Data and Analysis Unit: PLYM7

Description

Citation

The APA-format citation for this resource is: Wills, A.J. (2014). Data and Analysis Unit: PLYM7. Retrieved from http://www.willslab.co.uk/plym7

If you make use of these resources, please drop me an email: andy@willslab.co.uk.

Resources

• plym7data.txt (514 KB) - Trial-level raw data. Column headings are as follows:
  • date: Day of testing in YYYY-MM-DD format
  • cond: Experimental condition (1 = concurrent load, 2 = full attention)
  • subj: Participant ID (unique within PLYM7)
  • cb: Stimulus randomization condition (1-8, see plym7cb.txt)
  • phase: Experiment phase (1 = practice, 2 = training, 3 = test). Full-attention condition starts with phase 2.
  • blk: Block (Ranges from 1 to 3 in phase 2, and 1 to 8 in phase 3)
  • trial: Trial number (resets for each block)
  • stim: Stimulus ID (see plym7code.txt)
  • resp: Phase-specific response code
    • Training phase, concurrent load condition: The number entered by the participant for the counting task.
    • Training phase, full attention: Dummy entry, always set to 1.
    • Test phase (either condition): Choice ( 1 = the 1111 category, 0 = the 0000 category )
  • rt: Reaction time in milliseconds
  • corrcount: Correct answer on digit task.
• plym7analysis.R (1 KB) - R script for analyses reported in Wills, Inkster, Milton (submitted). This script can be run by the command source('plym7analysis.R'), or can be run interactively. Requires plym7cap.R
• plym7cap.R (6 KB) - R script containing a single function that performs all analyses required in PLYM7. This allows variant analyses (e.g. with or without participant exclusions) to be run without code duplication. This is NOT a portable function, it makes use of global variables and will only work unmodified in the context of these specific experiments.
• plym7logistic.R (3 KB) - R script for logistic regression analyses reported in the Supplementary Materials of Wills, Inkster, Milton (submitted). This script can be run by the command source('plym7analysis.R'), or can be run interactively.
• plym7code.txt (1 KB) - The main purpose of this file is to facilitate automated analysis of plym7data.txt by plym7analysis.R. Column headings are as follows:
  • stim.number: Stimulus ID (as used in plym7data.txt)
  • stim.type: Logical stimulus code. The four digits are the values of the four stimulus dimensions (left to right, D1-D4). The final 's' has no meaning, it's there to ensure the four digits are parsed by R scripts as a string rather than as a number. In all stimulus randomization conditions, the stim.type code (and thus also the stimulus ID) represents the stimulus in canonical form (i.e. with D1 as criterial, D2-D4 as noncriterial, and with 1111 and 0000 as the category prototypes). Thus stimulus ID 1-4 are category 1111 training stimuli, ID 5-8 are category 0000 training stimuli, ID 9-10 are the 'critical' test stimuli, and ID 11-16 are the other test stimuli.
  • fr: The response predicted by an Overall Similarity response model (1 = category 1111, 0 = category 0000, 0.5 = no prediction).
  • ca: The response predicted by a Critierial Attribute response model.
  • nca1: The response predicted by a Noncriterial Attribute response model acting on D2
  • nca2: The response predicted by a Noncriterial Attribute response model acting on D3
  • nca3: The response predicted by a Noncriterial Attribute response model acting on D4
  • lk: The response predicted by an 'alway press the left key' response model.
  • rk: The response predicted by an 'alway press the right key' response model.
• plym7cb.txt (1 KB) - Specification of stimulus randomization conditions. Each column represents one of the 16 conditions (cb in plym7data.txt). Each row represents a stimulus ID (stim in plym7data.txt). Each cell gives the physical stimulus presented for a particular cb condition and stimulus ID. Note: The column titles (e.g. "cb5:R2D34") give the value of cb (5 in this example) and then describe the operation required to get from the canonical structure (cb = 1) to this structure. "R" means rotate. Specifically, R1 means rotate left once i.e. all four digits in the stimulus code move one place to the left, with the leftmost digit becoming the rightmost digit. R2 means two left-rotate operations. After the rotations one or more of the dimensions are flipped (all 1s become 0s and all 0s become 1s). For example, D3D4 means flip D3 and D4, after rotation.