Re: Images in the brain of the dead was RE: Where the I is

From: Anders Sandberg (asa@nada.kth.se)
Date: Sun Feb 16 2003 - 14:10:10 MST

  • Next message: John K Clark: "Re: Giant anti-war demonstration in Melbourne"

    On Sat, Feb 15, 2003 at 11:56:52PM -0500, Rafal Smigrodzki wrote:
    >
    Avatar:
    > > I have read previously that images are stored as 2 d pictures in the brain's
    > > 3 d matrix. Personally I don't think the brain remembers a great deal after
    > > 3 years. It tends to act functionally and requires re-learning of specifics
    > > data.
    >
    > ### Pictures are not stored as 2D images. The ability to recognize
    > previously seen images is distributed over a wide range of cortical fields,
    > including the exastriate cortices, parietal and even frontal cortex. The
    > engram is probably a pattern of synaptic strength modifications, similar to
    > LTP and LTD, as well as synaptic neogenesis and pruning.

    Yes, I agree. But to add a bit more, in V1 and a few other places there
    is a retinotopic representation in the cortex. On the cortical sheet
    (which is a few milimeters thick and heavily folded, so there is a bit
    of 3D there) the retinal image ends up as a 2D map, with quite a bit of
    distortion but the same topology. This may have been what Avatar talked
    about originally. 

    -- 
-----------------------------------------------------------------------
Anders Sandberg                                      Towards Ascension!
asa@nada.kth.se                            http://www.nada.kth.se/~asa/
GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y

    This archive was generated by hypermail 2.1.5 : Sun Feb 16 2003 - 14:08:53 MST