"peripheral subject" is correct and very commonly used in written English.
You can use it to refer to a subject or topic that is not as relevant or important as the main focus of a conversation or discussion. For example, "After discussing the main points, we spent some time discussing the more peripheral subject of local politics."
This lack is amplified by a surfeit of information about peripheral subjects and individuals; this is a book in which, metaphorically speaking, the footnotes have footnotes.
It has huge consequences for Britain and for Europe, but the debate is being fought on peripheral subjects that have been made to seem central – quotas and the length of the working week, things that can be negotiated.
Accumulating lots of passes in easy and peripheral subjects is not the same as gaining a handful of stellar grades in hard ones.
Assigning the type wh/(np\s) to 'what', we can derive wh for the first example, with a np hypothesis in the left-peripheral subject position.
An elegant study by Cheong et al [37] examined 'traffic gap' judgement and eye movements in subjects with peripheral visual field loss, including three subjects with glaucoma, as compared to healthy subjects.
To examine the role of visual feedback in the reduction of plantar pressures through teaching a "new" gait pattern to diabetic peripheral neuropathy subjects.
But whether they are aesthetically significant is disputed, and some philosophers go so far as to dismiss all questions of ontology and identity of art as peripheral to the subject matter of aesthetics.
The most frequent types (incidence ≥2.0%) were somnolence, in 65 subjects (12.7%); peripheral edema, in 36 subjects (7.0%); nausea, in 34 subjects (6.7%); dizziness, in 17 subjects (3.3%); hallucination, in 14 subjects (2.7%); fatigue, in 13 subjects (2.5%); and vomiting, in 10 subjects (2.0%).
**PBHS = Peripheral blood healthy subject.
