Data and Analysis Unit: CAM1

Last update: 2014-08-26 by Andy Wills

Description

Category learning task, reported in Wills et al. (2000, Experiment 2). DAU created after publication in response to a raw data request (C. Myers, 2014). This DAU contains stimulus files, raw data, and an analysis script, in open cross-platform formats (see the file format notes).

Citation

The APA-format citation for this resource is: Wills, A.J. (2014). Data and Analysis Unit: CAM1. Retrieved from http://www.willslab.co.uk/cam1

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

Resources

cam1stim.tbz (11 KB) - Stimulus image files.
cam1data.txt (439 KB) - Trial-level raw data. Column headings are as follows:
- cond: Experimental condition. 1 = "Three-choice", 2 = "Two-choice", 3 = "Novel-elements"
- subj: Participant number (unique within CAM1)
- fixed: The category for which each training item contains 4 elements (1 = "A", 2 = "B", 3 = "C"). It is also the category response that is disallowed in the "two-choice" condition test phase.
- phase: Experiment phase. 1 = training, 2 = test. Where phase = 0, the prototypes of categories A, B and C are listed, with trial specifying the category (1 = "A", 2 = "B", 3 = "C", 4 = novel icons; novel icons reported in all conditions but only presented to participants in the test phase of the "novel-elements" condition). The other columns are meaningless in phase 0. Phase 0 was not experienced by participants, it represents the computerized generation of the protoypes before the participant enters the room.
- trial: Trial number (resets between phases)
- catordist: Phase-specific.
  - Phase 1: The category from which the training item was generated. 1 = "A", 2 = "B", 3 = "C"
  - Phase 2: Values 10-13 indicate dummy stimuli (see paper). Meaning of values 1-9 depends on 'fixed':
    - fixed = 1 or 2 : Number of category C elements + 1
    - fixed = 3 : Number of category B elements + 1
- ic1 (through to ic12): The 12 icons making up the presented stimulus. The numbers correspond to the filenames in cam1stim.tbz (e.g. "1" indicates "1.png"). The arrangement of icons ic1-ic12 on the screen is as follows:
  1 ,2 ,3 ,4
  5 ,6 ,7 ,8
  9,10,11,12
- resp: Participant's response. 1 = "A", 2 = "B", 3 = "C", -1 = "no response required" (training is observational)
- rt: Participant's reaction time (in seconds). -1 = "no response required".
cam1analysis.R (4 KB) - R script for analyses reported in Wills et al. (2000, Exp 2). This script can be run by the command source('cam1analysis.R'), or can be run interactively.

Further resources

The following resources are not formally part of the archive, either because they do not use open formats, or because they have not been thoroughly bug-checked, or both. They are provided in case others find them useful, with absolutely no warranty!

cam1vid.mp4 (1.4 MB) - Short video showing written instructions and an illustrative few trials of training and test. This video was created using QuickTime Player screen recording of a BBC BASIC V program running under emulation (Virtual A5000) on Windows XP, in turn running on Parallels 9 on a Late 2013 MacPro. The video was subsequently edited using iMovie. It is a reasonably close, but not exact, representation of how the experiment ran on an Acorn RiscPC 600.
cam1source.tbz (11 KB) - BBC BASIC V source code as text files. For Acorn RiscPC 600/700/StrongARM or Acorn A5000. The graphics files are accessed by BASIC V via a SpriteFile (not included). cam1data.txt was compiled from the "Read" data files created from this program.