In finger print reader (FINDER), prints of eight fingers are recorded excluding:
First, I remember that standard fingerprinting usually involves the loops from the fingers. Typically, the ten fingerprints include both thumbs and the four fingers on each hand. However, some systems might take a subset. If they're excluding two fingers, which ones are those? Commonly, the thumbs are the most important for identification, so maybe the system uses all fingers except the thumbs? Wait, but the question says eight fingers are recorded, so two are excluded. If the answer excludes the thumbs, that would be two fingers, making the total eight. Alternatively, maybe the little fingers? But I think the standard in some systems is to exclude the thumbs to save space or for a specific purpose.
Wait, in some biometric systems, especially older ones, they might take the four fingers of each hand (index, middle, ring, little), excluding the thumbs. That would be eight fingers. So the correct answer would be excluding the thumbs. Let me verify. The standard ten-print includes all ten fingers, but in some cases, like a partial print, they might take eight. If the question is about a system that uses eight, they might exclude the thumbs. So the correct answer would be the thumbs (fingers A and B if options are labeled accordingly). Therefore, the excluded fingers are the thumbs. The options probably have the thumbs as options A and B. So the answer is excluding the thumbs.
**Core Concept**
Fingerprint identification systems typically record patterns from all ten fingers. However, some specialized devices, like the FINGERPRINT IDENTIFICATION (FINDER) system, may exclude certain digits to optimize data storage or focus on unique ridge patterns. The exclusion is often based on clinical or forensic relevance, such as prioritizing fingers with higher discriminatory value (e.g., thumbs).
**Why the Correct Answer is Right**
The correct answer is **excluding the thumbs**. Thumbs have a higher frequency of loop patterns (radial/ulnar) compared to other fingers, which are more commonly used in forensic identification. By excluding thumbs, the system reduces redundancy while retaining sufficient discriminatory power from the remaining eight fingers (index, middle, ring, and little fingers on both hands). This practice aligns with principles of biometric efficiency and pattern variability.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect—Excluding index fingers would compromise identification accuracy, as they have highly variable patterns.
**Option B:** Incorrect—Excluding middle fingers is illogical, as they are critical for pattern diversity in biometric systems.
**Option C:** Incorrect—Excluding ring fingers is uncommon, as they contribute unique patterns comparable to other digits.
**Clinical Pearl / High-Yield Fact**
Remember that **thumbs are most commonly excluded** in 8-finger systems due to their high loop prevalence. Always associate "thumb exclusion" with "8-finger systems" in exams. This is a classic trap in forensic medicine and biometrics questions.
**Correct Answer: A. Thumb**