Fig. 5From: Altered social behavior and ultrasonic communication in the dystrophin-deficient mdx mouse model of Duchenne muscular dystrophyIsolation-induced ultrasonic vocalizations in pups. a Call rate recorded in the same groups of WT (white circles) and mdx (black circles) pups during postnatal days (PNDs) 3 to 9. Note that both genotypes emitted the highest amount of calls at PND7. b, c Call peak frequency (Pfreq) measured at call start (b) and end (c) points. Note the enhanced peak frequency at call start point in mdx pups at PND3. d–h Postnatal variations in the vocal repertoire showing transient genotype differences at specific PNDs for the percent of simple (d), downward (e), peak (f), sinusoidal (g), and composite calls (h). *p < 0.05Back to article page