Introduction
Absolute Pitch (AP), more commonly known as “Perfect Pitch,” is an individual’s ability to identify or sing pitches without an external reference. Relative Pitch (RP), on the other hand, is an individual’s ability to identify or sing pitches with an external reference. Most working musicians have Relative Pitch. While it’s commonly assumed that AP is an innate gift, most musicians understand this is not entirely true. And as envious of our AP colleagues as many musicians are, it does not make you better or worse at music or one’s creative disposition. It is simply a fascinating tool; it’s extremely helpful in quick musical processing and application, and yet it can be an irritation to many who experience hyperfixation on pitch content. In this article, we delve into the heavily and acutely researched topics surrounding AP. How is it developed? Is it instinctual? Can it be learned? And, why do people with AP lose it later in life?
After meeting many uniquely different people with the condition and developing a sense of relative pitch (RP) myself, I became interested in the factors of absolute pitch (AP). Only about 1 in 10,000 individuals develop AP, yet I’ve encountered numerous individuals who use their unique ability in musical applications throughout my time studying music. My fascination stems from a sense of jealousy, as someone who is still developing their practice of RP. However, this raises important questions: should I be jealous? Is there something potentially detrimental about having this ability? This curiosity leads me to wonder whether I should try to instill this ability in my future children, and if so, how this might impact their musical journey and personal development.
The Physical Development of AP
Both AP and RP are neurological adaptations commonly used by musicians in their everyday lives and expertise, yet AP is a rare condition and can generally only develop between the period of time when an infant’s auditory cortex is developing. While some individuals have reportedly developed AP after this period, the viability of these learning methods remains unproven. Chin (2003) suggests that younger children may be more likely to develop AP because their developmental stage predisposes them to focus on absolute features of melodies, similar to how they process information in other domains like numbers and spatial reasoning.
Furthermore, in a series of three large surveys and three smaller experimental studies, the combined results conclude that individuals who began their musical studies earlier in their childhood are significantly more likely to develop AP, specifically before the age of seven and generally starting as early as three to four years old. Interestingly, they found that musical individuals with Williams Syndrome overwhelmingly developed precise AP, and that they had done so by starting music training as late as seven to eleven years old — much later than any individual without the condition (Chin, 2003). This additional evidence suggests that the development of AP is primarily based upon developmental and cognitive age, rather than chronological age, pinpointing brain structure and development as a key role in the development of AP.
But, cognitive age is only one end of the equation for AP. Research suggests that an infant’s cognitive style, or their preferred way of processing information, thinking, and problem-solving, is extremely important in an individual’s tendency to develop AP. Cognitive style may even serve as a prerequisite in determining whether someone can develop AP or not. Researchers believe individual differences in breadth of attention, focusing on a “field independent or dependent” cognitive style, determine this likelihood. Field independent individuals can be characterized by their ability to focus more narrowly on a piece of information, taking in bits of information one at a time. Field dependent individuals tend to look more at the context of a situation (Chin, 2003). Within these learning styles, it is the hypothesis of many authors that a narrower breadth of attention in learning can ultimately lead to the development of AP, as depicted by the preponderance of the results in individuals who took the Embedded Figures Test (EFT). Individuals with field independence scored significantly higher on the EFT, of which individuals with AP also scored higher than those without AP (Chin, 2003).
In a study conducted by researchers at the University of Wisconsin, Madison, infants as young as 8-months old and adults were tested for their sequence memory, linking tone sequences to absolute and relative pitch ability and inclination. The study found that 8-month-old infants successfully segmented tone sequences based on absolute pitch patterns, even when relative pitch cues were present. However, when the task relied solely on relative pitch cues, infants were not able to distinguish between the tone sequences (Saffran & Griepentrog, 2001). In contrast, adults, especially those without musical training, relied almost solely on relative pitch cues, suggesting a developmental shift from a more AP approach to learning and memorization to a more RP approach as we age.
In the same study, the researchers propose from their findings that, “the perceptual abilities tested here may be more adequately characterized by an unlearning view of absolute pitch” (Saffran & Griepentrog, 2001, p. 83). The “unlearning” hypothesis advocates that a learner’s experiences ultimately determine whether they maintain AP abilities, in lieu of more complex RP abilities. This “unlearning” could be influenced by factors such as exposure to tonal languages or sensory experiences related to blindness or autism, since those conditions allow individuals to focus more intuitively on different aspects of the environment from others. Researchers from the University of California, San Diego, additionally were able to conclude from a study on a speech-related critical period for AP that early exposure to tonal languages during a critical period of language development may further contribute to the development of AP. In this study, the prevalence of AP was significantly higher among the Chinese students compared to the U.S. students for each age group, indicating a developmental boost in relation to AP for infants exposed to tonal languages (Deutsch et al., 2006). These additional findings suggest a similar connection between cognitive age and AP, though a difference in factors that affect the retention of AP — cognitive style versus environmental factors and experience.
The Neurological Development of AP
The development of AP is linked to structural changes in the brain, specifically in the planum temporale (PT), a region in the brain associated with higher-order auditory processing. Studies show that musicians with AP have larger and more asymmetrical PTs compared to those with RP and non-musicians, suggesting that early musical training, an essential factor in developing AP as noted before, might drive these structural changes in the PT, ultimately leading to enhanced pitch processing abilities. In a study conducted by researchers in the Department of Neuropsychology at the University of Zurich in Switzerland, “By systematically varying the lexical and/or prosodic information of speech stimuli,” they found “consistent activation differences in AP musicians compared with RP musicians and nonmusicians” (Oechslin et al., 2010, p. 447). Their findings pinpoint the PT as a computational hub involved in processing various complex sounds, including music and speech. This overlap in hemispheric dominance for both speech and AP suggests a shared neural substrate and a potential link between language acquisition, retention, and the development of AP.
Additional studies on blind musicians have shown that an early onset of musical training is not a prerequisite for AP development in this unique population. This proposes that the absence of visual input might alter the typical developmental trajectory of AP, potentially leading to the development of AP without the early musical training. A case study by Hänggi et al. (2008) examined ES, a professional musician with AP, musical interval-taste synaesthesia, and tone-color synaesthesia. The study found significant structural differences in ES’s brain compared to controls, particularly in auditory, gustatory, and visual areas. While some differences supported the hypothesis of increased gray matter in certain areas, there was also a surprising reduction in gray matter volume in ES’s auditory cortex. This reduction challenges previous assumptions about brain structure in musicians with AP and suggests that ES’s use of tone-color synaesthesia in conjunction with AP may have led to a reorganization of her auditory cortex, rendering some processes unnecessary.
Factors Leading to the Loss of AP
The loss of AP, often occurring later in life, can be deeply unsettling, especially for musicians who rely on it professionally. Despite being perceived as a lifelong skill, AP is not immune to decline, and its deterioration is linked to a combination of neurological, auditory, and psychological factors. Age-related hearing loss (presbycusis) is a significant factor in AP decline. The degeneration of inner ear structures leads to frequency distortion, disrupting the precise pitch perception crucial for AP (Bianco, 2015).
In addition to auditory decline, neurological factors play a significant role in the erosion of AP. The brain regions responsible for auditory processing, the planum temporale (PT), as discussed, often show signs of reduced activity and connectivity as individuals age. Functional magnetic resonance imaging (fMRI) studies of aging musicians reveal significant changes in these areas, impairing the brain’s ability to associate absolute frequencies with corresponding pitches accurately. Memory consolidation and retrieval, critical for maintaining AP, also decline with age, further weakening an individual’s ability to recall precise pitch information. This deterioration is compounded by a reduction in cognitive flexibility, which weakens an individual’s ability to adapt to new auditory inputs or interpret inaccuracies in pitch perception. These neurological changes create challenges for individuals with AP, disrupting the mechanisms that support their unique ability (Deutsch et al., 2006).
The psychological impact of losing AP can be equally profound and depressing, particularly for musicians who consider it an integral part of their identity and creative process. Many describe the experience as frustrating, disorienting, and anxiety-inducing. AP is often seen as a defining feature of a musician’s skill set, and its loss can lead to feelings of diminished confidence and competence. Dr. Bashour, in an email to Mary Bianco on the loss of AP, states, “while I used to be absolutely positive about pitches, etc., now I am never sure any more” (Bianco, 2015, p. 21). For some, this sense of loss is reinforced by the lack of understanding and support from peers who do not share or fully grasp the experience of AP. Stress and negative emotions are known to impact cognitive and sensory functions too, creating an ongoing cycle of frustration. For musicians and researchers alike, the study of AP loss highlights not only the fragility of this extraordinary ability but also the broader and personal relationship between aging, cognition, and sensory perception.
Conclusion
The phenomenon of AP remains a fascinating area of study, particularly regarding its development, retention, and eventual decline. While research in the field has uncovered its early neurological and environmental foundations, significant gaps remain in understanding the factors contributing to its potential loss with age. Bianco’s (2015) intriguing article pinpoints theorized causes of this loss, with talk about presbycusis, cognitive aging, and the structural role of the PT. However, broader studies are needed to confirm and expand these findings.
Future research should focus on how auditory deterioration and neurological changes, particularly in the PT, may contribute to the loss of AP. Additionally, exploring how or whether continued musical engagement throughout one’s life might mitigate these effects could help researchers and neurologists understand more about the auditory cortex and how it interacts with other parts of the body. Studies examining cross-cultural differences, especially among tonal language speakers, may further reveal how language shapes instances of AP. Understanding the psychological impact of AP loss is equally important, as its decline often affects identity and emotional well-being in musicians. Through addressing these gaps, we can deepen our knowledge of AP as a dynamic ability shaped by age, environment, and neurological change, enhancing our understanding between music, cognition, and aging.
References
Bianco, M. L. (2015). Understanding and dealing with the loss of absolute pitch as one ages (Master’s thesis). ProQuest Dissertations & Theses Global.
Chin, C. S. (2003). The development of absolute pitch: A theory concerning the roles of music training at an early developmental age and individual cognitive style. Psychology of Music, 31(2), 155–171.
Deutsch, D., Henthorn, T., Marvin, E., & Xu, H. (2006). Absolute pitch among American and Chinese conservatory students: Prevalence differences, and evidence for a speech-related critical period. The Journal of the Acoustical Society of America, 119(2), 719–722.
Glasser, S. (2021). Perceiving music through the lens of synaesthesia and absolute pitch. Perception, 50(8), 668–690.
Hänggi, J., Beeli, G., Oechslin, M. S., & Jäncke, L. (2008). The multiple synaesthete E.S. – Neuroanatomical basis of interval-taste and tone-colour synaesthesia. NeuroImage, 43(2), 192–203.
Katsuki, M., Higo, Y., Nishizawa, S., Yoshida, M., Kasahara, U., Sakamaki, K., Kashiwagi, K., Kawamura, S., & Koh, A. (2022). Musician developed left putaminal hemorrhage and lost absolute pitch ability: Case report. Acta Neurochirurgica, 164(1), 185–190.
Oechslin, M. S., Meyer, M., & Jäncke, L. (2010). Absolute pitch: Functional evidence of speech-relevant auditory acuity. Cerebral Cortex, 20(2), 447–455.
Saffran, J. R., & Griepentrog, G. J. (2001). Absolute pitch in infant auditory learning: Evidence for developmental reorganization. Developmental Psychology, 37(1), 74–85.