Figure 6.

Single-neuron category selectivity is enhanced for the preferred category of the corresponding low-beta ensemble. (A) The z-score statistic for category selectivity of single-neuron FR was evaluated for Cat versus Dog and Goc versus Tad. As in Roy et al. (2010), neurons responded to Cat/Dog and Goc/Tad; these responses were similar and were pooled together for subsequent analysis. (B,C) We identified ensembles of electrodes preferring either Cat/Dog or Goc/Tad category schemes (see text). We plotted the category selectivity of neurons within these ensembles in response to the ensemble's preferred (blue) and nonpreferred (green) category schemes. We found that the neural response was significantly stronger for the ensemble's preferred category scheme than for the nonpreferred scheme. This was true for ensembles identified in both the sample (B) and delay (C) stages. Significance was tested by Wilcoxon signed-rank test with a Holm–Bonferroni correction for multiple comparisons. *P < 0.05; **P < 0.01.