tatrāyaṃ nyāyamukhagranthaḥ ---"yat jñānamartharūpādau viśeṣaṇābhidhāyakābhedopacāreṇāvikalpaka tadakṣamakṣaṃ prati vartata iti pratyakṣam"
Here is the passage from the Nyāyamukha: "That cognition which [appears] in connection with the form of objects etc., [and which is] non-determinate through the imposed identity of the qualifying and denotative [elements], [and which] operates in relation to each sense organ—that is perception."