PEER-REVIEWED PRIMARY PUBLICATIONS 

• dos Santos, E. B,  Mori, C., Kim, K., Kim, K., Tachibana, R. O., Jeong, O,, Lee, J., & Kojima, S. (2025) Why early birds sing early: rebound singing from nighttime suppression can explain dawn chorus. bioRxiv, doi: https://doi.org/10.1101/2025.09.29.679172.

• Mori, C., Jeong,O., Kim, Y., & Kojima, S. (2025) Neural activation in a septal area is related to intrinsic motivation for non-courtship singing in adult zebra finches. Scientific Reports 15 (1): 11452.

• Kang, H., dos Santos, E. B., & Kojima, S. (2024) Neural sensitivity to frequency changes in song structure in a high-order auditory area reflects tutor song memory in adult songbirds. Brain Structure and Function 230:11.  

• Mizuguchi, D., Sánchez-Valpuesta, M., Kim, Y., dos Santos, E. B., Kang, H., Mori, C., Wada, K., and Kojima, S. (2024) Daily singing of adult songbirds functions to maintain song performance independently of auditory feedback and age. Communications Biology 7: 598.

• Kim, Y., Mori, C., and Kojima, S. (2022) Effect of darkness on intrinsic motivation for undirected singing in Bengalese finch (Lonchura striata domestica): a comparative study with zebra finch (Taeniopygia guttata). Frontiers in Physiology 13: 884404.

• Kim Y, Kojima S. (2022) Contribution of Endocannabinoids to Intrinsic Motivation for Undirected Singing in Adult Zebra Finches. Frontiers in Physiology 13:882176.

• Tachibana, R. O., Lee, D., Kai, K., and Kojima, S. (2022) Performance-dependent consolidation of learned vocal changes in adult songbirds. Journal of Neuroscience 42 (10) 1974-1986. 

• Kim, Y., Kwon, S., Rajan, R., Mori, C., and Kojima, S. (2021) Intrinsic motivation for singing in songbirds is enhanced by temporary singing suppression and regulated by dopamine. Scientific Reports 11(1):20350.

• Kim, Y., Mizuguchi, D., and Kojima, S. (2020) Long-Term Devocalization of Zebra Finches. Bio-protocol 10(18): e3752.

• Iwashita, M., Nomurab, T., Suetsuguc, T., Matsuzaki, F., Kojima, S., and Kosodo, Y. (2020) Comparative analysis of brain stiffness among amniotes using glyoxal fixation and atomic force microscopy. Frontiers in Cell and Developmental Biology 8: 574619

• Nakai, J., Totani, Y., Kojima, S., Sakakibara, M., and Ito, E. (2020) Features of behavioral changes underlying conditioned taste aversion in the pond snail Lymnaea stagnalis. Invertebrate Neuroscience 20(2), 8.

• Sánchez-Valpuesta, M., Suzuki, Y., Shibata, Y., Toji, N., Ji, Y., Afrin, N., Asogwa, C.N., Kojima, I., Mizuguchi, D., Kojima, S., Okanoya, K., Okado, H., Kobayashi, K., and Wada, K. (2019) Corticobasal ganglia projecting neurons are required for juvenile vocal learning but not for adult vocal plasticity in songbirds. Proc. Natl. Acad. Sci. USA, 116(45),22833-22843 

• Daliparthi, V.K., Tachibana, R.O., Cooper, B.G., Hahnloser, R.H.R., Kojima, S., Sober, S.J., and Roberts, T.F. (2019) Transitioning between preparatory and precisely sequenced neuronal activity in production of a skilled behavior. eLife 8, e43732.

• Rao, R., Kojima, S. and Rajan, R. (2019) Sensory feedback independent pre-song vocalizations correlate with time to song initiation.  Journal of Experimental Biology 2019, 222.

•  Kojima, S.*, Kao, M.H., Doupe, A.J., and Brainard, M.S. (2018) The avian basal ganglia are a source of rapid behavioral variation that enables vocal motor exploration. Journal of Neuroscience 38, 9635-9647.  *Corresponding author

• Kojima, S. (2018). Science of songbirds: Mechanisms of how animals acquire complex vocal patterns by learning.  IPSJ SIG Technical Report, 2018-MUS-119, Vol. 6, 1-3.

• Kojima, S. (2016). Song learning in songbirds. In Animal Science Wiki (peer-reviewed). 

• Kojima, S., Sunada, H., Mita, K., Sakakibara, M., Lukowiak, K. and Ito, E. (2015) Function of insulin in snail brain in associative learning. Journal of Comparative Physiology A 201, 969-981, Review

• Kojima, S. and Wada, K. (2015). Science of birdsong: acoustic analyses of birdsong and preference tests.  In Methods of animal experiments: Researchers' special recipes, Vol.3.  Kyoritsu Shuppan Co., ISBN:978-4-320-05774-6 

• Kojima, S., Kao, M.H. and Doupe, A.J. (2013). Task-related ‘cortical’ bursting depends critically on basal ganglia input and is linked to vocal plasticity.  Proc. Natl. Acad. Sci. USA 110, 4756-4761.

• Ito, E., Kojima, S., Lukowiak, K. and Sakakibara, M. (2013). From likes to dislikes: conditioned taste aversion in the pond snail Lymnaea stagnalis. Canadian Journal of Zoology, 91, 405-412, Review

• Kojima, S. (2013). Firing patterns rather than firing rates: The analysis of basal ganglia function in songbirds. Neuroscience Topics of the Japan Neuroscience Society

• Kojima, S. (2012). Neural mechanisms of birdsong learning: basal ganglia circuits and reinforcement learning model. Comparative Physiology and Biochemistry 29, 58-69, Review in Japanese

• Kojima, S. (2012). Vocal learning. In Neuroscience Wiki

• Kojima, S., and Doupe, A.J. (2011). Social performance reveals unexpected vocal competency in young songbirds.  Proc. Natl. Acad. Sci. USA 108, 1687-1692.

• Kojima, S., and Doupe, A.J. (2009). Activity propagation in an avian basal ganglia-thalamocortical circuit essential for vocal learning. The Journal of Neuroscience 29, 4782-4793.

• Kojima, S., and Doupe, A.J. (2008). Neural encoding of auditory temporal context in a songbird basal ganglia nucleus, and its independence of birds' song experience. European Journal of Neuroscience 27, 1231-1244.

• Kojima, S., and Doupe, A.J. (2007). Song selectivity in the pallial-basal ganglia song circuit of zebra finches raised without tutor song exposure. Journal of Neurophysiology 98, 2099-2109.

• Kinoshita, M., Fukaya, M., Tojima, T., Kojima, S., Ando, H., Watanabe, M., Urano, A., and Ito, E. (2005). Retinotectal transmission in the optic tectum of rainbow trout. Journal of Comparative Neurology 484, 249-259. 

• Kojima, S., and Aoki, K. (2003). Intrinsic and synaptic properties of the dorsomedial nucleus of the intercollicular complex, an area known to be involved in distance call production in Bengalese finches. Brain Research 966, 84-94.

• Kinoshita, M., Ueda, R., Kojima, S., Sato, K., Watanabe, M., Urano, A., and Ito, E. (2002). Multiple-site optical recording for characterization of functional synaptic organization of the optic tectum of rainbow trout. European Journal of Neuroscience 16, 868-876.

• Kojima, S., Hosono, T., Fujito, Y., and Ito, E. (2001). Optical detection of neuromodulatory effects of conditioned taste aversion in the pond snail Lymnaea stagnalis. Journal of Neurobiology 49, 118-128.

• Kojima, S. (2001). Neuroethological analyses of associative learning in the pond snail, Lymnaea stagnalis. The Bulletin of Sophia University

• Kojima, S., Ogawa, H., Kouuchi, T., Nidaira, T., Hosono, T., and Ito, E. (2000). Neuron-independent Ca2+ signaling in glial cells of snail's brain. Neuroscience 100, 893-900.

• Hatakeyama, D., Ito, I., Kojima, S., Fujito, Y., and Ito, E. (2000). Complement receptor 3-like immunoreactivity in the light green cells and the canopy cells of the pond snail, Lymnaea stagnalis. Brain Research 865, 102-106.

• Sadamoto, H., Yamanaka, M., Hatakeyama, D., Nagayama, S., Kojima, S., Yamashita, M., and Ito, E. (2000). Developmental study of anatomical substrate for conditioned taste aversion in Lymnaea stagnalis. Zoological Science 17, 141-148.

• Kojima, S., Nakamura, T., Nidaira, T., Nakamura, K., Ooashi, N., Ito, E., Watase, K., Tanaka, K., Wada, K., Kudo, Y., et al. (1999). Optical detection of synaptically induced glutamate transport in hippocampal slices. The Journal of Neuroscience 19, 2580-2588.

• Nakamura, H., Ito, I., Kojima, S., Fujito, Y., Suzuki, H., and Ito, E. (1999a). Histological characterization of lip and tentacle nerves in Lymnaea stagnalis. Neuroscience Research 33, 127-136.

• Nakamura, H., Kobayashi, S., Kojima, S., Urano, A., and Ito, E. (1999b). PKA-dependent regulation of synaptic enhancement between buccal motor neuron and its regulatory interneuron in Lymnaea stagnalis. Zoological Science 16, 387-394.

• Nakamura, H., Kojima, S., Kobayashi, S., Ito, I., Fujito, Y., Suzuki, H., and Ito, E. (1999c). Physiological characterization of lip and tentacle nerves in Lymnaea stagnalis. Neuroscience Research 33, 291-298.

• Yamanaka, M., Sadamoto, H., Hatakeyama, D., Nakamura, H., Kojima, S., Kimura, T., Yamashita, M., Urano, A., and Ito, E. (1999). Developmental changes in conditioned taste aversion in Lymnaea stagnalis. Zoological Science 16, 9-16.

• Kojima, S., Kobayashi, S., Yamanaka, M., Sadamoto, H., Nakamura, H., Fujito, Y., Kawai, R., Sakakibara, M., and Ito, E. (1998). Sensory preconditioning for feeding response in the pond snail, Lymnaea stagnalis. Brain Research 808, 113-115.

• Ito, E., Kobayashi, S., Kojima, S., Sadamoto, H., and Hatakeyama, D. (1999). Associative learning in the pond snail, Lymnaea stagnalis. Zoological Science 16, 711-723, Review

• Sadamoto, H., Hatakeyama, D., Kojima, S., Fujito, Y., and Ito, E. (1998). Histochemical study on the relation between NO-generative neurons and central circuitry for feeding in the pond snail, Lymnaea stagnalis. Neuroscience Research 32, 57-63.

• Kobayashi, S., Kojima, S., Yamanaka, M., Sadamoto, H., Nakamura, H., Fujito, Y., Kwai, R., Skakibara, M., and Ito, E. (1998). Operant conditioning of escape behavior in the pond snail, Lymnaea stagnalis. Zoological Science 15, 683-690.

• Kojima, S., Nanakamura, H., Nagayama, S., Fujito, Y., and Ito, E. (1997). Enhancement of an inhibitory input to the feeding central pattern generator in Lymnaea stagnalis during conditioned taste-aversion learning. Neuroscience Letters 230, 179-182.

• Kojima, S., Yamanaka, M., Fujito, Y., and Ito, E. (1996). Differential neuroethological effects of aversive and appetitive reinforcing stimuli on associative learning in Lymnaea stagnalis. Zoological Science 13, 803-812. 

OTHER PUBLICATIONS

• Kojima, S. (2018). Science of songbirds: Mechanisms of how animals acquire complex vocal patterns by learning.  IPSJ SIG Technical Report, 2018-MUS-119, Vol. 6, 1-3.

• Kojima, S. (2016). Song learning in songbirds. In Animal Science Wiki.

• Kojima, S. and Wada, K. (2015). Science of birdsong: acoustic analyses of birdsong and preference tests.  In Methods of animal experiments: Researchers' special recipes, Vol.3.  Kyoritsu Shuppan Co., ISBN:978-4-320-05774-6

• Kojima, S. (2013). Firing patterns rather than firing rates: The analysis of basal ganglia function in songbirds. Neuroscience Topics of the Japan Neuroscience Society

• Kojima, S. (2012). Vocal learning. In Neuroscience Wiki

• Kojima, S. (2001). Neuroethological analyses of associative learning in the pond snail, Lymnaea stagnalis. The Bulletin of Sophia University

POPULAR MEDIA

• The secrets of foreign language learning, do songbirds know?  Donga Science Magazine, Sep 19, 2017 (Korean)

• Tweeting teenage songbirds reveal impact of social cues on learning. Science Blog, Feb 25, 2011 Tweeting teenage songbirds reveal impact of social cues on learning. eScience News, Feb 26, 2011

• Teenage Male Songbird Provides Clues to Human Learning. Digital Journal, Feb 26, 2011

• Boy birds sing better with girl birds. USA Today, Mar 1, 2011

• Showing Off For The Girls, PBS: Public Broadcasting Service, Mar 4. 2011

• The zebra finch: juvenile male birds sing adult song with female birds.  Mainichi Shimbun, Feb 3, 2011 (Japanese)