Data and Analysis Unit: CAM2
Last update: 2014-08-28 by Andy Wills
Category learning task, reported in Wills (2002, Experiment 1).
DAU created after publication in response to a raw data request (C. Myers, 2014).
This DAU contains stimulus files, raw data for conditions 2500 ms and 1000 ms,
and an analysis script, in open
cross-platform formats (see the file format notes)
The 130-item test phase was immediately followed by a
24-item single-icon test. These data were not reported in Wills (2002) due to
space limitations, but are included in this DAU.
The APA-format citation for this resource is:
Wills, A.J. (2014). Data and Analysis Unit: CAM2. Retrieved from http://www.willslab.co.uk/cam2
If you make use of these resources, please drop me an email: firstname.lastname@example.org.
- cam1stim.tbz (11 KB) - Stimulus image files (from CAM1; stimuli
1-36 used in the current study).
- cam2data.txt (388 KB) - Trial-level raw data.
Column headings are as follows:
- cond: Experimental condition. 1 = "2500 ms", 2 = "1000 ms"
- subj: Participant number (unique within CAM2)
- key: Key counter-balance condition. 1: "X" - Category A, ">" - Category B. 2: vice versa.
- phase: Experiment phase. 1 = training, 2 = test, 3 = single-icon test.
Where phase = 0, the prototypes of categories A and B are listed, with trial specifying
the category (1 = "A", 2 = "B"). 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"
- Phase 2: Number of category A elements (0-12)
- Phase 3: The category to which the icon is typically assigned in training. 1 = "A", 2 = "B".
- ic1 (through to ic12): The icon(s) making up the presented stimulus. The numbers
correspond to the filenames in cam1stim.tbz (e.g. "1" indicates "1.png"). In phase 3, only one icon
is presented per trial, and this is represented in ic1 (ic2-ic12 are set to zero). In phases 1 and 2,
12 icons are presented. The arrangement of icons ic1-ic12 on the screen in phases 1-2 is as follows:
1 ,2 ,3 ,4
5 ,6 ,7 ,8
- resp: Participant's response. 1 = "A", 2 = "B", 255 = participant timed out,
-1 = "no response required" (training is observational)
- rt: Participant's reaction time (in seconds). -1 = "no response required".
-255 = participant timed out.
- cam2analysis.R (6 KB) - R script replicating Wills (2002), in so far as that
is possible (Wills (2002) has three conditions, only two of which are included in this DAU.)
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 in CAM1. CAM2 is similar, but with addition of time-out procedure
and final single-symbol 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.
- cam2source.tbz (6 KB) - BBC BASIC V source code as text files, for
the 2.5s timeout condition. For Acorn RiscPC 600/700/StrongARM or Acorn A5000. The graphics files are accessed by BASIC V via
a SpriteFile (not included). cam2data.txt was compiled from the "DETAIL" data files created from this program.