Estimation

Maintaining strong flavor of Aristotelian theory of perception, Farabi as well as Avicenna have appended new phases to the theory. Depicting imaginary perception with its crucial jobs, Farabi explains these three activities: storing sensory forms, composing and decomposing sensory forms, as well as imagery. What Farabi names the imaginary faculties, is conceptualized as three inner perceptions, i.e., imagination, estimative and memory faculties in Avicenna’s works. Evolving existing theories of perception, Avicenna delivers an account of five inner perceptions. Beforehand Farabi did not consider any difference between imaginary perception and motekhayelah. However, he mentioned one faculty doing both activities and was usually calling it motekhayelah and sometimes imaginary perception. Conceptualizing imaginary perception with its functions, Farabi deals with three primary activities: storing sensory forms, composing and decomposing sensory forms, and imagery. In other words, Avicenna defines what Farabi calls the imaginary faculties as three inner perceptions, i.e., imagination, estimative and memory faculties.