2007年1月20日

fMRI program: cluster analysis
find cluster-> using "showCorrelationResult" and
save clusterResultXXX clusterMap cluster
mark cluster with diff color and cluster info -> getClusterMap
cluster output (for mrGray) -> showMultiMap
<Trouble in fMRI data analysis>
LPP data was combined of 0411 and 0425 which 0411 Run #10 (Prox 100) was transfered to 0425 as Run #7.
But somehow, the original and normalized slices were not matched in Folder 060425m
The solution is to discard all the data of 060425m and recombine 0411 and 0425, redo the average and all the more!!!
Now the dataDir is 060425
T1 anatomy of Run #7 in 060425 was that of 060411
AND
LWJ's scan list was confused.

Neural mechanisms for perceptual organization based on color and shape similarity revealed by fMRI

Neural mechanisms for perceptual organization based on color and shape similarity revealed by fMRI

Chang, Hsiao-Chueh; Chen, Chien-Chung; Hsu, Chia-Hung; Chen, Jyn Horng
Department of Psychology, National Taiwan University
MRI Lab., National Taiwan University


Objective. Visual elements with similar properties tend to be grouping together. We investigated the neural mechanisms fore Gestalt principles of similarity and examined whether grouping processes based on different element properties share the same neural mechanisms by using fMRI.
Method. The test stimuli consisted of 6 by 6 elements in different color (red/green) or shape (circle/square). In the color condition, elements with the same color were arranged into columns or rows. In the shape condition, elements with the same shape were arranged into columns or rows. In the compound condition, elements were arranged by both similar color and shape. The control stimuli consisted of elements randomly distributed in the 6 by 6 array regardless of their color or shape. Each of the three block-design runs had one test condition alternating with the control condition in 36s period. The BOLD activation for each subjects was collected on a Brucker 3T magnet (EPI, TR=3s, TE=35ms, flip angle = 90 deg.)
Results. The color condition activated inferior temporal (IT), superior frontal gyrus (SFG), middle frontal gyrus and angular gyrus (AG). The shape condition activated middle occipital gyrus (MOG), AG, SFG and insula. The compound condition activated MOG, IT, SFG and AG.
Conclusion. In all condition, both AG and SFG were activated. Our results suggested that these areas were involved in general processes of grouping by similarity. The color similarity activated IT but not MOG while the shape similarity had an opposite effect. This suggests that there are different neural mechanisms for grouping by similarity based on different element properties.

Supported by NSC 92-2413-H-002-027

Ref Bank

This is mainly for lab notes, references, and other work logs.
It would be much powerful and convenient to work with Google Docs and Spreadsheets!