Working memory visual array change detection responses

Description

This dataset contains the (cleaned) data which was analyzed in Rouder, Morey, Cowan, Zwilling, Morey, and Pratte (2008).

Usage

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Format

A data frame with 12345 observations on the following 36 variables.

sub

the subject number

blk

the block number

trl

the trial number within a block

prch

the log-odds of a change trial within that block

N

the visual array set size

ischange

whether the array changed or not (1=changed)

resp

whether the participant responded “change” (1=changed)

RT

the response time

probesq

which square number was probed

newcol

the color of the probed square

c1

the color of square 1

x1

the x location of square 1

y1

the y location of square 1

c2

the color of square 2

x2

the x location of square 2

y2

the y location of square 2

c3

the color of square 3

x3

the x location of square 3

y3

the y location of square 3

c4

the color of square 4

x4

the x location of square 4

y4

the y location of square 4

c5

the color of square 5

x5

the x location of square 5

y5

the y location of square 5

c6

the color of square 6

x6

the x location of square 6

y6

the y location of square 6

c7

the color of square 7

x7

the x location of square 7

y7

the y location of square 7

c8

the color of square 8

x8

the x location of square 8

y8

the y location of square 8

cor

whether the participant was correct or not

oldcol

the color of the probed square in the study array

Details

Each trial consisted of a presentation of N colored squares in an array, followed by a mask, and then a single square. The square was either the same color or a different color than the one in the same location in the first array. The participant responded “change” if they believed the square was different.

Source

Rouder, J. N., Morey, R. D., Cowan, N., Zwilling, C. E., Morey, C. C. & Pratte, M. S. (2008). An Assessment of Fixed-Capacity Models of Visual Working Memory. Proceedings of the National Academy of Sciences, 105, 5976-5979.

Examples

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data(VisualArray)
## Aggregated hit and false alarm rates
tapply(VisualArray$resp,list(VisualArray$ischange,
       VisualArray$N,VisualArray$prch),mean)