ERP (version 1.0.1)

erpcz: ERP dataset from a directed forgetting experiment as presented in detail in Sheu, Perthame, Lee and Causeur (2014)

Description

The experiment was conducted using an experimental paradigm similar to that described in Lee, Lee and Fawcett (2013). The objective of the study was to examine the electrophysiological process associated with directed forgetting.

Usage

data(erpcz)

format

40 ERP curves obtained at electrode CZ for 20 subjects in two experimental conditions (TBR and TBF), each curve lasting for one thousand milliseconds (ms) with one record per 4ms. The last two columns, Subject and Instruction, provide the subject identifier and the group membership respectively.

source

Sheu, C.-F., Perthame, E., Lee Y.-S. and Causeur, D. 2014. Accounting for time dependence in large-scale multiple testing of event-related potential data. Submitted.

Details

In the study phase of the experiment, 20 participants were instructed (with a `+' or `X' cue, respectively) to either remember or forget a stimulus word that was presented on a computer screen. ERPs were recorded throughout each of 90 trials - half for to-be-remembered (TBR) and half for to-be-forgotten (TBF). ERPs from nine electrode positions - 3 each from frontal, central and posterior regions - during the study phase were analyzed. The curent dataset provides the ERP curves at electrode CZ (central on the miline). The corresponding experimental covariates (subject and instruction) are provided in the last two columns.

References

Lee, Y-S., Lee, H.M., Fawcett, J.-M. (2013). Intentional forgetting reduces color-naming interference: evidence from item-method directed forgetting. Journal of Experimental Psychology. Learning, Memory and Cognition, 39 (1), 220-236.

Examples

data(erpcz)
erpplot(erpcz[,1:251],frames=seq(0,1001,4),xlab="Time (ms)",
   ylab="ERP",main="ERP at electrode CZ")