Create randomized training blocks for CIRP
nosof88, in a
format suitable for the
slpALCOVE model, and any other
model that uses the same input representation format. The stimulus
co-ordinates come from a MDS solution reported by Nosofsky (1987) for
the same stimuli.
nosof88train(condition = 'B', blocks = 3, absval = -1, subjs = 1, seed = 4182, missing = 'geo')
Experimental condition 'B', 'E2', or 'E7', as defined by Nosofsky (1988).
Number of blocks to generate. Omit this argument to get the same number of blocks as the published study (3).
Teaching value to be used where category is absent.
Number of simulated subjects to be run.
Sets the random seed
If set to 'geo', output missing dimension flags (see below)
A matrix is produced, with one row for each trial, and with the following columns:
ctrl - Set to 1 (reset model) for trial 1, set to zero (normal
trial) for all other trials.
cond - 1 = condition B, 2 = condition E2, 3 = condition E7
blk - training block
stim - stimulus number (as defined by Nosofsky, 1988)
x1, x2 - input representation. These are the co-ordinates of an
MDS solution for these stimuli (see Nosofsky, 1987).
t1, t2 - teaching signal (1 = category present, absval = category
m1, m2 - Missing dimension flags (always set to zero in this
experiment, indicating all input dimensions are present on all
trials). Only produced if
missing = 'geo'.
Although the trial ordering is random, a random seed is used, so multiple calls of this function with the same parameters should produce the same output. This is usually desirable for reproducibility and stability of non-linear optimization. To get a different order, use the seed argument to set a different seed.
This implementation assumes a block length of 64 trials for conditions E2 and E7, rather than the 63 trials reported by Nosofsky (1988).
This routine was originally developed to support simulations reported in Wills & O'Connell (n.d.).
R by C matrix, where each row is one trial, and the columns contain model input.
Andy Wills & Garret O'Connell
Nosofsky, R.M. (1987). Attention and learning processes in the identification and categorization of integral stimuli, Journal of Experimental Psychology: Learning, Memory and Cognition, 13, 87-108.
Nosofsky, R.M. (1988). Similarity, frequency, and category representations, Journal of Experimental Psychology: Learning, Memory and Cognition, 14, 54-65.
Wills, A.J. & O'Connell (n.d.). Averaging abstractions. Manuscript in preparation.
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