StarPlus fMRI data

This data was originally collected by Marcel Just and his colleagues in Carnegie Mellon University's CCBI. The Experiment Timing: The experiment consists of a set of trials, and the data is partitioned into trials. For some of these intervals, the subject simply rested, or gazed at a fixation point on the screen. For other trials, the subject was shown a picture and a sentence, and instructed to press a button to indicate whether the sentence correctly described the picture. For these trials, the sentence and picture were presented in sequence, with the picture presented first on half of the trials, and the sentence presented first on the other half of the trials. Forty such trials are available for each subject. The timing within each such trial is as follows: The first stimulus (sentence or picture) was presented at the begining of the trail (image=1).Four seconds later (image=9) the stimulus was removed, replaced by a blank screen.Four seconds later (image=17) the second stimulus was presented. This remained on the screen for four seconds, or until the subject pressed the mouse button, whichever came first.A rest period of 15 seconds (30 images) was added after the second stimulus was removed from the screen. Thus, each trial lasted a total of approximately 27 seconds (approximately 54 images). Imaging parameters: Images were collected every 500msec. Only a fraction of the brain of each subject was imaged. The data is marked up with 25-30 anatomically defined regions (called "Regions of Interest", or ROIs).Stimulus and behavioral data: A variety of information is available for all three data sets, including the exact sentences and pictures presented, and the subject response times. The Data: The data consists of .mat files that can be directly loaded into Matlab version 7.

本数据集最初由卡内基梅隆大学CCBI的马塞尔·贾斯特（Marcel Just）及其同事采集。实验时序：本实验包含若干试次，数据亦按试次划分。部分试次区间内，受试者仅需静息，或注视屏幕上的固定点；其余试次中，受试者将看到一张图片与一个句子，并被指示按下按钮以判断该句子是否正确描述了对应图片。此类试次中，图片与句子将依次呈现：其中半数试次先呈现图片，剩余半数试次先呈现句子。每位受试者对应40个此类试次。每个试次的具体时序如下：首个刺激物（句子或图片）于试次开始时呈现（图像编号=1）。4秒后（图像编号=9），该刺激物消失，替换为空白屏幕。又过4秒（图像编号=17），呈现第二个刺激物，该刺激物将在屏幕上停留4秒，或直至受试者按下鼠标按钮，以先发生者为准。移除第二个刺激物后，将加入一段15秒的静息时段（对应30张图像）。因此，每个试次总时长约为27秒，对应约54张图像。成像参数：图像采集间隔为500毫秒。每位受试者仅采集部分脑区的成像数据。数据标注有25至30个解剖学定义的脑区，即“感兴趣区域（Regions of Interest，ROIs）”。刺激与行为数据：三个数据集均包含多种信息，包括所呈现的精确句子与图片，以及受试者的反应时。数据集格式：本数据集包含可直接导入Matlab 7版本的.mat格式文件。