One important aspect in adult human perceptual learning is studying the generalization of learning to untrained conditions (e.g. untrained stimuli, untrained paired organ etc.). The limits of generalization have been used as a behavioral tool assumed to reflect the level at which the neural changes underlying the learning process occur. Studies in the visual and motor modalities have reported inconclusive findings regarding generalization of learning to the untrained paired organ. In the auditory modality, there are only limited reports on the generalization of learning a non-verbal auditory task to the untrained ear. The aim of the present study was to investigate whether improved performance following training on a verbal auditory task generalizes to the untrained ear. A total of 45 right-handed, normal-hearing young adults, participated in a single-session intensive training experiment. Subjects were trained monaurally to identify the consonant-vowel stimuli /da/-/ga/ embedded in increasing levels of white noise. A group of 23 subjects were trained on the left ear and a second group of 22 additional subjects were trained on the right ear. Twenty-four hours post-training, gains in performance were first assessed in the trained ear. Generalization of learning to the untrained ear was assessed at the same speech-to-noise ratio as for the trained ear. Subjects were exposed to the stimuli in the untrained ear only at the 24 hours post-training session. Results show that following training, both groups showed similar significant delayed gains in performance for the trained ear. Improvement, however, did not generalize to the untrained ear similarly in both groups. Specifically, subjects trained in the right ear demonstrated generalization of learning to the untrained left ear, while those trained on the left ear showed generalization to the right untrained ear but to a lesser extent. To our knowledge, these findings provide first evidence suggesting an asymmetrical generalization of auditory learning of verbal stimuli to the untrained ear following single-session training. These findings may contribute to further understanding of auditory learning and brain lateralization as well as to the design of effective training protocols for enhanced auditory perception.