Fig. 6

Boxplots showing the distributions of absolute weights at 300 Hz and 900 Hz pulse rates. The weights were pooled across all ECoG recordings from all nine rats. The x-axis indicates the individual click in the 4-pulse train, and the y-axis shows the absolute beta value (“temporal weight”) obtained from the Ordinary Least Squares regression. The top panels show all absolute weights (“All β”). The bottom panels show the weights which were significantly different (“Significant β”) from zero (p < 0.05). There is a trend for the median absolute weightings in “Significant β” on the first click to be larger than for the other clicks, but the trend appears to be very modest when compared to the behavioral TWFs seen in Fig. 2, where the weights on the first click were an order of magnitude larger than those seen on the later clicks. The statistical significance of that trend is doubtful and very difficult to assess accurately given the non-normal nature and the nested statistical dependencies of the individual observations