. Author manuscript; available in PMC: 2018 Jan 1.

Published in final edited form as: J Exp Psychol Hum Percept Perform. 2016 Oct 31;43(1):30–54. doi: 10.1037/xhp0000290

Table A1.

Symbol Meanings

Symbol	Meaning
S	The study angle in degrees.
R	The response angle in degrees.
P^M	Probability that the tested item is in WM.
P^O	Probability that a memory item is continuous in nature. 1 – P^O is the probability that a memory item is categorical in nature.
σ ^O	Continuous WM imprecision in degrees $(1 ∕ \sqrt{p r e c i s i o n})$ . Serves the same function as the WM imprecision parameter in the ZL model.
μ _k	The category center of the kth category.
ψ _k	An indicator of whether or not the kth category is active, i.e. used by the participant. Is equal 1 if the category is active, 0 otherwise.
σ ^S	Category (in)selectivity. Lower values result in more abrupt transitions between categories for the weights function.
σ ^A	Categorical WM imprecision $(1 ∕ \sqrt{p r e c i s i o n})$ : Determines how close a categorical response it to the category center.
P^AG	Probability of a categorical guess (versus a uniform guess).
V(x, μ, σ)	Probability density function of the von Mises distribution for observation x with center μ and precision 1/σ² (i.e., we have parameterized V in terms of, roughly speaking, standard deviation rather than precision).