This repository contains the Matlab code to reproduce the simulations described in "Culture without copying or selection". The main script is CAT.m (the script rescale.m is a custom function used by CAT.m). To run the simulation lunch the function CAT from the Matlab command window, with the appropriate parameters, as follows: * alpha: the value used to calculate the reach of convergent transformation * F: if 0 selection is random, if 1 it is biased * k: the maximum "copying error" if the input is not under convergent transformation * graph: if 1 plot at each time step the population, otherwise set to 0 * max_T: number of time steps * move_pop: if 1, the population starts from a corner of the space * N: population size CAT produces four outputs: * barycentre: the population "barycentre" at each time step * spread: the population "spread" at each time step (calculated as the mean of all distances to the barycentre) * mu_a_proportion: proportion of items under convergent transformation at each time step * fidelity: average fidelity These information can be acessed from the Matlab command window typing: help CAT Please refer to the manuscript for further information.