Scientific Passage...Tricky Question on Structure of Passage

[V vinaym89]

An event-related potential (ERP) is the term
neuroscientists use to describe any brain response to a
thought or perception that can be measured by
electroencephalography (EEG), a technique that can
(5) reliably distinguish between electrical activity in the
brain triggered by physical stimuli and that triggered
by memories, expectations, or other changes in mental
state. One of the most forensically significant ERPs to
be identified, in this case in the 1960s in California,
(10) is P300—so named because its positive voltage
deflection, generally in or near the parietal lobe,
typically peaks 300 milliseconds after the stimulus
appears—which has been linked to high-level cognitive
functions such as evaluation and categorization of
(15) task-relevant stimuli.
That P300 measurements can identify stimuli of
particular significance makes the ERP ideal for
investigative uses. Unlike the polygraph test, which
relies on emotional response and its attendant
(20) physiological effects—increases in heart rate and
blood pressure—to determine whether or not a subject
is telling the truth, brain fingerprinting, the forensic
application of P300 developed by Dr. Lawrence Farwell,
measures only the brain’s response to a given image or
(25) phrase, effectively overriding verbal responses in
which, for example, one might deny familiarity with a
weapon involved in a crime. Though the technique has
demonstrated impressive accuracy, it is limited in that
it cannot account for why the brain reacts to certain
(30) stimuli, only for whether or not information related to
it is present therein. Brain fingerprinting is
admissible in several courts in the United States.

Q. Which of the following best describes the structure of the passage?

A. The scientific background of a forensic technique, followed by perspectives on that technique.
B. Details on a controversial technology and the science on which it is based.
C. Information about neuroscience, then a complication that has arisen from one facet of it.
D. An assessment of two kinds of scientific technique once the technical groundwork for them has been described.
E. An overview of some principles of neuroscience followed by a particular application.

OA :E

Could someone please explain why option A is wrong?

[D damham17]

Could someone please explain why option A is wrong?

A: The scientific background of a forensic technique, followed by perspectives on that technique.

The introduction does not mention ERP specifically as only a forensic technique. The passage starts by explaining what ERP is in a general setting. It is only line 8 that starts to introduce ERP related to forensics. This thought is developed even further when the author compares ERP to a polygraph test in the middle/end of the passage.

[BTG Expert Team]

What we see: a Reading Comprehension structure question. We name the job of each paragraph, in order, and pick the choice that says the same thing. The poster asked why A is wrong; Step 3 answers that.

Step 1. Find the job of paragraph 1.
What we see: definitions. An ERP is any brain response that EEG can measure. P300 is one ERP, named for a positive peak about 300 milliseconds after a stimulus, and it is linked to judging and sorting what we see.
What it means: this is general neuroscience. The phrase "one of the most forensically significant ERPs" hints at where the passage is going, but the paragraph itself explains principles.

Step 2. Find the job of paragraph 2.
What we see: "That P300 measurements can identify stimuli of particular significance makes the ERP ideal for investigative uses." Then it describes brain fingerprinting, the forensic use of P300: how it differs from a polygraph, one limit, and the fact that some courts accept it.
What it means: paragraph 2 takes the science from paragraph 1 and shows one real use of it.
What we do and why: write the summary before reading the choices: neuroscience principles, then one application of them.

Step 3. Why A is wrong.
What we see: A says "the scientific background of a forensic technique, followed by perspectives on that technique."
What it means: "perspectives" means points of view, opinions from people or sides. Paragraph 2 gives no one's opinion: no critics, no supporters, no debate. It describes what the technique does, compares it with the polygraph, states one limit, and states a fact about courts. That is a description of an application, not perspectives on it. A also misreads paragraph 1: it is about ERPs and P300 in general, not background written for one technique, which is not even named until paragraph 2.
What we do and why: one wrong word sinks a structure choice. The passage never gives perspectives, so A is out.

Step 4. Check the other choices.
B: nothing says the technology is controversial, and the order is backward (the science comes first, not second).
C: paragraph 2 is a use, not a complication. The single limit is a small detail.
D: the polygraph is mentioned only as a contrast. The passage does not assess two techniques.
"An overview of some principles of neuroscience followed by a particular application" matches paragraph 1, then paragraph 2.

The trap: A. Its first half fits well, so it is easy to skim past "perspectives." Always test the second half as hard as the first.
Takeaway: On a structure question, test every key word of a choice against the passage. A choice that adds something the passage never does (perspectives, a controversy, a complication) is wrong even when the rest fits.

Answer: E