Unit 2: Causes, Prevention and Effects of Deafness- Questions

Fill in the blanks:

1. More than 50% of congenital hearing loss is ________.
2. Enrolling a child in Auditory-Verbal Therapy (AVT) is an example of ________ prevention.
3. Hearing children acquire up to 80% of their knowledge ________ by overhearing background conversations.
4. Vowels are low-frequency and ________-intensity sounds.
5. The global gold standard for early identification of hearing loss is the ________ rule.
6. The beginning of stringing together consonant-vowel sounds like “ba” or “pa” is called ________ babbling.
7. A severe lack of oxygen to the baby’s brain during delivery is known as ________.
8. Reading is based on ________, which maps a visual letter to a spoken sound.
9. Sensorineural hearing loss causes a loss of volume as well as ________ of sound.
10. The destruction of unused auditory neural connections by the brain is known as synaptic ________.

Answers:

1. Genetic
2. Tertiary
3. Incidentally
4. High
5. 1-3-6
6. Early
7. Asphyxia/Hypoxia
8. Phonics
9. Distortion
10. Pruning

Tick the correct option:

1. Which of the following is a clinical red flag for hearing impairment at 9 months?

A) Does not exhibit a startle reflex

B) Does not respond to their own name

C) Does not combine two words

D) Does not point to body parts

2. The ability to understand that other people have different thoughts and feelings is known as:

A) Incidental learning

B) Theory of Mind

C) Executive Functioning

D) Prosody

3. Which of the following is an ototoxic medication that can damage the hair cells in the cochlea?

A) Aminoglycoside antibiotics

B) Folic acid

C) Acetaminophen

D) Penicillin

4. Providing genetic counseling to couples with a family history of deafness is an example of:

A) Primary prevention

B) Secondary prevention

C) Tertiary prevention

D) Quaternary prevention

5. In human speech, consonants are primarily responsible for carrying the:

A) Volume

B) Rhythm

C) Meaning and clarity

D) Pitch

6. According to the critical period hypothesis, the window for native language acquisition effectively shuts by:

A) 1 year of age

B) 3 years of age

C) 5 years of age

D) Puberty (around age 12)

7. Direct localization, where a child turns their head accurately toward a sound source, typically develops at:

A) 0 to 3 months

B) 4 to 6 months

C) 7 to 9 months

D) 13 to 18 months

8. When adults hold jobs below their actual intellectual capacity due to communication barriers, it is called:

A) Occupational limitation

B) Underemployment

C) Workplace fatigue

D) Income gap

9. A high-frequency sloping hearing loss typically destroys the perception of:

A) Vowels

B) Environmental hums

C) Consonants like /s/ and /f/

D) Low-pitched sounds

10. In the TORCH complex of maternal infections, the ‘R’ stands for:

A) Rhinovirus

B) Rubella

C) Rabies

D) Respiratory Syncytial Virus

Answers:

1. B
2. B
3. A
4. A
5. C
6. D
7. C
8. B
9. C
10. B

True or False

1. Making a sound louder always makes it clearer for a person with Sensorineural Hearing Loss.
2. A severe delay in language acquisition directly indicates a low intellectual capacity.
3. The critical period for language acquisition applies to both spoken language and sign language.
4. Waking up from sleep to loud sounds is an auditory milestone expected between 13 to 18 months.
5. Inserting tympanostomy tubes to drain fluid from the middle ear is a form of secondary prevention.
6. Conductive hearing loss acts like a volume control being turned down without distorting the sound.
7. Severe neonatal jaundice can permanently damage the auditory nerve.
8. Students with hearing loss typically excel at mathematical word problems because math is highly visual.
9. Combining two words together like “More milk” typically occurs between 19 and 24 months.
10. Noise-Induced Hearing Loss (NIHL) primarily damages the ossicles in the middle ear.

Answers:

1. False
2. False
3. True
4. False
5. True
6. True
7. True
8. False
9. True
10. False

Very Short Answer Type Questions:

1. What does the “1” in the 1-3-6 rule stand for?
2. Name one viral infection included in the TORCH complex.
3. Define “Canonical Babbling.”
4. What specific acoustic feature do vowels carry in human speech?
5. What is the ultimate goal of tertiary prevention in hearing loss?
6. Define “Acoustic Smearing” in a classroom context.
7. What is “Presbycusis”?
8. Name the legal act in India that defines hearing impairment thresholds.
9. What is “Incidental Learning”?
10. Which type of hearing loss distorts sound even when it is amplified?

Answers:

1. All infants should undergo a hearing screening by 1 month of age.
2. Rubella (or Cytomegalovirus, Herpes Simplex).
3. Repetitive and complex stringing together of consonant-vowel sounds (e.g., “ba-ba-ba”).
4. Volume and rhythm (the “power” of speech).
5. To stop a permanent hearing loss from becoming a societal or educational handicap through rehabilitation.
6. The overlapping of loud vowel echoes with quiet consonants due to hard walls and floors, reducing speech clarity.
7. Age-related hearing loss resulting from the natural degeneration of the inner ear.
8. The Rights of Persons with Disabilities (RPwD) Act, 2016.
9. Acquiring knowledge passively by overhearing background conversations and surrounding environmental sounds.
10. Sensorineural Hearing Loss (SNHL).

Short Answer Type Questions:

1. Explain the difference between primary and secondary prevention of hearing loss.
2. How does an untreated middle ear infection (Chronic Otitis Media) lead to permanent hearing loss?
3. Describe the impact of hearing loss on a child’s semantic (vocabulary) development.
4. Why do consonants disappear before vowels in most cases of hearing loss?
5. Explain the concept of “Synaptic Pruning” as it relates to auditory deprivation.
6. Briefly describe the “Reflexive Stage” of auditory behavior (0-3 months).
7. What are the psychosocial effects of hearing loss on an adolescent in a mainstream school?
8. Why is reading considered the most significant academic hurdle for a student with severe hearing loss?
9. Describe two clinical “Red Flags” that warrant an immediate audiological referral in a toddler.
10. How does a high-frequency sloping hearing loss affect speech perception?

Answers:

1. Primary prevention aims to stop the impairment before it occurs entirely (e.g., immunizations, noise control). Secondary prevention identifies the hearing loss early and provides immediate medical treatment to halt its progression into a permanent disability (e.g., newborn screening, treating ear infections).
2. Untreated middle ear infections cause fluid buildup behind the eardrum, leading to conductive hearing loss. If ignored long-term, this chronic fluid and inflammation can permanently damage the ossicles (the small middle ear bones).
3. A child with hearing loss acquires vocabulary much slower than hearing peers. They easily learn concrete words (like “cat”) but severely struggle with abstract concepts (like “think”) and words with multiple meanings (like “bank”).
4. Consonants are high-frequency and low-intensity (very soft) sounds. Because they carry such little acoustic power compared to loud, low-frequency vowels, they are the first sounds lost when the auditory system is damaged.
5. Synaptic pruning is the brain’s “use it or lose it” efficiency process. If the auditory cortex does not receive sound stimulation due to hearing loss, the brain assumes those neural pathways are unnecessary and destroys them to make room for other senses.
6. During the Reflexive Stage, auditory responses are mostly involuntary brainstem reflexes. The baby exhibits the Startle Reflex to loud noises, wakes up to loud sounds, soothes to familiar voices, and makes pleasure sounds like cooing.
7. Adolescents relying on lip-reading often experience social isolation because following rapid, multi-person conversations is exhausting. This leads to withdrawal, loneliness, identity confusion, and lower self-esteem due to feeling different from peers.
8. Reading relies on phonics, which requires mapping a visual letter to a spoken sound. If a child cannot accurately hear the sounds of their language, decoding written words becomes incredibly difficult, severely delaying literacy.
9. Clinical red flags include a child not responding to their own name by 9 months, or a complete lack of meaningful single words by 18 months. Any regression or loss of previously acquired speech skills is also a major red flag.
10. A high-frequency sloping loss allows the person to hear low-frequency vowels perfectly, but wipes out high-frequency consonants (/s/, /f/, /th/). Consequently, the person hears the volume of the speech but loses all meaning and clarity, making it sound like mumbling.

Long Answer Type Questions:

1. Discuss the prenatal, perinatal, and postnatal causes of hearing loss in detail.
2. Analyze the cascading effects of hearing impairment on a child’s cognitive, social, and emotional development.
3. Elaborate on the four hierarchical levels of speech perception and explain the “Power vs. Clarity” dilemma in the acoustics of speech.
4. Explain the Critical Period Hypothesis and the neurological consequences (such as Language Deprivation Syndrome) if a child is identified late.
5. Trace the developmental milestones of auditory and speech behavior from birth to 24 months.
6. Describe the three levels of hearing loss prevention (Primary, Secondary, Tertiary) with relevant clinical and educational examples for each.
7. Discuss the specific challenges students with hearing impairment face in the academic environment and the pedagogical implications for a special educator drafting an IEP.
8. Compare and contrast the physiological and perceptual differences between Conductive Hearing Loss (CHL) and Sensorineural Hearing Loss (SNHL).
9. Examine the long-term impact of hearing impairment on employment and vocational outcomes for adults.
10. Discuss the clinical importance of the 1-3-6 rule and how early identification alters the physical trajectory of a child’s neuroplasticity and language competency.

Answers:

1. Causes of Hearing loss: Prenatal causes occur in the womb and include genetics (accounting for over 50% of congenital cases), maternal TORCH infections (Toxoplasmosis, Rubella, CMV), Rh incompatibility, and ototoxic maternal medications. Perinatal causes happen during delivery, such as asphyxia (oxygen deprivation), prematurity, severe neonatal jaundice, or physical birth trauma to the head. Postnatal causes damage a previously normal system after birth and include infections like bacterial meningitis or chronic otitis media, exposure to ototoxic drugs (like Gentamicin), physical head trauma, and Noise-Induced Hearing Loss from prolonged loud exposures.
2. Effects on Development: Cognitively, children lose up to 80% of incidental learning, stunting general knowledge and abstract reasoning due to delayed language. Executive functioning suffers due to the cognitive overload of constant lip-reading. Socially and emotionally, they face delays in Theory of Mind, leading to misunderstandings. Communication barriers cause severe social isolation in mainstream settings and can manifest as behavioral tantrums in early childhood out of frustration, eventually leading to low self-esteem in adolescence.
3. Speech Perception and Acoustics: Speech perception involves four levels: Detection (awareness of sound), Discrimination (differentiating two sounds), Identification (labeling the sound), and Comprehension (understanding meaning). The acoustic dilemma involves vowels vs. consonants. Vowels are low-frequency and loud, carrying the “power” and volume of speech. Consonants are high-frequency and soft, carrying the “clarity” and meaning. Hearing loss typically destroys soft consonants first, meaning the individual can hear the loud vowels (power) but cannot decipher the missing consonants (clarity).
4. Critical Period and Deprivation: The Critical Period Hypothesis states that the brain is exceptionally primed to acquire language (spoken or signed) from birth to 3 years. Due to neuroplasticity, if the brain lacks auditory input, it permanently prunes those unused pathways. Missing this window results in Language Deprivation Syndrome. The consequences are permanent stunting of phonological, syntactic, and semantic abilities, severe cognitive delays since language structures thought, and massive academic failure because the child lacks a first language foundation required for reading and learning.
5. Milestones (0-24 Months): * 0-3 Months (Reflexive): Startle reflex, soothing to mother’s voice, cooing.
   • 4-6 Months (Orienting): Horizontal localization, early consonant-vowel babbling.
   • 7-9 Months (Babbling/Recognition): Direct localization, recognizes name, canonical reduplicated babbling.
   • 10-12 Months (First Words): Follows 1-step commands, speaks 1 or 2 true words with intent.
   • 13-18 Months (Vocabulary Spurt): Points to body parts, rapid growth of expressive vocabulary (up to 50 words).
   • 19-24 Months (Sentence Stage): Follows 2-step commands, combines two words into phrases (e.g., “more milk”).
6. Levels of Prevention: Primary prevention stops the impairment before it happens. Examples include MMR immunizations, genetic counseling, and workplace noise control laws. Secondary prevention catches the loss early to halt progression into disability. Examples include Universal Newborn Hearing Screening (UNHS) and immediate antibiotics or tympanostomy tubes for otitis media. Tertiary prevention manages permanent loss to prevent societal handicap. Examples include fitting hearing aids/cochlear implants, enrolling in Auditory-Verbal Therapy, and using classroom FM systems.
7. Academic Challenges and Pedagogy: Academically, students face massive hurdles in literacy due to the inability to map sounds to letters (phonics). They struggle with math word problems due to complex syntax, and face acoustic smearing in echoey classrooms that obscures the teacher’s voice. For a special educator, the implication is that an IEP must be holistic. It cannot just rely on speech therapy; it must include explicit vocabulary instruction, visual schedules, FM systems to overcome classroom noise, and social-emotional advocacy training.
8. CHL vs SNHL: Conductive Hearing Loss (CHL) is structural, affecting the outer or middle ear. It acts like a turned-down volume control; it weakens sound but does not distort it. If the volume is increased (via hearing aids or loud speaking), speech perception is excellent. Sensorineural Hearing Loss (SNHL) involves nerve or hair cell damage in the inner ear. It causes permanent distortion. Making the sound louder does not make it clearer; a person will still fail to discriminate between similar words, making perception highly degraded despite amplification.
9. Employment Outcomes: Hearing impairment causes significant occupational limitations. Adults are often underemployed, working jobs below their intellectual capacity due to employer prejudice or communication barriers. They face limitations in jobs requiring clear auditory processing or warning signals. An income gap exists due to missed promotions. Furthermore, the intense concentration required to follow office chatter and meetings leads to severe workplace listening fatigue, impacting overall economic independence.
10. The 1-3-6 Rule and Neuroplasticity: The 1-3-6 rule mandates screening by 1 month, diagnosis by 3 months, and intervention by 6 months. This timeline is clinically vital because of neuroplasticity. The infant brain rapidly builds synaptic connections based on sensory input. If identified and aided before 6 months, the auditory cortex receives the necessary stimulation to hardwire language pathways, allowing the child’s trajectory to match hearing peers. Late identification allows the brain to prune those auditory pathways and assign them to visual senses, making future language acquisition neurologically impossible to master fully.