ERP PCA Toolkit / Discussion / Help: Error in the Window module during Temporal PCA

Hi Dr. Dien,

I am writing to ask for your assistance as I have encountered some difficulties while attempting to perform a temporal PCA using participants and conditions as observations. My experimental design consists of 3 groups and 4 conditions.

Currently, I have NeuroScan .avg files for each individual participant, averaged separately for each of the four conditions (i.e., Total files = Number of Participants × 4).

To briefly explain the procedure I followed: Based on the tutorial, I created a combined data file (.ept) using the Average module from the .avg files. I used the following settings: In: Neuroscan, Type: average, and Trial SD: none. For the Subject field, I entered the character indices for parsing (e.g., I entered 1:3 for a filename structure like 001_group_condition).

I successfully ran the PCA with this combined data and inspected the factors using the View module. However, the issue arises subsequently. Whenever I attempt to access the Window module, the following error occurs repeatedly:

Error Message: Could not find the channel for some reason. Array indices must be positive integers or logical values. Error in ep (line 6932) EPmain.window.dataset=EPmain.window.aveData(end); %the active dataset Error in ep (line 1577) ep('startWindow'); Error while executing DestroyedObject Callback

Even after initializing and restarting the toolkit, I am unable to proceed to the Window stage. I would greatly appreciate your insights on why this might be happening and how I might resolve it.

Thank you.
Minsun Kim

Error in the Window module during Temporal PCA

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Error in the Window module during Temporal PCA