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The Biological Basis of Learning and Individuality

    Elementary aspects of the neuronal mechanisms important for several different types of learning can now be studied on the cellular and even on the molecular level. Researchers agree that [some] forms of learning and memory require a conscious record. These types of learning are commonly called declarative or explicit. Those forms of learning that do not utilize conscious participation are referred to as non-declarative or implicit.

    Explicit learning is fast and may take place after only one training trial. It often involves association of simultaneous stimuli and permits storage of information about a single event that happens in a particular time and place; it therefore affords a sense of familiarity about previous events. In contrast, implicit learning is slow and accumulates through repetition over many trials. It often involves association of sequential stimuli and permits storage of information about predictive relations between events. Implicit learning is expressed primarily by improved performance on certain tasks without the subject being able to describe just what has been learned, and it involves memory systems that do not draw on the contents of the general knowledge of the individual.

    The existence of two distinct forms of learning has caused the reductionists among neurobiologists to ask whether there is a representation on the cellular level for each of these two types of learning process. Canadian psychologist Donald O. Hebb boldly suggested that associative learning could be produced by a simple cellular mechanism. He proposed that associations could be formed by coincident neural activity: “When an axon of cell A ... excite[s] cell B and repeatedly or persistently takes part in firing it, some growth process or metabolic change takes place in one or both cells such that A’s efficacy, as one of the cells firing B, is increased.” According to Hebb’s learning rule, coincident activity in the presynaptic and postsynaptic neurons, is critical for strengthening the connection between them (a so-called pre-post associative mechanism).

(Scientific American, julho de 2014.)

Five stranded snorkellers rescued from tiny island off Australia after their huge SOS message was spotted by helicopter.

(Adam Withnall / Wednesday 23 April 2014)

    Five snorkellers stranded on a tiny island off
the east coast of Australia have been rescued after
scrawling a giant SOS message into a nearby
sandbank.

[05]    The group had been stuck out at sea for more
than nine hours after their boat’s anchor failed and
it drifted away. 

    They had been swimming around a remote
sandbar near Wigton Island, Queensland, when the
[10] vessel started shifting - with their mobile phones,
clothes, water and sunscreen all still on board – and
it had moved beyond reach before they had time to
react. 

    Speaking to the Courier-Mail about the ordeal
[15] yesterday, Lyn Forbes-Smith described how she, a
female friend and three male friends were facing
the prospect of a long, cold night surrounded by
ocean when they finally spotted an approaching
rescue helicopter. 

  [20]   “We had sort of made plans about what we’d
do on the rock for the evening,” she said.

    “We had reef walkers on thankfully, but we
had no food, water, cream, no hats, not much at all.
We just looked for the highest ground, we looked
for rocks where five of us could huddle together
[25] because we didn’t really want to separate, and we
wanted to be out of the wind as best as possible.” 

    Ms Forbes-Smith explained that they were
concerned the sandbar – and their message – would
[30] go under with the tide, but that they were
“reasonably confident” someone would come
looking when friends realised they had not
returned.

    The group had set off from Keswick Island
[35] towards Wigton Island at around 8am for the
snorkelling trip, and it was around 5pm when they
first saw signs of help approaching.

    Another member of the group, Craig Gilbert,
told ABC News of their joy at spotting an RACQ
[40] rescue helicopter. 

    “We saw the helicopter and we thought, 'Oh,
you beauty' - and then it disappeared and we
thought, 'Oh no - we better look out for our beds
for the night' - then it came back probably 20
minutes later,” he said. 

    Rescue helicopter crew member Damien
[45] Kross said the five were treated for sunburn and
dehydration, but were otherwise “fine”. 

    “They were a little bit dehydrated but we
winched them to safety and brought them back here
to Mackay on the mainland] for just to have a
[50] quick medical attention and they were all fine.” 

(Adapted from The Independent / Friday 11 July 2014)

Five stranded snorkellers rescued from tiny island off Australia after their huge SOS message was spotted by helicopter.

(Adam Withnall / Wednesday 23 April 2014)

    Five snorkellers stranded on a tiny island off
the east coast of Australia have been rescued after
scrawling a giant SOS message into a nearby
sandbank.

[05]    The group had been stuck out at sea for more
than nine hours after their boat’s anchor failed and
it drifted away. 

    They had been swimming around a remote
sandbar near Wigton Island, Queensland, when the
[10] vessel started shifting - with their mobile phones,
clothes, water and sunscreen all still on board – and
it had moved beyond reach before they had time to
react. 

    Speaking to the Courier-Mail about the ordeal
[15] yesterday, Lyn Forbes-Smith described how she, a
female friend and three male friends were facing
the prospect of a long, cold night surrounded by
ocean when they finally spotted an approaching
rescue helicopter. 

  [20]   “We had sort of made plans about what we’d
do on the rock for the evening,” she said.

    “We had reef walkers on thankfully, but we
had no food, water, cream, no hats, not much at all.
We just looked for the highest ground, we looked
for rocks where five of us could huddle together
[25] because we didn’t really want to separate, and we
wanted to be out of the wind as best as possible.” 

    Ms Forbes-Smith explained that they were
concerned the sandbar – and their message – would
[30] go under with the tide, but that they were
“reasonably confident” someone would come
looking when friends realised they had not
returned.

    The group had set off from Keswick Island
[35] towards Wigton Island at around 8am for the
snorkelling trip, and it was around 5pm when they
first saw signs of help approaching.

    Another member of the group, Craig Gilbert,
told ABC News of their joy at spotting an RACQ
[40] rescue helicopter. 

    “We saw the helicopter and we thought, 'Oh,
you beauty' - and then it disappeared and we
thought, 'Oh no - we better look out for our beds
for the night' - then it came back probably 20
minutes later,” he said. 

    Rescue helicopter crew member Damien
[45] Kross said the five were treated for sunburn and
dehydration, but were otherwise “fine”. 

    “They were a little bit dehydrated but we
winched them to safety and brought them back here
to Mackay on the mainland] for just to have a
[50] quick medical attention and they were all fine.” 

(Adapted from The Independent / Friday 11 July 2014)

Five stranded snorkellers rescued from tiny island off Australia after their huge SOS message was spotted by helicopter.

(Adam Withnall / Wednesday 23 April 2014)

    Five snorkellers stranded on a tiny island off
the east coast of Australia have been rescued after
scrawling a giant SOS message into a nearby
sandbank.

[05]    The group had been stuck out at sea for more
than nine hours after their boat’s anchor failed and
it drifted away. 

    They had been swimming around a remote
sandbar near Wigton Island, Queensland, when the
[10] vessel started shifting - with their mobile phones,
clothes, water and sunscreen all still on board – and
it had moved beyond reach before they had time to
react. 

    Speaking to the Courier-Mail about the ordeal
[15] yesterday, Lyn Forbes-Smith described how she, a
female friend and three male friends were facing
the prospect of a long, cold night surrounded by
ocean when they finally spotted an approaching
rescue helicopter. 

  [20]   “We had sort of made plans about what we’d
do on the rock for the evening,” she said.

    “We had reef walkers on thankfully, but we
had no food, water, cream, no hats, not much at all.
We just looked for the highest ground, we looked
for rocks where five of us could huddle together
[25] because we didn’t really want to separate, and we
wanted to be out of the wind as best as possible.” 

    Ms Forbes-Smith explained that they were
concerned the sandbar – and their message – would
[30] go under with the tide, but that they were
“reasonably confident” someone would come
looking when friends realised they had not
returned.

    The group had set off from Keswick Island
[35] towards Wigton Island at around 8am for the
snorkelling trip, and it was around 5pm when they
first saw signs of help approaching.

    Another member of the group, Craig Gilbert,
told ABC News of their joy at spotting an RACQ
[40] rescue helicopter. 

    “We saw the helicopter and we thought, 'Oh,
you beauty' - and then it disappeared and we
thought, 'Oh no - we better look out for our beds
for the night' - then it came back probably 20
minutes later,” he said. 

    Rescue helicopter crew member Damien
[45] Kross said the five were treated for sunburn and
dehydration, but were otherwise “fine”. 

    “They were a little bit dehydrated but we
winched them to safety and brought them back here
to Mackay on the mainland] for just to have a
[50] quick medical attention and they were all fine.” 

(Adapted from The Independent / Friday 11 July 2014)

Five stranded snorkellers rescued from tiny island off Australia after their huge SOS message was spotted by helicopter.

(Adam Withnall / Wednesday 23 April 2014)

    Five snorkellers stranded on a tiny island off
the east coast of Australia have been rescued after
scrawling a giant SOS message into a nearby
sandbank.

[05]    The group had been stuck out at sea for more
than nine hours after their boat’s anchor failed and
it drifted away. 

    They had been swimming around a remote
sandbar near Wigton Island, Queensland, when the
[10] vessel started shifting - with their mobile phones,
clothes, water and sunscreen all still on board – and
it had moved beyond reach before they had time to
react. 

    Speaking to the Courier-Mail about the ordeal
[15] yesterday, Lyn Forbes-Smith described how she, a
female friend and three male friends were facing
the prospect of a long, cold night surrounded by
ocean when they finally spotted an approaching
rescue helicopter. 

  [20]   “We had sort of made plans about what we’d
do on the rock for the evening,” she said.

    “We had reef walkers on thankfully, but we
had no food, water, cream, no hats, not much at all.
We just looked for the highest ground, we looked
for rocks where five of us could huddle together
[25] because we didn’t really want to separate, and we
wanted to be out of the wind as best as possible.” 

    Ms Forbes-Smith explained that they were
concerned the sandbar – and their message – would
[30] go under with the tide, but that they were
“reasonably confident” someone would come
looking when friends realised they had not
returned.

    The group had set off from Keswick Island
[35] towards Wigton Island at around 8am for the
snorkelling trip, and it was around 5pm when they
first saw signs of help approaching.

    Another member of the group, Craig Gilbert,
told ABC News of their joy at spotting an RACQ
[40] rescue helicopter. 

    “We saw the helicopter and we thought, 'Oh,
you beauty' - and then it disappeared and we
thought, 'Oh no - we better look out for our beds
for the night' - then it came back probably 20
minutes later,” he said. 

    Rescue helicopter crew member Damien
[45] Kross said the five were treated for sunburn and
dehydration, but were otherwise “fine”. 

    “They were a little bit dehydrated but we
winched them to safety and brought them back here
to Mackay on the mainland] for just to have a
[50] quick medical attention and they were all fine.” 

(Adapted from The Independent / Friday 11 July 2014)

Five stranded snorkellers rescued from tiny island off Australia after their huge SOS message was spotted by helicopter.

(Adam Withnall / Wednesday 23 April 2014)

    Five snorkellers stranded on a tiny island off
the east coast of Australia have been rescued after
scrawling a giant SOS message into a nearby
sandbank.

[05]    The group had been stuck out at sea for more
than nine hours after their boat’s anchor failed and
it drifted away. 

    They had been swimming around a remote
sandbar near Wigton Island, Queensland, when the
[10] vessel started shifting - with their mobile phones,
clothes, water and sunscreen all still on board – and
it had moved beyond reach before they had time to
react. 

    Speaking to the Courier-Mail about the ordeal
[15] yesterday, Lyn Forbes-Smith described how she, a
female friend and three male friends were facing
the prospect of a long, cold night surrounded by
ocean when they finally spotted an approaching
rescue helicopter. 

  [20]   “We had sort of made plans about what we’d
do on the rock for the evening,” she said.

    “We had reef walkers on thankfully, but we
had no food, water, cream, no hats, not much at all.
We just looked for the highest ground, we looked
for rocks where five of us could huddle together
[25] because we didn’t really want to separate, and we
wanted to be out of the wind as best as possible.” 

    Ms Forbes-Smith explained that they were
concerned the sandbar – and their message – would
[30] go under with the tide, but that they were
“reasonably confident” someone would come
looking when friends realised they had not
returned.

    The group had set off from Keswick Island
[35] towards Wigton Island at around 8am for the
snorkelling trip, and it was around 5pm when they
first saw signs of help approaching.

    Another member of the group, Craig Gilbert,
told ABC News of their joy at spotting an RACQ
[40] rescue helicopter. 

    “We saw the helicopter and we thought, 'Oh,
you beauty' - and then it disappeared and we
thought, 'Oh no - we better look out for our beds
for the night' - then it came back probably 20
minutes later,” he said. 

    Rescue helicopter crew member Damien
[45] Kross said the five were treated for sunburn and
dehydration, but were otherwise “fine”. 

    “They were a little bit dehydrated but we
winched them to safety and brought them back here
to Mackay on the mainland] for just to have a
[50] quick medical attention and they were all fine.” 

(Adapted from The Independent / Friday 11 July 2014)