Fig. 5.

Differential selectivity of ensemble firing patterns for relational and sensory stimulus features. A: decoding analyses were repeated with input vectors containing a varying number of subsampled neurons in each type. Red crosses indicate decoding accuracy in each support vector machine (SVM) run. Resultant decoding accuracy was fitted to a custom function (blue line). Gray dashed line represents 25% chance level. BT, burst-firing neurons; FS, fast-spiking neurons; RF, regular-firing neurons. B: representative confusion matrices from an SVM run with 80 subsampled neurons showing the proportion of trials in each condition (rows) that were classified as 1 of 4 conditioned stimulus (CS) presentation types (columns). Hotter color along diagonal illustrates the high accuracy of decoding. ACSA, auditory CS presented alone; ACS-US, auditory CS paired with unconditioned stimulus (US); VCSA, visual CS presented alone; VCSUS, visual CS paired with US. C: proportion of trials classified as those with incorrect CS-US contingency (left), incorrect CS identity (middle), or both (mixed; right). Each data point represents the proportion of errors in an SVM run with 80 subsampled neurons, and horizontal bars show the median. *P < 0.001, Kruskal–Wallis test, P < 0.05, post hoc Dunn’s test.