Keji Li's place

Grandmother cell not very disprovable

One objection to localized coding (grandmother cell) is that you can't find it anyway. Well, not so, because a localized coding system will almost always manifest as a sparse coding system (or even highly distributed), given a hierarchical model.

In this example, if you are looking for Jennifer Anniston cell, but your electrodes are in stage -1 or stage 1, you will always get multiple clusters responding to your Anniston picture.

"Blond" is probably a poor example here because 1) this classifier is probably still far away from the final stage of face recognition, 2) you can't mistake it to be Anniston detector, since you almost certainly have multiple blond people in your stimulus set. However, we already see the "Friends" detector working in the original paper. Furthermore, if the area they are in is actually in the same dimension as 'famous sitcom' then you can indeed find clusters that respond to "Friends".

Now, for the lesion argument, if you can't find it anyway, why would you expect to lost it?

SQLAlchemy, A short tutorial

Some obscure points to note when using sqlalchemy:

  1. if you want to use numpy or your engine is sqlite, use Float columns instead of Numeric columns
  2. you can change your database defining script and have it run as long as the changes don't affect the tables, i.e.: change ...
read more

Bibpdf, a simple reference manager

This is a paper management system that is light (and easy to change) but with some important features others lack. It is supposed to be used with bibtex only, but should work with anything that eats .bib files. The database I use is sqlite, but should work with whichever of your choice (require python interface) with minimal change of the code. The database structure is in 'paper_db.sql'. The script to interact with the database is in 'pdf.' file, rename it anyway you like and put in a folder easy to work in or a folder python can find. Change the paths at the beginning of the file to your corresponding paths. If you are in windows, change the first line to the python path. read more

A common pulvinar retinotopic organization for primate species

There just need to be a post on my recently accepted paper: Pulvinar Retinotopy of a Prosimian (bush baby) read more