Lawson English
2006-08-12 00:30:12 UTC
Just finished watching one of the video-taped seminars hosted by IBM on
"cognitive neuroscience." Specifically,
http://video.google.com/videoplay?docid=-2874207418572601262&q=visual+cortex
, which describes attempts to model the interactions of a group of
10,000 neurons in the brain. An interesting new model was proposed that
gives primary importance to the topology of the connections of the
neurons, rather than to the electrical-chemical interactions between
them. It turns out that there is an extremely precise "key/keyhole"
aspect to how brain neurons interconnect. Neurons only connect with
other neurons in well-defined ways that are determined by the type of
neuron AND by the type of ion-channel that they manifest at various
locations on their respective dendrites. This precise connectivity is
seen as encoding the information contained in the network, and the
action potentials of the neurons primarily serve to "animate" or modify
the connectivity, as opposed to the usual model where these potentials
serve to send information from one neuron to the next.
When you add to this the new finding that TM practice tends to reduce
the activity of the thalamus, thereby reducing the activity of the
thalamo-cortical feedback loops that actually give rise to the
high-level processing of sensory input (and possibly "thought itself"),
there's the possibility that TM leaves the various parts of the brain to
engage in activity based only on their own local connectivity without
any kind of outside input. It is conceivable that the mantra serves as
the last "external" stimulus to these local circuits and that that will
help determine what these self-interacting processes actually do as they
are increasingly left "on their own."
In other words, the effect of a specific mantra may become quite
important in this situation, as opposed to during normal waking-state
thought processes. TM mantras apparently are selected according to the
age a person learns and/or gender, and this may actually help determine
what effect the use of the mantra may have in the long-term changes of
connectivity due to the experience of "transcendental consciousness,"
which is associated with the reduction in thalamic activity during TM.
Certainly age and gender are known to have effects on neural processes
in general, so basing mantra selection on age and gender doesn't require
some radical shift in our understanding of the brain to explain the
potential relevance of this traditional selection-process.
Just some rambling thoughts.
"cognitive neuroscience." Specifically,
http://video.google.com/videoplay?docid=-2874207418572601262&q=visual+cortex
, which describes attempts to model the interactions of a group of
10,000 neurons in the brain. An interesting new model was proposed that
gives primary importance to the topology of the connections of the
neurons, rather than to the electrical-chemical interactions between
them. It turns out that there is an extremely precise "key/keyhole"
aspect to how brain neurons interconnect. Neurons only connect with
other neurons in well-defined ways that are determined by the type of
neuron AND by the type of ion-channel that they manifest at various
locations on their respective dendrites. This precise connectivity is
seen as encoding the information contained in the network, and the
action potentials of the neurons primarily serve to "animate" or modify
the connectivity, as opposed to the usual model where these potentials
serve to send information from one neuron to the next.
When you add to this the new finding that TM practice tends to reduce
the activity of the thalamus, thereby reducing the activity of the
thalamo-cortical feedback loops that actually give rise to the
high-level processing of sensory input (and possibly "thought itself"),
there's the possibility that TM leaves the various parts of the brain to
engage in activity based only on their own local connectivity without
any kind of outside input. It is conceivable that the mantra serves as
the last "external" stimulus to these local circuits and that that will
help determine what these self-interacting processes actually do as they
are increasingly left "on their own."
In other words, the effect of a specific mantra may become quite
important in this situation, as opposed to during normal waking-state
thought processes. TM mantras apparently are selected according to the
age a person learns and/or gender, and this may actually help determine
what effect the use of the mantra may have in the long-term changes of
connectivity due to the experience of "transcendental consciousness,"
which is associated with the reduction in thalamic activity during TM.
Certainly age and gender are known to have effects on neural processes
in general, so basing mantra selection on age and gender doesn't require
some radical shift in our understanding of the brain to explain the
potential relevance of this traditional selection-process.
Just some rambling thoughts.