral mouse retina and superior behavioural colou
r discrimination in the upper visual field. In addition\, we found that du
ring dusk and dawn\, “predators” coming from the sky should be more ea
sily detectable in the UV compared to the green channel\, which emphasizes
the UV’s role for mouse vision. Finally\, we designed different unsuper
vised models\, and when fitting them to our recordings\, we mainly found c
olor-opponent filters with training data of the upper visual field. In the
last part of the talk\, I will also show ongoing efforts to established a
light-weight\, head-mounted camera system\, which can capture the visual
environment from the perspective of freely roaming mice.\nVortragende: Pro
f. Dr. Laura Busse
LAST-MODIFIED:20200316T094025Z
LOCATION:Seewiesen\, Raum: Seminar Room House 4\, Tea & Coffee 12:30h
ORGANIZER:Prof. Dr. Manfred Gahr
SUMMARY:Talk Laura Busse\, Seewiesen: CANCELLED --- Laura Busse\, LMU Mu
nich: Video capture and analysis of the mouse’s natural visual envir
onment --- CANCELLED
URL:https://www.bi.mpg.de/events/19126/2855
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