FIG. 5.
Exploring the effects of stimulation on the syllable-sequencing model. Percentage of simulations showing HVCRA distortion (distort), truncation, and song stop (truncate and stop), or syllable transition (transition). A, left: effects of stimulating either a single HVC neuron or 10% of the total HVC population with either 5- or 20-ms current pulses. Right: schematic of the 2 spatial patterns of HVC stimulation. Arrowheads represent excitation and dots represent inhibition. B: effects of stimulating in the neural feedback pathway of the model with Uva → HVCI connections intact. Left: effects of stimulating dRADM/PAm, DM/PAm, or Uva neurons: either a single subpopulation (stimulate 1 subpop) or the total population (stimulate all subpops), and either 5- or 20-ms current pulses. We grouped the data for stimulation of dRADM/PAm, DM/PAm, and Uva. Right: schematic of the 2 spatial patterns of feedback-pathway stimulation. C: different effects of stimulating in the feedback pathway of models with or without Uva → HVCI connections. Left: percentage of simulations showing distortion, truncation, and song stop, syllable transition, or no effect. Right: schematic of the model with and without Uva → HVCI connections. The white rectangles and black circles represent the HVCRA and HVCI populations, respectively.