Posted on Thu 22 March 2018 in Neuroscience • Tagged with SPM, fmri, neuroscience, matlab, programming
I've posted to my github code for a MATLAB class, BrainPlot, to plot out brain plots à la J.D. Power's paper A simple but useful way to assess fMRI scan qualities, to be used in conjunction with a first-level SPM analysis. The plot is useful to identify various artifacts …
Posted on Wed 03 January 2018 in Neuroscience • Tagged with SPM, PPI, neuroscience, fmri, programming, ROI, matlabbatch
A psycho-physiological interactions (PPI) analysis of fMRI data requires that some kind of region of interest be extracted from a subject-level contrast of interest. For small studies of only a few participants, manually extracting these ROIs using SPM's GUI is simple enough, but for larger studies, SPM's batch processing capabilities …
Posted on Fri 12 April 2013 in Rumination • Tagged with economics, heterogeneity, models, systems
[reposted from deadvoles.wordpress.com/]
Social systems are dynamic, internally heterogeneous, and loosely coupled. Some may object to my use of the term ‘system’ and certainly the word has a lot of baggage. By calling something a system, I am merely drawing attention to the fact that it admits descriptions …
Posted on Mon 12 December 2011 in Situation Theory • Tagged with information theory, semantic information, situation semantics, situation theory
A common problem facing those interested in learning about situation theory and situation semantics for the first time is knowing where to begin. The goal of this blog post is to save my readers as much time and effort as possible by pointing them to the key references in the …
Posted on Fri 28 October 2011 in Situation Theory • Tagged with channel theory, information, information flow, situation semantics, situation theory
Lee, Jacob. 2011. Situation Theory: a survey. Master’s Thesis, Fresno, California: California State University Fresno.
Situation semantics was developed as an alternative to possible-worlds semantics. While possible-worlds semantics defines the informational content of sentences in terms of complete descriptions of the way the world is or might be …
Posted on Tue 27 September 2011 in Situation Theory • Tagged with situation theory
John Sowa writes:
Theories of semantics based on possible worlds cannot derive purpose or intention from collections of worlds, no matter how big, or from collections of situations, no matter how small. In their theory of situations, Barwise and Perry (1983) tried to use finite situations rather than infinite worlds …
Posted on Mon 06 June 2011 in Situation Theory • Tagged with channel theory, information flow, situation theory
The channel theory of Jeremy Seligman and Jon Barwise [1] is intended to help us understand information flows of the following sort: a's being F carries the information that b is G. For example, we might want a general framework in which understand how a piece of fruit's bitterness …
Posted on Thu 17 February 2011 in Rumination • Tagged with fono, information flow
Idealized spatial organization of the fono
A fono is a political meeting in the Western Somoan village. The fono is a spatially organized event: high ranking orators are seated in the front, low ranking orators and other low status and low rank persons in the …
Posted on Mon 24 January 2011 in Rumination • Tagged with information flow, social networks
I am caught in a maelstrom of work and so I decide to play.
I have an excellent textbook on discrete mathematics on my shelf from a course I took as a student a few years ago [1]. Its always useful to review such books to remind oneself of certain …
Posted on Tue 14 December 2010 in Rumination • Tagged with diffusion, information, semiotics, social networks
Social diffusion processes, real and alleged, have been the focus of intense study for many years, reaching into the early days of anthropology. Because so many different things can be thought to diffuse or flow through a population-- culture, ideas, practices, behaviors, technologies and innovations, opinions, commodities, money, influence, diseases …