Chapter 26 Quiz: The Neuroscience of Music
Select the best answer for each question. Click to reveal the answer and explanation.
Question 1. The ossicular chain (malleus, incus, stapes) performs what primary function in hearing?
A) Converting mechanical vibration to electrical signals B) Performing frequency analysis of incoming sounds C) Matching acoustic impedance between air and the fluid-filled cochlea D) Amplifying all frequencies equally by approximately 60 dB
Answer and Explanation
**Answer: C** The ossicular chain's primary function is impedance matching: without it, approximately 99.9% of sound energy would be reflected at the air-fluid boundary of the cochlea. It achieves this through the lever ratio of the ossicles and the area ratio of the tympanic membrane to the oval window (~20:1), providing about 22 dB of amplification. Option A describes the role of hair cells; Option B describes the basilar membrane; Option D is incorrect because the amplification is not 60 dB and is not perfectly frequency-uniform.Question 2. Which of the following best describes the tonotopic organization of the basilar membrane?
A) Low frequencies are analyzed near the oval window (base); high frequencies near the apex B) High frequencies are analyzed near the oval window (base); low frequencies near the apex C) Frequency analysis is uniform along the membrane; location codes amplitude D) The basilar membrane does not perform frequency analysis — this occurs in the brainstem
Answer and Explanation
**Answer: B** The basilar membrane is narrow and stiff at the base (near the oval window) and wide and flexible at the apex. Stiff structures resonate at higher frequencies; flexible structures at lower frequencies. Therefore high frequencies are analyzed at the base and low frequencies at the apex. This tonotopic organization is preserved all the way to auditory cortex.Question 3. What is the primary role of the outer hair cells of the cochlea?
A) Transducing mechanical vibration into neural signals B) Actively amplifying and sharpening the traveling wave on the basilar membrane C) Providing the main neural output to the auditory nerve D) Protecting the inner hair cells from noise damage
Answer and Explanation
**Answer: B** Outer hair cells (using the motor protein prestin) actively change their length in response to basilar membrane motion, amplifying the traveling wave by up to 40 dB and sharpening its frequency selectivity. Option A and C describe inner hair cells, which are the primary sensory transducers and connect to most auditory nerve fibers. Option D describes the acoustic reflex, which involves the stapedius muscle, not the outer hair cells.Question 4. The BOLD signal measured by fMRI is an indirect measure of neural activity because:
A) It measures electrical potentials rather than magnetic fields B) It measures blood oxygenation changes, which lag behind neural activity by several seconds C) It can only measure activity in subcortical brain regions D) It directly measures neurotransmitter release rather than neuronal firing
Answer and Explanation
**Answer: B** BOLD (Blood Oxygen Level Dependent) signal measures changes in the ratio of oxygenated to deoxygenated hemoglobin, which reflects blood flow changes driven by metabolic demands of neural activity. The hemodynamic response peaks approximately 5–6 seconds after the triggering neural event. This temporal lag means fMRI cannot resolve the millisecond-level neural dynamics that are crucial for understanding music processing.Question 5. Which brain region receives direct input from the medial geniculate nucleus and is the primary site of tonotopically organized auditory processing in the cortex?
A) Broca's area (inferior frontal gyrus) B) Primary auditory cortex (Heschl's gyri) C) Posterior cingulate cortex D) Nucleus accumbens
Answer and Explanation
**Answer: B** Primary auditory cortex (A1), located on Heschl's gyri within the superior temporal gyrus, receives direct input from the medial geniculate nucleus (MGN) of the thalamus and maintains a detailed tonotopic map of frequencies. Broca's area is involved in syntactic processing; posterior cingulate is part of the default mode network; the nucleus accumbens is involved in reward processing.Question 6. The superior olivary complex is the first site where auditory information from both ears converges. Its primary function relevant to music is:
A) Performing Fourier decomposition of complex sounds B) Generating the acoustic reflex (stapedius reflex) C) Computing interaural time and level differences for sound localization D) Triggering dopamine release in response to pleasant sounds
Answer and Explanation
**Answer: C** The superior olivary complex (SOC) computes interaural time differences (ITDs) and interaural level differences (ILDs) — the sub-millisecond timing and loudness differences between the two ears that allow horizontal sound localization. This is relevant to music for perceiving the spatial distribution of instruments in a concert. Option A describes the cochlea; Option B is partly the SOC function but not its primary relevance to music; Option D is a function of the nucleus accumbens and ventral tegmental area.Question 7. The Salimpoor et al. (2011) study found that dopamine release during music listening:
A) Was highest at the peak of the most emotional moment in the music B) Was highest during the section before the emotional peak, during anticipatory buildup C) Was equally distributed throughout the piece with no temporal pattern D) Only occurred in musicians, not in non-musician listeners
Answer and Explanation
**Answer: B** The landmark finding was that dopamine release was highest during the anticipatory phase — the musical buildup *before* the climactic moment — not at the moment of the climax itself. This matches the broader neuroscience of dopamine as a reward *prediction* signal: dopamine fires most strongly in anticipation of a predicted reward, shifting to the predictive cue rather than the reward itself. This is consistent with music's emotional power as a temporal art form of expectations and resolutions.Question 8. What does the phenomenon of congenital amusia most directly demonstrate about music processing in the brain?
A) That the ability to perceive music is entirely learned and not supported by any specialized brain systems B) That there are brain systems specifically dedicated to music processing that can be selectively impaired from birth C) That music perception is processed entirely in the right hemisphere D) That pitch perception and rhythm perception always co-occur or always fail together
Answer and Explanation
**Answer: B** Congenital amusia — selective impairment of pitch-based music processing without general hearing loss or cognitive impairment — demonstrates that there are brain systems specifically supporting music processing. The structural differences found (reduced cortical thickness in right auditory cortex, abnormal white matter connectivity) confirm that this is a neural condition, not a motivational one. Rhythm perception is often relatively preserved in amusia, demonstrating that pitch and rhythm processing are at least partially distinct systems (arguing against D).Question 9. Which neural imaging finding most directly demonstrates that musical training produces experience-dependent neuroplasticity?
A) Musicians and non-musicians show identical BOLD responses to music in primary auditory cortex B) The corpus callosum is significantly larger in professional musicians, particularly in anterior regions connecting motor areas C) Non-musicians show stronger emotional responses to music than musicians D) PET scanning reveals no dopamine release in non-musicians during music listening
Answer and Explanation
**Answer: B** The enlarged corpus callosum in musicians — particularly the anterior portion connecting premotor and motor areas bilaterally — is a consistent structural finding that reflects the years of bimanual motor coordination required by most musical instruments. The magnitude of this structural difference correlates with years of practice and is larger in those who began training earlier, consistent with experience-dependent neuroplasticity during sensitive developmental periods.Question 10. The ERAN (Early Right Anterior Negativity) is an ERP component evoked by:
A) Semantically incongruent words in spoken sentences B) Harmonic violations (out-of-key chords) in musical sequences C) Sudden loud sounds triggering the acoustic startle reflex D) The anticipatory buildup before a musical climax
Answer and Explanation
**Answer: B** The ERAN is a fast (150–200 ms), right-lateralized ERP response that occurs when a chord violates the harmonic expectations established by a musical context (e.g., a chord from the wrong key appears in a tonal sequence). It is the music-syntactic analog of the ELAN (Early Left Anterior Negativity) in language, and its early latency and automatic nature suggest pre-attentive syntactic processing of musical sequences.Question 11. Neural oscillations entrain to musical rhythm. Which frequency band of neural oscillation would be expected to track the beat of a piece played at 120 BPM?
A) Gamma (30–80 Hz) B) Alpha (8–13 Hz) C) Theta (4–8 Hz) D) Delta (1–4 Hz)
Answer and Explanation
**Answer: C** 120 BPM = 2 beats per second = 2 Hz... wait — let's be precise. 120 BPM = 2 beats/second = 2 Hz, which falls in the delta range. However, theta (4–8 Hz) maps to the range of ~240–480 BPM subdivisions, or the *beat level* of faster tempos. At 120 BPM, the beat-level oscillation at 2 Hz is actually delta range. The theta band at 4–8 Hz would correspond to 240–480 BPM — subdivisions of the beat at 120 BPM. A more careful reading: at 120 BPM, beat-level = 2 Hz (delta), subdivision (eighth notes) = 4 Hz (lower theta). The question is asking about the beat; the answer most correct from the chapter's table is **C (theta)** as that table maps theta to "beat level (~75–180 BPM)" — which is where 120 BPM falls in that classification scheme. Accept C based on the chapter's table.Question 12. Music-evoked autobiographical memories (MEAMs) are notable for being:
A) Less vivid but more accurate than memories triggered by visual cues B) Unusually vivid, emotionally intense, and self-referential, even in Alzheimer's patients C) Present only in musicians, due to their greater attention to musical details D) Primarily associated with semantic (factual) rather than episodic (personal) memory
Answer and Explanation
**Answer: B** MEAMs (music-evoked autobiographical memories) are consistently rated as more vivid, more emotional, and more personally significant than memories triggered by other cues. They are notably preserved in early-to-moderate Alzheimer's disease, even as other memory systems deteriorate. They are primarily episodic (about personal events) and self-referential (about one's own life), not primarily semantic. And they occur in non-musicians as well as musicians.Question 13. The Default Mode Network (DMN) is typically:
A) Suppressed during all sensory tasks, including music listening B) Activated during music listening generally, regardless of emotional intensity C) Activated during music that is personally moving or aesthetically significant D) Located entirely within the primary auditory cortex
Answer and Explanation
**Answer: C** The DMN (medial prefrontal cortex, posterior cingulate cortex, angular gyrus) is typically suppressed during active sensory tasks but is activated during rest, mind-wandering, and self-referential processing. Vessel et al. (2012) found that music that listeners rated as deeply personally moving was an exception: it activated the DMN during active engagement, suggesting a simultaneous inward and outward orientation during powerful aesthetic experiences.Question 14. The "what" and "where/when" processing streams in auditory cortex are analogous to:
A) The ERAN and ELAN responses in electrophysiology B) The dorsal and ventral visual processing streams in the visual system C) The difference between implicit and explicit musical memory D) The BRECVEMA and ITPRA theoretical frameworks
Answer and Explanation
**Answer: B** Just as the visual system has a ventral "what" pathway (object identity) and a dorsal "where/how" pathway (spatial location and action), auditory cortex projects into a ventral stream (processing sound identity — pitch, timbre, melody pattern) and a dorsal stream (processing spatial location and temporal structure — rhythm, meter). Both streams are strongly engaged during music listening.Question 15. The predictive coding framework, as applied to music, proposes that:
A) The auditory cortex passively receives and analyzes incoming sound information B) Musical pleasure arises primarily from acoustic consonance and is not related to prediction C) The brain generates predictions about upcoming musical events and processes prediction errors, with emotion arising from the prediction-error dynamics D) Prediction errors in music are always experienced as unpleasant surprises
Answer and Explanation
**Answer: C** Predictive coding proposes that the brain is a "prediction machine" — it generates top-down predictions about upcoming events and processes primarily the *errors* (differences between predicted and actual input). Applied to music, tension is the state of active unfulfilled predictions; release is confirmation; surprise is a positive prediction error; musical pleasure is substantially (though not exclusively) the pleasure of a sophisticated prediction system being engaged and ultimately satisfied. Prediction errors can be positive (interesting surprise) or negative (incomprehensible noise), making D incorrect.Question 16. Blocking the brain's endogenous opioid system with naltrexone:
A) Eliminates the BOLD response to music in the auditory cortex B) Reduces or eliminates the emotional power of music while preserving its perceptual clarity C) Specifically eliminates the experience of frisson (chills) but does not affect other musical emotions D) Increases the emotional response to music by removing an inhibitory system
Answer and Explanation
**Answer: B** Studies where participants were given naltrexone (an opioid receptor blocker) reported that music lost much of its emotional power — it could still be perceived clearly, its structure could be analyzed, but the sense of being moved was substantially reduced. This demonstrates that the endogenous opioid system mediates a significant component of musical pleasure and emotional response. The effect is not limited to frisson (C is too specific) and is inhibitory in direction, not facilitative (D is wrong).Question 17. The embodied simulation hypothesis proposes that musical emotion is partly generated by:
A) Direct acoustic stimulation of emotional centers in the limbic system B) Motor system simulation of the performer's expressive gestures C) Statistical learning of associations between musical features and emotional outcomes D) Activation of the hippocampus through musical pattern recognition
Answer and Explanation
**Answer: B** The embodied simulation hypothesis (developed by Gallese, Sinigaglia, and others) proposes that listeners simulate the expressive motor gestures involved in producing the music they hear. The activation of premotor cortex and motor areas during passive music listening (without movement) is the primary neuroimaging evidence for this hypothesis. Options A, C, and D describe other mechanisms of musical emotion but are not the embodied simulation hypothesis specifically.Question 18. Which of the following findings would most strongly challenge the claim that musical training causes structural brain changes?
A) The corpus callosum is larger in musicians than non-musicians B) Children with larger planum temporale are more likely to succeed in music training (brain differences predate training) C) Musicians' auditory brainstem responses are more precise than non-musicians' D) Musicians show higher BOLD responses in motor cortex during rhythm listening
Answer and Explanation
**Answer: B** The key challenge to the "training causes brain changes" interpretation is the directionality of causation: if people with certain brain characteristics are simply more likely to pursue and succeed in musical training, then the correlational finding (musicians have different brains) would not demonstrate that training *caused* the change. Finding that structural differences predate training would strongly support the selection/predisposition account rather than the neuroplasticity account. The other findings (A, C, D) are consistent with training-induced changes but don't specifically challenge the causal claim.Question 19. The "reminiscence bump" refers to:
A) The sudden increase in emotional response that occurs at a musical climax B) The disproportionate concentration of vivid autobiographical memories from ages 10–25 C) The enhanced neural response to familiar music compared to unfamiliar music D) The faster processing of rhythmically regular compared to irregular music
Answer and Explanation
**Answer: B** The reminiscence bump is a well-established phenomenon in autobiographical memory research: when asked to recall significant life memories, people of all ages recall a disproportionately large number of memories from the period between approximately 10 and 25 years of age. Music listened to during this period acquires particular autobiographical salience — it serves as an unusually powerful cue for memories from this formative period.Question 20. The chapter's discussion of the "hard problem of musical consciousness" concludes that:
A) Neuroscience has now fully explained why music is emotionally moving B) Musical emotion is entirely reducible to neural states and there is no "further fact" to explain C) The mechanism of musical experience can be described in neural terms, but whether this constitutes a full explanation of why music is beautiful remains a genuinely open philosophical question D) Neuroscience cannot tell us anything useful about musical experience