Hen­drik Hartmann

Hendrik Hartmann

PhD can­di­date

Uni­ver­si­ty of Helsinki
Behav­iour­al & Brain Sciences
Fac­ul­ty of Medicine
Depart­ment of Psy­chol­o­gy and Logopedics
Haart­maninkatu 3
00290 Helsinki
Finland 

       

Profile

Dur­ing his mas­ter’s the­sis at the Uni­ver­si­ty of Kon­stanz Hen­drik inves­ti­gat­ed the effect of train­ing inten­si­ty on short- and long-term mem­o­ry in hon­ey­bees. For his PhD he switched his focus to human neu­ro­sciences and start­ed work­ing in the O’Brain Lab in May 2017. Here he is inves­ti­gat­ing how obe­si­ty and dif­fer­ent styles of diet manip­u­late our brain, espe­cial­ly the dopamin­er­gic sys­tem. The main ques­tion is if diet itself already can change the way our brain works, and our abil­i­ty to learn and han­dle cog­ni­tive tasks. For this pur­pose, he is using behav­ioral test­ing and neu­roimag­ing and com­bines these with a genet­ic approach.

Curriculum Vitae

2021— PhD Stu­dent, Depart­ment of Psy­chol­o­gy and Logo­pe­dics, Uni­ver­si­ty of Helsinki
2017— PhD Stu­dent, SFB 1052 “Obe­si­ty Mech­a­nisms”, Max Planck Insti­tute for Human Cog­ni­tive and Brain Sci­ences, Research Group “Deci­sion-mak­ing in Obe­si­ty: Neu­ro­bi­ol­o­gy, Behav­ior, and Plas­tic­i­ty” (Annette Horstmann, Phd)
2015–2017 Research Assis­tant, Depart­ment of Zool­o­gy and Neu­ro­bi­ol­o­gy, Uni­ver­si­ty of Konstanz
2012–2013 Vis­it­ing Grad­u­ate Stu­dent, Smith­son­ian Trop­i­cal Research Insti­tute, Pana­ma City, Panama
2011–2014 Mas­ter of Sci­ence in Bio­log­i­cal Sci­ences, Uni­ver­si­ty of Konstanz
2008–2011 Bach­e­lor of Sci­ences in Bio­log­i­cal Sci­ences, Uni­ver­si­ty of Konstanz

Publications

Papers

Her­zog, N., Hart­mann, H., Janssen, L., Kanyamib­wa, A., Walt­mann, M., Kovacs, P., Deser­no, L., Fal­lon, S., Vill­ringer, A., & Horstmann, A. (2024). Work­ing mem­o­ry gat­ing in obe­si­ty is mod­er­at­ed by stri­atal dopamin­er­gic gene vari­ants. eLife, 13: RP93369. doi:10.7554/eLife.93369.
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Her­zog, N., Hart­mann, H., Janssen, L., Walt­mann, M., Fal­lon, S. J., Deser­no, L., & Horstmann, A. (2024). Work­ing mem­o­ry gat­ing in obe­si­ty: Insights from a case-con­trol fMRI study. Appetite, 195: 107179. doi:10.1016/j.appet.2023.107179.
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Lam­mert, M., Medawar, E., Hart­mann, H., Grass­er, L., Diet­rich, A., Fenske, W., & Horstmann, A. (2023). Dis­tinct adap­ta­tions of endocrine and cog­ni­tive func­tions may con­tribute to high vari­abil­i­ty in long-term weight loss out­come after bariatric surgery. Phys­i­ol­o­gy & Behav­ior, 269: 114279. doi:10.1016/j.physbeh.2023.114279.
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Hart­mann, H., Janssen, L. K., Her­zog, N., Morys, F., Fängström, D., Fal­lon, S. J., & Horstmann, A. (2023). Self-report­ed intake of high-fat and high-sug­ar diet is not asso­ci­at­ed with cog­ni­tive sta­bil­i­ty and flex­i­bil­i­ty in healthy men. Appetite, 183: 106477. doi:10.1016/j.appet.2023.106477.
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Hart­mann, H., Pauli, L., Janssen, L., Huhn, S., Ceglarek, U., & Horstmann, A. (2020). Pre­lim­i­nary evi­dence for an asso­ci­a­tion between intake of high-fat high-sugar diet, vari­a­tions in periph­er­al dopamine pre­cur­sor avail­abil­i­ty and dopamine-dependent cog­ni­tion in humans. Jour­nal of Neuroendocrinology, 32(12): e12917. doi:10.1111/jne.12917.
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Janssen, L., Her­zog, N., Walt­mann, M., Breuer, N., Wiencke, K., Rausch, F., Hart­mann, H., Poes­sel, M., & Horstmann, A. (2019). Lost in trans­la­tion?: On the need for con­ver­gence in ani­mal and human stud­ies on the role of dopamine in diet-induced obe­si­ty. Cur­rent Addic­tion Reports, 6(3), 229–257. doi:10.1007/s40429-019–00268‑w.
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Posters

Her­zog, N., Hart­mann, H., Janssen, L. K., Kanyamib­wa, A., Walt­mann, M., Kovacs, P., Deser­no, L., Fal­lon, S. J., Vill­ringer, A., & Horstmann, A. (2023). Impaired updat­ing of work­ing mem­o­ry rep­re­sen­ta­tions in indi­vid­u­als with high BMI. Poster pre­sent­ed at 10th Mind­Brain­Body Sym­po­sium, Berlin, Ger­many.
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Rausch, F., Hart­mann, H., Janssen, L., John, D., Kovacs, P., & Horstmann, A. (2022). The asso­ci­a­tion of self-report­ed intake of fat and sug­ar with mRNA expres­sion of dopamin­er­gic genes in the blood. Poster pre­sent­ed at 29th Annu­al Meet­ing of the Soci­ety for the Study of Inges­tive Behav­ior (SSIB), Por­to, Por­tu­gal.
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Rausch, F., Hart­mann, H., Janssen, L., John, D., Kovacs, P., & Horstmann, A. (2022). The asso­ci­a­tion of self-report­ed intake of fat and sug­ar with periph­er­al expres­sion of dopamin­er­gic genes. Poster pre­sent­ed at Inter­na­tion­al Con­fer­ence of Cog­ni­tive Neu­ro­science 2020, Helsin­ki, Fin­land.
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Hart­mann, H., Her­zog, N., Janssen, L., Morys, F., Fal­lon, S. J., & Horstmann, A. (2021). Asso­ci­a­tion of dietary fat and sug­ar and body weight with dopamine depen­dent sta­bil­i­ty and flex­i­bil­i­ty of work­ing mem­o­ry rep­re­sen­ta­tions. Poster pre­sent­ed at 28th Annu­al Vir­tu­al Meet­ing of the Soci­ety for the Study of Inges­tive Behav­ior (SSIB), Vir­tu­al.
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Janssen, L., Hart­mann, H., & Horstmann, A. (2020). Diet-depen­dent effects of amisul­pride on rein­force­ment learn­ing and work­ing mem­o­ry in humans. Poster pre­sent­ed at 16th Leipzig Research Fes­ti­val of Life Sci­ences, Stu­dien­zen­trum der Medi­zinis­chen Fakultät, Uni­ver­si­ty Leipzig, Ger­many.
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Rausch, F., Hart­mann, H., Janssen, L., Schleinitz, D., Kovacs, P., & Horstmann, A. (2020). Diet-asso­ci­at­ed dif­fer­ences in periph­er­al dopamine gene expres­sion and their inter­ac­tion with cog­ni­tive per­for­mance in humans. Poster pre­sent­ed at 16th Leipzig Research Fes­ti­val of Life Sci­ences, Stu­dien­zen­trum der Medi­zinis­chen Fakultät, Uni­ver­si­ty Leipzig, Ger­many.
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Hart­mann, H., Pauli, L., Janssen, L., Huhn, S., Ceglarek, U., & Horstmann, A. (2019). Inter­ac­tion of dopamine deple­tion and high-fat/­sug­ar diet on rein­force­ment learn­ing and work­ing mem­o­ry in humans. Poster pre­sent­ed at 27th Annu­al Meet­ing of the Soci­ety for the Study of Inges­tive Behav­ior (SSIB), Utrecht, Nether­lands.
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Rausch, F., Hart­mann, H., Janssen, L., Schleinitz, D., Kovacs, P., & Horstmann, A. (2019). Diet-asso­ci­at­ed dif­fer­ences in periph­er­al dopamine gene expres­sion and their inter­ac­tion with cog­ni­tive per­for­mance in humans. Poster pre­sent­ed at 3rd Nordic Neu­ro­science Meet­ing, Helsin­ki, Fin­land.
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Hart­mann, H., Pauli, L., Janssen, L., Huhn, S., Ceglarek, U., & Horstmann, A. (2019). Inter­ac­tion of dopamine deple­tion and high-fat/­sug­ar diet on rein­force­ment learn­ing and work­ing mem­o­ry in humans. Poster pre­sent­ed at 3rd Nordic Neu­ro­science Meet­ing, Helsin­ki, Fin­land.
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Janssen, L., Hart­mann, H., & Horstmann, A. (2019). Diet-depen­dent effects of amisul­pride on rein­force­ment learn­ing and work­ing mem­o­ry in humans. Poster pre­sent­ed at 3rd Nordic Neu­ro­science Meet­ing, Helsin­ki, Fin­land.
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Hart­mann, H., Rausch, F., & Kobel, M. (2019). Inves­ti­gat­ing the inter­play between diet, dopamine and cog­ni­tive per­for­mance. Poster pre­sent­ed at Retreat Col­lab­o­ra­tive Research Coun­cil 1052 “Obe­si­ty Mech­a­nism”, Grim­ma, Ger­many.
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Pauli, L., Hart­mann, H., Janssen, L., Ceglarek, U., & Horstmann, A. (2018). The influ­ence of high fat and sug­ar diet on the dopamin­er­gic sys­tem and rein­force­ment learn­ing. Poster pre­sent­ed at Retreat Col­lab­o­ra­tive Research Coun­cil 1052 “Obe­si­ty Mech­a­nism”, Grim­ma, Ger­many.
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Talks

Hart­mann, H., Pauli, L., Janssen, L., & Horstmann, A. (2018). Are you real­ly what you eat?: An update on diet, dopamine and the brain peo­ple. Talk pre­sent­ed at Retreat Col­lab­o­ra­tive Research Coun­cil 1052 “Obe­si­ty Mech­a­nism”. Leipzig, Ger­many. 2018-11-30 — 2018-11-30.
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