SD Dojavi
OSMRTNICE
PRETPLATA
PREMIUM
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Nekada se vjerovalo da psi vide crno-bijelo, međutim, to baš i nije tako. U očnoj mrežnici postoje dvije vrste fotoreceptora: štapići i čunjići. Štapići su vrlo osetljivi i omogućavaju gledanje u uvjetima slabog osvetljenja, dok su čunjići odgovorni za dnevno gledanje i percepciju boja. Postoje tri vrste čunjića. Svaka vrsta reagira na različite valne dužine svjetlosti. Psi, kao i većina sisavaca, imaju dve vrste čunjića koji omogućavaju njihovom mozgu da razlikuju plavu od žute, ali ne i crvenu od zelene, piše National Geographic.

Jay Neitz, stručnjak za percepciju boja na Sveučilištu u Washingtonu, izveo je mnogo eksperimenata o percepciji boja kod pasa i kaže da su oči naših ljubimaca strukturirane na sličan način kao kod ljudi koji imaju tu vrstu daltonizma, odnosno čijim očima također nedostaje treća vrsta čunjića. Da bi mogli vidjeti plavu ili žutu psi, kao i ljudi, koriste neurone unutar mrežnice. Međutim, kada je je riječ o crvenoj i zelenoj, psi nemaju neurone koji bi na njih reagirale, pa valovi ovih boja imaju neutralan efekt. Objekte koje mi vidimo kao crvene ili zelene, psi vide u nijansama sive.

No psi imaju druge načine prepoznavanja onoga što je za ljude crvena boja. Na primer, boju koju mi nazivamo 'crvenom', psi vide tamnije od one koju zovemo 'zelena'. Iako imaju manje čunjića, broj štapića u mrežniciim je veći, zbog čega oni, u odnosu na ljude, bolje vide u mraku. Također, psi imaju veće zjenice nego ljudi zbog čega im oči propuštaju više svjetla, objasnila je veterinarka Katy Nelson. 'Psi također imaju i mnogo šire vidno polje nego ljudi i vide ugao od 250 stupnjeva, dok ljudsko oko vidi 190'.

'Vjerovatno ste primjetili da psima i mačkama oči mogu biti sjajno zelene u mraku, a to se događa zbog sjajne površine u zadnjem dijelu oka zvanom tapetum lucidum koji djeluje kao ogledalo i reflektira svetlost koja ulazi', priča dr Nelson pa nastavlja: 'To svijetlo pojačava i proces koji se naziva fluorescencija, a tapetum može odražavati i do 130 puta više svjetlosti nego ljudsko oko, zbog čega su psi pet puta osjetljiviji na svjetlost od nas.'

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Nekada se vjerovalo da psi vide crno-bijelo, međutim, to baš i nije tako. U očnoj mrežnici postoje dvije vrste fotoreceptora: štapići i čunjići. Štapići su vrlo osetljivi i omogućavaju gledanje u uvjetima slabog osvetljenja, dok su čunjići odgovorni za dnevno gledanje i percepciju boja. Postoje tri vrste čunjića. Svaka vrsta reagira na različite valne dužine svjetlosti. Psi, kao i većina sisavaca, imaju dve vrste čunjića koji omogućavaju njihovom mozgu da razlikuju plavu od žute, ali ne i crvenu od zelene, piše National Geographic.

Jay Neitz, stručnjak za percepciju boja na Sveučilištu u Washingtonu, izveo je mnogo eksperimenata o percepciji boja kod pasa i kaže da su oči naših ljubimaca strukturirane na sličan način kao kod ljudi koji imaju tu vrstu daltonizma, odnosno čijim očima također nedostaje treća vrsta čunjića. Da bi mogli vidjeti plavu ili žutu psi, kao i ljudi, koriste neurone unutar mrežnice. Međutim, kada je je riječ o crvenoj i zelenoj, psi nemaju neurone koji bi na njih reagirale, pa valovi ovih boja imaju neutralan efekt. Objekte koje mi vidimo kao crvene ili zelene, psi vide u nijansama sive.

No psi imaju druge načine prepoznavanja onoga što je za ljude crvena boja. Na primer, boju koju mi nazivamo 'crvenom', psi vide tamnije od one koju zovemo 'zelena'. Iako imaju manje čunjića, broj štapića u mrežniciim je veći, zbog čega oni, u odnosu na ljude, bolje vide u mraku. Također, psi imaju veće zjenice nego ljudi zbog čega im oči propuštaju više svjetla, objasnila je veterinarka Katy Nelson. 'Psi također imaju i mnogo šire vidno polje nego ljudi i vide ugao od 250 stupnjeva, dok ljudsko oko vidi 190'.

'Vjerovatno ste primjetili da psima i mačkama oči mogu biti sjajno zelene u mraku, a to se događa zbog sjajne površine u zadnjem dijelu oka zvanom tapetum lucidum koji djeluje kao ogledalo i reflektira svetlost koja ulazi', priča dr Nelson pa nastavlja: 'To svijetlo pojačava i proces koji se naziva fluorescencija, a tapetum može odražavati i do 130 puta više svjetlosti nego ljudsko oko, zbog čega su psi pet puta osjetljiviji na svjetlost od nas.'

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Christophe Simon/ Ilustracija/AFP
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ŽivotČETVERONOŽNI DALTONISTI

Znate li kako vaš pas vidi boje i zašto mu oči u mraku svijetle zeleno?

Piše PSD
28. listopada 2021. - 07:29
19806934
PREMIUM
Christophe Simon/ Ilustracija/AFP

Nekada se vjerovalo da psi vide crno-bijelo, međutim, to baš i nije tako. U očnoj mrežnici postoje dvije vrste fotoreceptora: štapići i čunjići. Štapići su vrlo osetljivi i omogućavaju gledanje u uvjetima slabog osvetljenja, dok su čunjići odgovorni za dnevno gledanje i percepciju boja. Postoje tri vrste čunjića. Svaka vrsta reagira na različite valne dužine svjetlosti. Psi, kao i većina sisavaca, imaju dve vrste čunjića koji omogućavaju njihovom mozgu da razlikuju plavu od žute, ali ne i crvenu od zelene, piše National Geographic.

Jay Neitz, stručnjak za percepciju boja na Sveučilištu u Washingtonu, izveo je mnogo eksperimenata o percepciji boja kod pasa i kaže da su oči naših ljubimaca strukturirane na sličan način kao kod ljudi koji imaju tu vrstu daltonizma...

#PSI#BOJE #LJUBIMCI#NATIONAL GEOGRAPHIC
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19. svibanj 2024 08:26