What ability did Joey demonstrate when asked to repeat sounds in isolation?

The ability demonstrated by Joey when asked to repeat sounds in isolation is correct production of sounds. This indicates that he is capable of articulating the specific phonemes accurately when they are presented to him one at a time. Successfully repeating sounds in isolation suggests that his speech production mechanisms, including the coordination of the vocal tract and the neural pathways responsible for speech, are functioning well within that specific context.

Correct production of sounds in isolation is a critical skill in speech assessment because it provides insight into an individual's articulation abilities without the influence of surrounding linguistic context. If Joey can produce these sounds accurately, it might imply that he has a good understanding of how to physically create the sounds of language, even if he might face challenges in more complex speech tasks or connected speech.

In contrast, options referring to difficulty with sound production or patterns of speech errors would indicate that there are challenges present in articulating sounds accurately. Inability to understand spoken language suggests issues with comprehension rather than production. Joey's performance on the task of repeating sounds in isolation points to proficiency in sound articulation rather than any of these difficulties.