afferent vs perceptible

afferent

adj

  • Carrying towards. 

noun

  • An afferent structure or connection 

perceptible

adj

  • Able to be perceived, sensed, or discerned. 

noun

  • Anything that can be perceived. 

How often have the words afferent and perceptible occurred in a corpus of books? (source: Google Ngram Viewer )