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Ikan itu tidur ga sih?

Dimulai oleh reborn, November 25, 2006, 09:57:52 PM

« sebelumnya - berikutnya »

0 Anggota dan 2 Pengunjung sedang melihat topik ini.

reborn

Pernah liat ikan mojok di aquarium sambil merem ga? Ikan tidur ga sih, kok perasaan muter2 terus yahh  ???

arie_ds

Tidur, tapi matanya sambil melek...  ;D

reborn

Kutip dari: arie_ds pada Desember 04, 2006, 05:07:26 PM
Tidur, tapi matanya sambil melek...  ;D

Ini jawaban yakin atau sekedar nebak2 juga nih ... hehe... bisa juga sambil tidur dia melek, tapi masa bisa sambil berenang? Ga kepentok2 kaca tuh (kalo di aquarium) ???

Schrodinger

kalo menurut saya, ikan itu tidur tapi matanya melek. perhatikan deh, kalo ikan diem (ngambang) ga gerak-gerak tapi matanya melek, itu tandanya dia lagi tidur.   

peregrin

KutipSleep in marine mammals

All terrestrial mammals show relatively high-voltage neocortical EEG
activity bilaterally during NREM sleep. By contrast, cetaceans (whales
and dolphins) almost never have high-voltage slow waves in both
hemispheres at the same time. Manatees
(Trichechus inunguis, a member of the order Sirenia) also have unihemispheric
slow waves. In all marine mammals studied to date, the
eye contralateral to the brain hemisphere with slow waves is almost
always closed while the other eye is almost always open. There have
been no published reports documenting REM sleep in cetaceans, making
them the only studied mammals in which this state has not been
observed.
The bottlenose dolphin (Tursiops truncatus), when not floating or
resting on the bottom, generally swims in a single direction (usually
counterclockwise) even as the hemisphere with slow waves alternates.
Some smaller cetacean species are rarely, if ever, immobile. They move
and avoid obstacles 24 hours a day from birth until death, even during
unihemispheric slow-wave activity. These animals may never exhibit
the immobility that we use in terrestrial mammals to define the state
of sleep.
Slow (high-voltage 1â€"4-Hz) waves and spindle (high-voltage 8â€"12
Hz) waves are not by themselves conclusive evidence for sleep as
defined at the beginning of this review. They have been linked to sleep
because they generally accompany the behavioural signs of sleep in
terrestrial mammals. However, even in terrestrial mammals, certain
drugs can induce bilateral high-voltage EEG activity in individuals that
are clearly awake. Moreover, high-voltage neocortical activity is not
a required indicator of sleep; a NREM sleep state with low-voltage neocortical
activity has been documented in rodents. REM sleep is characterized
by a low-voltage EEG, indistinguishable from that of waking
in many animals.
Studies of arousal threshold have not been performed on cetaceans
across putative sleepâ€"wake cycles. Only one study has looked for sleep
rebound after EEG slow waves were prevented by disturbing cetaceans.
Although some evidence for rebound was seen, the response was
highly variable, with some animals showing little or no recovery of lost
slow waves. The amount of slow waves after deprivation bore no consistent
relation to the amount of slow-wave activity that had been lost.
Neuronal recording studies in terrestrial mammals suggest that the
axial movements occurring in cetaceans during both normal swimming
and swimming with unihemispheric slow waves are accompanied
by activation of large regions of the brainstem reticular formation.
This is quite different from the great reduction in brainstem reticular
activity that characterizes NREM sleep in terrestrial mammals.
Cetaceans deftly avoid obstacles during this constant motion, sug-
gesting accurate bilateral processing of sensory information.
If sensory and motor systems do not show typical sleep inactivation,
if behavioural and sleep rebound evidence for sleep debt is weak,
do cetaceans sleep as conventionally defined? Certainly further work
is necessary to determine which, if any, neurochemical and neurophysiological
aspects of sleep, other than unilateral neocortical slow
waves and eye closure, are preserved in cetaceans and might constitute
the ‘essence’ of sleep. Alternatively, we may need to revise our assumption
that sleep is fundamentally similar in cetaceans and terrestrial
mammals and focus on how cetaceans can dispense with some of the
most readily detectable aspects of sleep.

NATURE|Vol 437|27 October 2005 - "Clues to the functions of mammalian sleep"


Kesimpulan :  ???
Free software [knowledge] is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech', not as in 'free beer'. (fsf)

reborn

Kutip dari: peregrin pada Februari 18, 2007, 08:26:58 PM
Kesimpulan :  ???

lho kok malah nanya  ??? blom baca juga, tapi mudah2an ikan gak tidur, jadi makin terpacu utk cari cara gak usah tidur  ;D

peregrin

Kutiplho kok malah nanya  ???

lho, yg dokter fisika siapa  ???  ;D aq bingung baca "high-voltage slow waves in both hemisphere bla bla..."  ???
Free software [knowledge] is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech', not as in 'free beer'. (fsf)

reborn

Kutip dari: peregrin pada Februari 18, 2007, 08:59:01 PM
Kutiplho kok malah nanya  ???

lho, yg dokter fisika siapa  ???  ;D aq bingung baca "high-voltage slow waves in both hemisphere bla bla..."  ???

Lho katanya analytical chemist? Banyak fisikanya?  Atau anggap aja kesimpulannya mereka gak tidur dan bisa hidup, gmn  ;D

reborn

Attachmentnya itu artikel yang peregrin post di forum health yah? Apa kita harus tidur?


KutipSome smaller cetacean species are rarely, if ever, immobile. They move and avoid obstacles 24 hours a day from birth until death, even during unihemispheric slow-wave activity

KutipSlow (high-voltage 1â€"4-Hz) waves and spindle (high-voltage 8â€"12 Hz) waves are not by themselves conclusive evidence for sleep as defined at the beginning of this review. They have been linked to sleep because they generally accompany the behavioural signs of sleep in
terrestrial mammals. However, even in terrestrial mammals, certain drugs can induce bilateral high-voltage EEG activity in individuals that are clearly awake. Moreover, high-voltage neocortical activity is not a required indicator of sleep; a NREM sleep state with low-voltage neocortical
activity has been documented in rodents35. REM sleep is characterized by a low-voltage EEG, indistinguishable from that of waking in many animals.


Sama, bingung juga. Jadi belum jelas mereka tidur atau ngga yahh? Ini juga mamalia kan yahh? bentar, baca lagi. Summarynya menarik nih, thanks  ;D
Kutip
Most theories suggest a role for non-rapid eye movement (NREM) sleep in energy conservation and in nervous system recuperation. Theories of REM sleep have suggested a role for this state in periodic brain activation during sleep, in localized recuperative processes and in emotional regulation.

peregrin

KutipAttachmentnya itu artikel yang peregrin post di forum health yah? Apa kita harus tidur?

he eh, ini salah satu artikel yg kayanya menarik banget ya, soalnya membahas ttg tidur utk berbagai mamalia tmsk manusia.


Kutipbentar, baca lagi. Summarynya menarik nih, thanks   ;D

enjoy deh  ;D .. aq jd bingung sendiri hehehhehe  ;D
Free software [knowledge] is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech', not as in 'free beer'. (fsf)

DeJoko

Ikan itu perlu tidur.... :P
Hewan yang punya kelopak mata bisa ketahuan kalau sedang tidur....
Ikan 'kan nggak punya kelopak mata, jadi kita nggak tahu mereka sedang tidur....
Kelopak mata nggak perlu karena nggak takut kering (di air terus)....
Beda sama hewan yang di darat dan bisa di air juga karena punya kelopak mata dan selaput mata tambahan untuk di air....

Ini hanya logika saya aja  ;D

:-*
DeJoko

Tyd

kalo airna kotor kan bikin gatal juga di mata ??
apakah mungkin ada selaput tipis transparan  ::)

reborn


DeJoko

Kutipkalo airna kotor kan bikin gatal juga di mata ??
Tergantung kotornya....
Ada yang alamiah, ya nggak pa-pa nggak bikin gatal-gatal. Coba aja obok-obok tanah didasar kali atau sungai sehingga airnya keruh/kotor. Ini yang alamiah.... ;)
Kalau nggak alamiah artinya ada zat kimia lain yang bisa menimbulkan gatal-gatal pada mata, artinya airnya sudah tercemar. Akibatnya ikannya habis gatalan terus pada ngapung semua  ;D

Kutipapakah mungkin ada selaput tipis transparan   ::)
nggak mungkin nggak ada tapi ini pasti ada selaput tipis transparan.
Ini juga logika saya aja sih....  ;D

:-*
DeJoko

syx

ikan ga punya kelopak mata seperti kelompok binatang yg lebih tinggi derajatnya. matanya cuma dilindungi oleh semacam selaput... makanya ga ada ikan yg merem pas tidur. gejala tidur cuma terlihat dari penurunan aktivitasnya, termasuk gerakannya. ikan tertentu, seperti ikan hiu, masi tetap harus bergerak saat tidur karena kalo sampe diam dia bakal tenggelam. ini karena dia ga punya gelembung renang dalam tubuhnya yg memungkinkan dia tetep melayang dalam air.