researchers at Humboldt University of Berlin have been trying to find out what
Berlin have been trying to find out what
Berlin have been trying to find out what happens in the brain when we are tickled
in 1999 scientists found young rats also
in 1999 scientists found young rats also vocalize when they’re tickled are they
vocalize when they’re tickled are they
vocalize when they’re tickled are they actually laughing what does a rat’s
actually laughing what does a rat’s
actually laughing what does a rat’s voice sound like the typical hearing
voice sound like the typical hearing
voice sound like the typical hearing range of a human is 20 Hertz to 20
range of a human is 20 Hertz to 20
range of a human is 20 Hertz to 20 kilohertz rats vocalize at twenty to a
kilohertz rats vocalize at twenty to a
kilohertz rats vocalize at twenty to a hundred kilohertz they make long calls
hundred kilohertz they make long calls
hundred kilohertz they make long calls at 22 kilohertz when they’re scared or
at 22 kilohertz when they’re scared or
at 22 kilohertz when they’re scared or annoyed and when they’re happy they make
annoyed and when they’re happy they make
annoyed and when they’re happy they make short calls at 50 kilohertz for example
short calls at 50 kilohertz for example
short calls at 50 kilohertz for example when they interact with other rats and
when they interact with other rats and
when they interact with other rats and they are given food a bit like when
they are given food a bit like when
they are given food a bit like when human voices go higher when we’re
human voices go higher when we’re
human voices go higher when we’re excited or having fun so here’s the
excited or having fun so here’s the
excited or having fun so here’s the sound a rat makes if you tickle its back
the sound has been converted to a lower
the sound has been converted to a lower frequency that we humans can hear but
frequency that we humans can hear but
frequency that we humans can hear but the source frequency is mainly 50
the source frequency is mainly 50
the source frequency is mainly 50 kilohertz apparently the rat likes being
kilohertz apparently the rat likes being
kilohertz apparently the rat likes being tickled not just because of the
tickled not just because of the
tickled not just because of the frequency of its calls but because when
frequency of its calls but because when
frequency of its calls but because when the tickling stops the rat doesn’t turn
the tickling stops the rat doesn’t turn
the tickling stops the rat doesn’t turn away but looks to see where the hand has
away but looks to see where the hand has
away but looks to see where the hand has gone rats recognise the researchers hand
gone rats recognise the researchers hand
gone rats recognise the researchers hand as their playmate and approach the hand
as their playmate and approach the hand
as their playmate and approach the hand to be tickled you more eventually they
to be tickled you more eventually they
to be tickled you more eventually they start chasing the hand rapidly while
start chasing the hand rapidly while
start chasing the hand rapidly while vocalizing at 50 kilohertz signals from
vocalizing at 50 kilohertz signals from
vocalizing at 50 kilohertz signals from the body surface reach a brain area
the body surface reach a brain area
the body surface reach a brain area called the somatosensory cortex like a
called the somatosensory cortex like a
called the somatosensory cortex like a map of the entire body with distinct
map of the entire body with distinct
map of the entire body with distinct regions for each body part trunk front
regions for each body part trunk front
regions for each body part trunk front legs back legs the researcher tickled
legs back legs the researcher tickled
legs back legs the researcher tickled the rats and measured the activity in
the rats and measured the activity in
the rats and measured the activity in the trunk region which is the most
the trunk region which is the most
the trunk region which is the most ticklish part of a rat’s body here is
ticklish part of a rat’s body here is
ticklish part of a rat’s body here is the activity of neurons in the trunk
the activity of neurons in the trunk
the activity of neurons in the trunk region when a rat is tickled thin
region when a rat is tickled thin
region when a rat is tickled thin vertical lines indicate electrical
vertical lines indicate electrical
vertical lines indicate electrical activity in the new
activity in the new
activity in the new retinal cells
signals from the trunk are being sent to
signals from the trunk are being sent to this brain region does this neural
this brain region does this neural
this brain region does this neural activity represent ticklishness if it is
activity represent ticklishness if it is
activity represent ticklishness if it is the case activation of these neurons
the case activation of these neurons
the case activation of these neurons without actually tickling the body must
without actually tickling the body must
without actually tickling the body must be enough for the rat to feel ticklish
be enough for the rat to feel ticklish
be enough for the rat to feel ticklish to test it the researcher stimulated the
to test it the researcher stimulated the
to test it the researcher stimulated the neurons electrically
the rat emits short calls at 50
the rat emits short calls at 50 kilohertz when it’s brain is stimulated
kilohertz when it’s brain is stimulated
kilohertz when it’s brain is stimulated thus the researcher found out that
thus the researcher found out that
thus the researcher found out that ticklishness is represented by activity
ticklishness is represented by activity
ticklishness is represented by activity of the neurons in the somatosensory
of the neurons in the somatosensory
of the neurons in the somatosensory cortex I am worried that a lot of these
cortex I am worried that a lot of these
cortex I am worried that a lot of these guys are disappearing and nowhere else
guys are disappearing and nowhere else
guys are disappearing and nowhere else on earth dis dis organism exists you
on earth dis dis organism exists you
on earth dis dis organism exists you have to go to the backs of valleys or
have to go to the backs of valleys or
have to go to the backs of valleys or distant Ridge lines or isolated mountain
distant Ridge lines or isolated mountain
distant Ridge lines or isolated mountain ranges
”
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