Neural Population Dynamics during Reaching Are Better Explained by a Dynamical System than Representational Tuning
Fig 2
Comparing rotational structure between the representational and the dynamical models.
(a) One of the two oscillatory modes (2.8 Hz) used to generate the simulated muscle activity of all conditions (2.8 Hz and 0.3 Hz). (b) Firing rate of an example neuron of the dynamical model for all 13 conditions. Each neuron is generated from a random combination of the two underlying oscillatory modes and offset for each condition. (c) Rotational dynamics in the first jPCA plane for the observed data. p-value shows results of CMPT for the representational and dynamical models evaluated by the rotational goodness-of-fit ratio (RGR: ). (d) Same as c, but for permuted data without covariance matching. (e) Same as c, but for covariance-matched data. Data is plotted for 200 ms regardless of time period used to generate statistics. Colors are based on the preparatory activity in the first jPC.