'Vocal mimicry hypothesis' falsified? [Part 2]

Figure (a) Ai tapped C4, (b) Ai tapped C5, (c) Time sequence of a test trial.

A few entries ago I uploaded a fragment from a study (Hattori et al., 2013) that discusses an intriguing experiment with three chimpanzees (Pan troglodytes) which were trained to tap regularly on a piano keyboard.

While the video below is convincing, the study reports that only one of the three chimps participating in the experiment was able to do the task: a chimp named Ai (See video).  Furthermore, Ai was only able to synchronize with stimuli at a rate of 600 ms (and not at rates of 400 or 500 ms). In addition, Ai did this in reaction (positive asynchrony) and not in anticipation of the beat (negative asynchrony).

This is similar to what has been found in studies with macaques (Zarco et al., 2009; Konoike et al., 2012) that also seem to opt for a strategy of to react instead of anticipating to a regular beat. All this in contrast with humans that can intentionally synchronize their tapping to various rates (ranging roughly from 200 ms to 1800 ms) of a varying rhythmic stimulus (and not simply a metronome) while showing a negative synchronization error, i.e. in anticipation of the beat.

Another point of a more methodological nature is that the experimentators used, next to sound, what they called 'light navigation' (see diagram above), a visual cue for the chimps to 'remind them' of which key to press. While the authors write "it was unlikely that the visual stimuli affected tapping rhythm by chimpanzees" we can not be sure this is evidence for rhythmic entrainment in the auditory domain.

Nevertheless, with behavioral methods that rely on overt motoric responses it is difficult to separate between the contribution of perception and action (beat perception vs beat production). This makes electrophysiological measures (such as event-related potentials) a more direct and hence attractive alternative. The latter method has been shown a worthwhile, non-invasive alternative in studying cognitive and neural processing in primates (see, e.g., Ueno et al., 2009) and it was used recently in a study probing beat perception in macaques (Honing, Merchant et al., 2012).*

And lastly, these and earlier observations have lead to the auditory timing dissociation hypothesis (Honing, Merchant et al., 2012). This hypothesis accommodates the fact that nonhuman primates performance is comparable to humans in single interval tasks (such as interval reproduction, categorization and interception), but differs substantively in multiple interval tasks (such as rhythmic entrainment, synchronization and continuation).

* N.B. We are eager to collaborate with a primate lab that is willing to do such a relatively simple listening experiment using EEG with chimpanzees; Would be great to compare the results we now have for human adults, newborns, and macaques with the perception of Great Apes ! Feel free to email me :-)

Hattori, Y., Tomonaga, M., & Matsuzawa, T. (2013). Spontaneous synchronized tapping to an auditory rhythm in a chimpanzee. Scientific Reports, 3 DOI: 10.1038/srep01566.

Hasegawa, A., Okanoya, K., Hasegawa, T., & Seki, Y. (2011). Rhythmic synchronization tapping to an audio–visual metronome in budgerigars Scientific Reports, 1 DOI: 10.1038/srep00120

Honing, H., Merchant, H., Háden, G., Prado, L., & Bartolo, R. (2012). Rhesus Monkeys (Macaca mulatta) detect rhythmic groups in music, but not the beat. PLoS ONE, 7 (12) DOI: 10.1371/journal.pone.0051369

Thrirty-two metronomes synchronizing?

If you place 32 metronomes on a static object and set them rocking out of phase with one another, they will remain that way indefinitely. Place them on a moveable surface, however, and something very interesting happens (dedicated to Christiaan Huygens):



For more 'variations' see the Ikeguchi Lab, Japan.

Are monkeys capable of rhythmic entrainment?

Hugo Merchant Lab

On Friday 24 May 2013  Hugo Merchant (Institute of Neurobiology, Querétaro, Mexico) will give a CSCA Lecture with the title Neurophysiology of temporal and sequential processing during a synchronization-continuation tapping task. He will present a recent study investigating rhythmic entrainment in Rhesus monkeys (Macaca mulatta).

A recent study has shown that Japanese macaques (Macaca fuscata) are able to spontaneously synchronize their arm movements when they are paired and facing each other, suggesting that monkeys can coordinate their actions in a social setting and establish some level of rhythmic entrainment (Nagasaka et al., 2013; see earlier entry). However, the asynchronies between the pairs of tapping monkeys are positive, largely dependent on the visual input that the other monkey provides, and with little influence on the sounds that the monkeys made when tapping. The question remains of whether more closer human relatives such as the great apes, show a more sophisticated ability for rhythmic entrainment than macaques.

Macaca mulatta

Hugo Merchant will present a recent study in which two monkeys (Macaca mulatta) were trained in a synchronization-continuation tapping paradigm called a synchronization-continuation tapping task (SCT) in which auditory (A) or visual (V) cues were presented to construct the periodic target interval ranging from 0.45 to 1 second. Initially, animals synchronized their arm movements with a sensory cue by tapping on a push-button, followed by self-pacing of the target interval when the metronome was switched-off. In addition, the monkeys performed a single interval reproduction task (SIRT). We recorded the single-cell activity of 1500 neurons from the macaque medial premotor cortex (MPC) during the task performance.

The results suggest that distinct populations of cells in the MPC can encode different temporal and sequential aspects of the SCT and suggest that MPC is part of a core timing network that uses interval tuning as a signal to represent temporal processing in a variety of behavioral contexts where time is explicitly quantified.

Location: room DS.02, REC D, Nieuwe Achtergracht 129 (entrance through REC G, Nieuwe Prinsengracht 130), Amsterdam.

Time: 16:00 - 17:00 hrs, followed by informal drinks. Registration is not necessary.

For more information, see the website of the CSCA.

Nagasaka, Y., Chao, Z., Hasegawa, N., Notoya, T., & Fujii, N. (2013). Spontaneous synchronization of arm motion between Japanese macaques Scientific Reports, 3 DOI: 10.1038/srep01151

Interested in a PhD position at the University of Amsterdam?

The Institute for Logic, Language and Computation (ILLC) currently has two PhD fellowships available at the Faculty of Science starting on 1 September 2013. Applications are invited from excellent candidates wishing to conduct research in an area in which either the Logic and Language group or the Language and Computation group at ILLC are active, such as the computational modeling of human information processing, especially natural language and music (LaCo) and/or foundational issues in mathematics and computer science (LoCo). For more information, see here. Deadline for applications is 12 May 2013.

Wat maakt ons muzikale dieren? [Dutch]

Dit essay beschrijft een recentelijk ingezette zoektocht over de vraag wat ons muzikale dieren maakt. Wat is er te zeggen over de oorsprong van muziek en muzikaliteit vanuit een biologisch en evolutionair perspectief? Hoe is muziek ontstaan? Is muziek uniek voor mensen, zoals taal dat lijkt te zijn? En zo niet, welke muzikale vaardigheden delen we dan met andere primaten? Het antwoord op deze vragen zal nog veel onderzoek vergen.


Deze voorpublicatie, van een boek dat naar verwachting zal verschijnen in de winter van 2014 bij Nieuw Amsterdam, is een verslag van de eerste stappen die onze onderzoeksgroep zet op dit grotendeels onontgonnen onderzoeksterrein.

Honing, H. (2013). Op zoek naar wat ons muzikale dieren maakt. Gratis download via iTunes (iPad only).

Was Steven Pinker right after all? [Part 2]

At the end of the 1990s, cognitive psychologist Steven Pinker infamously characterized music as “auditory cheesecake”: a delightful dessert but, from an evolutionary perspective, no more than a by-product of language. But Pinker was probably right when he wrote: “I suspect music is auditory cheesecake, an exquisite confection crafted to tickle the sensitive spots of...our mental faculties.” Or, to express his idea less graphically: music affects our brains at specific places, thereby stimulating the production of unique substances that have a pleasurable effect on our mood. However, rather than a by-product of evolution, music or more precisely musicality is likely to be a characteristic that survived natural selection in order to stimulate and develop our mental faculties (cf. Honing, 2011).

Pinker’s idea may actually be a very fruitful hypothesis whose significance has wrongfully gone unacknowledged because of all the criticism it elicited. After all, the purely evolutionary explanations for the origins of music largely overlook the experience of music we all share: the pleasure we derive from it, not only from the acrobatics of making it but also from the act of listening to it.

Last week Science published a study (a follow-up of Salimpoor et al., 2011) in which Canadian researchers were able to show precisely that: Music can arouse feelings of euphoria and craving, similar to tangible rewards that involve the striatal dopaminergic system. They were able to show that intense pleasure in response to music can lead to dopamine release in the striatal system, most notably the nucleus accumbens. And, more importantly, the anticipation of an abstract reward can result in dopamine release in an anatomical pathway distinct from that associated with the peak pleasure itself.

Salimpoor, V., van den Bosch, I., Kovacevic, N., McIntosh, A., Dagher, A., & Zatorre, R. (2013). Interactions Between the Nucleus Accumbens and Auditory Cortices Predict Music Reward Value Science, 340 (6129), 216-219 DOI: 10.1126/science.1231059

Salimpoor, V., Benovoy, M., Larcher, K., Dagher, A., & Zatorre, R. (2011). Anatomically distinct dopamine release during anticipation and experience of peak emotion to music Nature Neuroscience DOI: 10.1038/nn.2726

Honing, H. (2011) Musical Cognition. A Science of Listening. New Brunswick, N.J.: Transaction Publishers.

Interested in the relation between dance and music?

Larry Parsons

On Tuesday 16 April 2013  Larry Parsons (University of Sheffield and Centre de Neuroscience Cognitive, CNRS, Lyon, France) will give a CSCA Lecture with the title Neurobiological Basis of Musical Skills and Dancing. He will present functional neuroimaging data on the brain basis of call/response singing, harmonization, improvisational singing, sight-singing duets, music learning in non-musical adults, and the performance of memorized piano pieces. Also discussed will be the relation between neural systems for melodic and sentential generation, emotional musical experiences, and the brain basis of dancing.

For more information, see the website of the CSCA.

Interested in an Assistant Professorship?

The Faculty of Humanities is searching for two Assistant Professors in Musicology (0.5 fte) in the fields of historical, cognitive or cultural musicology. They should be familiar with recent developments in the methodology of musicology and acquainted with current theoretical developments in their respective field. Experience in musical practice and/or experience with digital media and research tools is desirable.  For more information, see here. Deadline for applications is 17 April 2013.

Hebben dieren vrije tijd? [Dutch]

Tijs Goldschmidt

Op vrijdag 19 april spreekt de schrijver en evolutiebioloog Tijs Goldschmidt de derde Kousbroeklezing uit met de titel Vis in bad. De meeste dieren werken periodiek hard, maar er wordt ook veel gelummeld, gehangen en niets gedaan. Hoe kunnen ze zich dat permitteren? Hebben ze 'vrije tijd' of zijn ze schijnvrij? Een beschouwing over zonnetijd, innerlijke tijd, sociale tijd en vooral vrije tijd bij dieren inclusief de mens.

Tijs Goldschmidt is essayist en bioloog. Zijn bekendste boek is Darwins Hofvijver. Hij publiceerde ook verschillende essaybundels. Hij is advisor aan de Rijksakademie van Beeldende Kunsten en gastschrijver van de UvA-Artisbibliotheek (Bijzondere Collecties). In 2004 was hij een van VPRO's zomergasten.

Zie hier voor meer informatie.

Is music a supernormal stimulus?

Fragment of an interview of Richard Dawkins with Steven Pinker for "The Genius of Charles Darwin" (UK Channel 4 Television, 2008).

Pinker explains again why music is not an adaptation but should be seen as a kind of 'supernormal stimulus' - adding the phrase "people in music hate this theory...".

[non-flash version: .mp4,.3gp]

For a full one hour of uncut footage see here.

Honing, H. (2011). Muziek is geen luxe... maar wat dan wel? Academische Boekengids, 88, 2-4.

Honing, H. (2012). If music isn’t a luxury, what is it? Journal of Music, Technology and Education, 5 (1), 114-117 DOI: 10.1386/jmte.5.1.109_5.