⇄ receptive skills vs. active skills

One can talk about active language skills (talking, writing) and receptive skills (reading, listening); the receptive ones—which even monolinguals may have surprisingly a lot of in other languages—are generally easier to acquire and use.

— 📖 Babel No More (this quote also seems to share that core paradigm of ⌬ sbll)

• the source above is talking about ◊ language learning, but I'm pretty sure you can apply this further — see, for example, perceptual learning/Picture Superiority Effect (=using the ease of learning in a purely perceiving way)

• this may also be what's mirrored in active recall vs. passive recognition

• ↓ ~ receptive skills are easier to learn than active skills