Behavioral and Brain Sciences

Author's Response
Halford et al.: Relational complexity

Relational complexity metric is effective when assessments are based on actual cognitive processes

Graeme S. Halford a1, William H. Wilson a2 and Steven Phillips a3
a1 Department of Psychology, University of Queensland, Brisbane, Queensland 4072, Australia [email protected]
a2 School of Computer Science and Engineering, University of New South Wales, Sydney, New South Wales, 2052 Australia [email protected]
a3 Cognitive Science Section, Electrotechnical Laboratory, Tsukuba, 305, Japan [email protected] [email protected]/welcome.html


The core issue of our target article concerns how relational complexity should be assessed. We propose that assessments must be based on actual cognitive processes used in performing each step of a task. Complexity comparisons are important for the orderly interpretation of research findings. The links between relational complexity theory and several other formulations, as well as its implications for neural functioning, connectionist models, the roles of knowledge, and individual and developmental differences, are considered.