Final answer:
Spontaneous talks are impromptu, casual, and flexible, while planned discussions are pre-arranged, formal, and structured with a clear agenda.
Step-by-step explanation:
The differences between spontaneous talks and planned discussions lie in the preparation, structure, and formality of the interaction. Spontaneous talks are typically impromptu and occur without prior planning or structure. They are often more casual and can happen in any setting. Conversational dynamics in spontaneous talks can be very fluid, and the topics can change rapidly based on the interests of the participants. In contrast, planned discussions are pre-arranged, have a clear agenda, and are more structured. They often occur in formal settings, such as meetings or debates, where the goal is to discuss specific topics or make decisions. The participants in planned discussions usually prepare in advance, which can make the distribution of speaking time and the direction of the conversation more predictable.