Virtual EEG Lab

This program is a virtual EEG (electroencephalogram) lab. In the EEG literature there are lots of experiments that compare objects, such as comparing faces to butterflys, birds to dogs, etc. Their goal is to determine how the brain processes different kinds of objects.

You can use this program to do something similar. We have collected the brain responses from a large number of subjects while they viewed the images below. You can use this program to group the pictures into different categories, and run your own experiment. In fact, there are almost 250,000 different ways to group these stimuli into the six categories, and so it's likely that your own virtual experiment has never been run and you might discover something that we didn't know about how the brain processes visual images.

To run your own experiment, first scan through the pictures to get an idea of what you'd like to compare. Note that we tried to include a wide range of stimuli, both positively and negatively arousing, and included a lot of people pictures. None of them are revealing but some of them are provocative. This program should be used with adult supervision for users under the age of 18

You might compare things like animals vs. people. To use this as an example, lets assume that Animals will be our first category. Type Animals into the text box next to Category 1 below, and this name will show up on our graphs. Next, go through the list of 256 images and find all those that contain animals. This might seem like a lengthy processes, but it's a lot faster than actually running the experiment in an EEG lab! For each of the animal pictures, select the radio button that assigns that picture to your category that you've assigned to animals (One).

Next, type People into the Category 2 text box and go through and find all the pictures that contain people. Select the 'Two' radio button next to each pictures containing a person.

Once you've assigned pictures to each of your categories, click the submit button. Your groupings will be submitted to our server, and after a 30-60 second wait your results should appear. What we're doing is taking the brain responses from each picture and averaging them together to come up with a brain response that is specific to your two categories. You'll see these on the window that opens up. Read the instructions on that page to figure out how to interpret your results and make changes.

Enter a title for your Graphs:

Please enter the names of the category to be used: (e.g. Animals or People)

Category 1	Category 2	Category 3
Category 4	Category 5	Category 6

Start Time for Plots

End Time for Plots

(Range Should be of 1 Msec; new users can leave these alone)

Choose a split based on the following categories: (new users should choose No Split)

Note that if you split the data you can only have up to 3 categories.

No Split Gender 1st Vs 2nd Run 1st vs 2nd repetition within a run

Compare Conditions

Channel for Statistics

Alpha Level

(This is an advanced option that will help you figure out where the differences are actually significantly different. To get started, run it once without this before selecting a channel. By selecting one channel above, the program will highlight time regions that produced significant differences using an Analysis of Variance. To use this feature, at least 1 of your categories must have more than 1 picture.)

Choose the resolution for your graphs

Low Resolution

High Resolution (takes longer to create and download, but individual graphs can be viewed up close)

To use a predefined Category as one your Categories:

If you'd like to get started quickly, you can use some of the pre-defined categories above to do some initial selections. We've pre-defined some properties of the pictures, and you can use this to get started. To assign all pictures of a particular type (for example, all animals) to one of your 6 categories, use the left pop-up menu to tell the program which category you'd like to change, and then use the menu on the right to tell the program which type of grouping you'd like to assign to that category. Right now the defaults are to assign all animal pictures to category 1. Once you've made your selection, hit the change button and then verify that the radio buttons were changed. Note that each picture can only be in one category, but you don't have to assign a category to each picture, nor do you have to use all 6 categories. In fact, starting out with just 2 categories is a good way to get started.

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Choose to make your graphs consider all the raw data or some of the components given below:

(To know more on Components Click Here)

Note: If you try to both split the data on gender, run or repetion and try to do components, the program will ignore your split. The two are mutually exclusive.

Raw Data (Raw Data would select all 16 components given below)

Select Components

Component 1	No	yes
Component 2	No	yes
Component 3	No	yes
Component 4	No	yes
Component 5	No	yes
Component 6	No	yes
Component 7	No	yes
Component 8	No	yes
Component 9	No