Lisa Giocomo Explained

Lisa Giocomo
Birth Place:Glenwood Springs, Colorado, U.S
Fields:Neuroscience
Workplaces:Stanford University School of Medicine
Alma Mater:Baylor University, Boston University
Known For:Grid cells

Lisa Giocomo is an American neuroscientist who is a Professor in the Department of Neurobiology at Stanford University School of Medicine. Giocomo probes the molecular and cellular mechanisms underlying cortical neural circuits involved in spatial navigation and memory.

Early life and education

Giocomo grew up in Highlands Ranch, Colorado where she spent a lot of time outdoors.[1] She attributed her early interest in science to her outdoor exploration as a child and thought that pursuing a career in medicine would satisfy her interest in science.[1] Giocomo went on to pursue pre-medical training as an undergraduate student at Baylor University supported by an academic scholarship.[2] Motivated to go into medicine, Giocomo worked as a mental health counsellor at a local clinic as well as at the Veterans Affairs Hospital where she also conducted research on psychiatric illnesses.[1] These research experiences and the experiments she was doing in her psychology class inspired her to major in Psychology.[2] As she began to realize the lack of available treatment options for mental illnesses, she became inspired by her psychology and statistics professor, Dr. Roger Kirk, and changed her path to pursue a deeper understanding of neurobiology instead of medicine.[1] [2]

Giocomo completed her bachelor's degree at Baylor in 2002, graduating with a degree in Psychology and then pursued a master's degree in Psychology at Boston University.[2] Giocomo worked with Dr. Michael Hasselmo to understand how different neuromodulators impact memory processing.[2] She stayed at Boston University to complete her PhD in neuroscience under the mentorship of Hasselmo.[1]  During her PhD, Giocomo published a first author paper in 2005 showing that application of nicotine to hippocampal slices modulates glutamatergic synaptic transmission leading to a longer period of enhanced synaptic transmission.[3] These results might provide insight into the mechanisms through which nicotine has memory-enhancing effects.[3]

After exploring the effects of cholinergic modulation on cortical function[4] as well as the differences between metabotropic glutamate receptor modulatory effects on synaptic transmission,[5] Giocomo began to study grid cells. Grid cells are cells in the cortex that exhibit spatially modulated firing fields that are repeated across the environment to continually update the animal of its position in space. In a first author paper published in Science, Giocomo found that grid cells exhibit differences in frequency of subthreshold membrane potential oscillations in the entorhinal cortex across the dorsal to ventral axis.[6] These findings are in line with the Burgess and O’Keefe Model such that differences in the frequency of subthreshold somatic oscillations results in differences in spatial frequency of grid cell fields.[6] Giocomo further explored the differences in intrinsic properties of medial entorhinal cortical grid cells across the dorsal to ventral axis and, in 2008, published another first author paper outlining how experimental data regarding the physiology of grid cells can be understood in the framework of two possible computational models of grid cells.[7] She concluded that, taking into account the experimental data, both the attractor dynamics and oscillatory interference models help to explain the properties of grid cell firing in the entorhinal cortex.[7]

Giocomo completed her PhD in 2008 and decided to pursue her postdoctoral studies in the Moser Lab where she could test her cellular and computational work from her graduate studies in animals and under the mentorship of the scientists that discovered grid cells.[1] The lab was located at the Center for Neural Computation at the Norwegian University of Science and Technology, so she moved to Norway with her husband for her postdoctoral work.[1] She spent four years in Norway working with the Mosers and published many influential papers that greatly impacted the grid cell field. In 2011, she found that knocking out specific channels in the entorhinal cortex, hyperpolarization-activated cyclic nucleotide-gated channels (HCN), caused the size and spacing of grid fields to expand but the dorsal-ventral gradient of the grid pattern was maintained.[8] In addition to looking at other computational models of grid cells, Giocomo described the function of head direction cells in the entorhinal cortex in a first author paper in Cell.[9] She found that head direction cells are organized topographically.[9] Specifically, the tuning gradient of these cells decreases along the dorsal to ventral axis and the dorsoventral tuning gradient is only expressed in layer III of the entorhinal cortex.[9] Overall, this paper highlighted the fundamental nature of dorsoventral gradients in entorhinal cortex circuits.[9]

Career and research

From 2011 to 2012, Giocomo held the title of Group Leader at the Kavli Institute for Systems Neuroscience at the Norwegian University of Science and Technology. Giocomo was then recruited to Stanford University in 2013 where she held the title of Assistant Professor of Neurobiology until 2018.[10] The Giocomo Lab focuses on the neurobiology of functionally defined cell types in the entorhinal cortex.[10] Studying grid cells, head direction cells and border cells allows Giocomo to perform specific manipulations in a system that offers measurable outputs.[10]

In 2015, Giocomo and her lab discovered novel error correction mechanisms in grid cells.[11] Since grid cells use path integrating in computing the neural representation of an animals location in space, Giocomo and her lab hypothesized that there must be a sort of error-correction mechanism in place in the brain otherwise the error would accumulate and animals would be unable to navigate their environments.[11] They found that grid cells accumulate error relative to time and distance travelled, the error reflects coherent drift in the grid pattern, and lastly that border cells might serve as a neural substrate for error correction.[11] Overall, these findings indicate that landmarks in an animals’ environment are crucial to grid stability.[11] In 2018, Giocomo and her lab explored the impact of grid scale on place scale by knocking out the HCN1 channels to expand the grid scale.[12] They observed that place scale also expanded in areas far from environmental boundaries, and that place field stability was reduced and spatial learning was impaired.[12] These findings highlight the important biological connections between grid cells and place cells in place coding and spatial memory.[12] In 2019, Giocomo's lab explored the malleability of entorhinal spatial maps.[13] They found that the entorhinal maps restructure to incorporate learned reward locations and this restructuring improved positional decoding when the animal was in close proximity to the reward location.[13]

Another goal of the Giocomo Lab's research program is to explore the ontogenesis of medial entorhinal cortex topography to understand how gradients in ion channels develop to give rise to spatial mapping and neural representations of space.[10]

In 2019, Giocomo was promoted to Associate Professor of Neurobiology at Stanford University.[14]

Awards and honors

Select publications

Notes and References

  1. Web site: Neuroscientist studies how brain encodes spatial information. University. © Stanford. Stanford. 2015-05-04. Welcome to Bio-X. en. 2020-04-04. California 94305.
  2. Web site: Medal of Service for Contributions to Research: Lisa Giocomo. Baylor Magazine. Fall 2016. Baylor University. 2020-04-04.
  3. Giocomo. Lisa M.. Hasselmo. Michael E.. 2005. Nicotinic modulation of glutamatergic synaptic transmission in region CA3 of the hippocampus. European Journal of Neuroscience. en. 22. 6. 1349–1356. 10.1111/j.1460-9568.2005.04316.x. 16190890. 15023783. 1460-9568.
  4. Hasselmo. M. E.. Giocomo. L. M.. 2006-02-01. Cholinergic modulation of cortical function. Journal of Molecular Neuroscience. en. 30. 1. 133–135. 10.1385/JMN:30:1:133. 17192659. 8821283. 1559-1166.
  5. Giocomo. Lisa M.. Hasselmo. Michael E.. 2006. Difference in time course of modulation of synaptic transmission by group II versus group III metabotropic glutamate receptors in region CA1 of the hippocampus. Hippocampus. en. 16. 11. 1004–1016. 10.1002/hipo.20231. 17039485. 15547439. 1098-1063.
  6. Giocomo. Lisa M.. Zilli. Eric A.. Fransén. Erik. Hasselmo. Michael E.. 2007-03-23. Temporal Frequency of Subthreshold Oscillations Scales with Entorhinal Grid Cell Field Spacing. Science. en. 315. 5819. 1719–1722. 10.1126/science.1139207. 0036-8075. 17379810. 2950607. 2007Sci...315.1719G.
  7. Giocomo. Lisa M.. Hasselmo. Michael E.. 2008. Computation by oscillations: Implications of experimental data for theoretical models of grid cells. Hippocampus. en. 18. 12. 1186–1199. 10.1002/hipo.20501. 1098-1063. 2653064. 19021252.
  8. Giocomo. Lisa M.. Hussaini. Syed A.. Zheng. Fan. Kandel. Eric R.. Moser. May-Britt. Moser. Edvard I.. 2011-11-23. Grid Cells Use HCN1 Channels for Spatial Scaling. Cell. en. 147. 5. 1159–1170. 10.1016/j.cell.2011.08.051. 22100643. 0092-8674. free.
  9. Giocomo. Lisa M.. Stensola. Tor. Bonnevie. Tora. Van Cauter. Tiffany. Moser. May-Britt. Moser. Edvard I.. 2014-02-03. Topography of Head Direction Cells in Medial Entorhinal Cortex. Current Biology. en. 24. 3. 252–262. 10.1016/j.cub.2013.12.002. 24440398. 0960-9822. free.
  10. Web site: Lisa Giocomo's Profile Stanford Profiles. profiles.stanford.edu. en. 2020-04-04.
  11. Hardcastle. Kiah. Ganguli. Surya. Giocomo. Lisa M.. 2015-05-06. Environmental Boundaries as an Error Correction Mechanism for Grid Cells. Neuron. en. 86. 3. 827–839. 10.1016/j.neuron.2015.03.039. 25892299. 0896-6273. free.
  12. Mallory. Caitlin S.. Hardcastle. Kiah. Bant. Jason S.. Giocomo. Lisa M.. February 2018. Grid scale drives the scale and long-term stability of place maps. Nature Neuroscience. en. 21. 2. 270–282. 10.1038/s41593-017-0055-3. 29335607. 1546-1726. 5823610.
  13. Butler. William N.. Hardcastle. Kiah. Giocomo. Lisa M.. 2019-03-29. Remembered reward locations restructure entorhinal spatial maps. Science. en. 363. 6434. 1447–1452. 10.1126/science.aav5297. 0036-8075. 30923222. 6516752. 2019Sci...363.1447B.
  14. Web site: Lisa Giocomo's Profile Stanford Profiles. profiles.stanford.edu. en. 2020-04-04.
  15. Web site: 2019 Vallee Scholars Announced The Vallee Foundation. www.thevalleefoundation.org. 2020-04-04.
  16. Web site: 2018 Young Investigator Award Recipients. 2018. Office of Naval Research Science and Technology. April 3, 2020.
  17. Web site: Lisa Giocomo and Christopher Harvey receive Young Investigator Award. EurekAlert!. en. 2020-04-04.
  18. Web site: Scholar Award in Understanding Human Cognition. 2016. The James S. McDonnell Foundation. April 3, 2020.
  19. Web site: Lisa Giocomo, PhD. New York Stem Cell Foundation. en-US. 2020-04-04.
  20. Web site: Klingenstein-Simons Fellowship Awards in the Neurosciences. Simons Foundation. en-US. 2020-04-04.
  21. Web site: The Peter and Patricia Gruber International Research Award in Neuroscience Gruber Foundation. gruber.yale.edu. 2020-04-04.
  22. Bant. Jason S.. Hardcastle. Kiah. Ocko. Samuel A.. Giocomo. Lisa M.. 2020-02-18. Topography in the Bursting Dynamics of Entorhinal Neurons. Cell Reports. English. 30. 7. 2349–2359.e7. 10.1016/j.celrep.2020.01.057. 2211-1247. 32075768. 7053254. free.
  23. Munn. Robert G. K.. Mallory. Caitlin S.. Hardcastle. Kiah. Chetkovich. Dane M.. Giocomo. Lisa M.. February 2020. Entorhinal velocity signals reflect environmental geometry. Nature Neuroscience. en. 23. 2. 239–251. 10.1038/s41593-019-0562-5. 31932764. 7007349. 1546-1726.
  24. Campbell. Malcolm G.. Giocomo. Lisa M.. December 2019. How a fly's neural compass adapts to an ever-changing world. Nature. en. 576. 7785. 42–43. 10.1038/d41586-019-03443-1. 31792416. 2019Natur.576...42C. free.
  25. Hardcastle. Kiah. Giocomo. Lisa M.. 3 April 2019. The Shifting Sands of Cortical Divisions. Neuron. 102. 1. 8–11. 10.1016/j.neuron.2019.03.015. 1097-4199. 30946829. free.
  26. Ocko. Samuel A.. Hardcastle. Kiah. Giocomo. Lisa M.. Ganguli. Surya. 2018-12-11. Emergent elasticity in the neural code for space. Proceedings of the National Academy of Sciences. en. 115. 50. E11798–E11806. 10.1073/pnas.1805959115. 0027-8424. 30482856. 6294895. 2018PNAS..11511798O . free.
  27. Campbell. Malcolm G.. Ocko. Samuel A.. Mallory. Caitlin S.. Low. Isabel I. C.. Ganguli. Surya. Giocomo. Lisa M.. August 2018. Principles governing the integration of landmark and self-motion cues in entorhinal cortical codes for navigation. Nature Neuroscience. en. 21. 8. 1096–1106. 10.1038/s41593-018-0189-y. 30038279. 1546-1726. 6205817.
  28. Hardcastle. Kiah. Maheswaranathan. Niru. Ganguli. Surya. Giocomo. Lisa M.. 2017-04-19. A Multiplexed, Heterogeneous, and Adaptive Code for Navigation in Medial Entorhinal Cortex. Neuron. 94. 2. 375–387.e7. 10.1016/j.neuron.2017.03.025. 1097-4199. 5498174. 28392071.
  29. Hardcastle. Kiah. Ganguli. Surya. Giocomo. Lisa M.. 2015-05-06. Environmental boundaries as an error correction mechanism for grid cells. Neuron. 86. 3. 827–839. 10.1016/j.neuron.2015.03.039. 1097-4199. 25892299. free.
  30. Giocomo. Lisa M.. 2016-11-15. Environmental boundaries as a mechanism for correcting and anchoring spatial maps. The Journal of Physiology. 594. 22. 6501–6511. 10.1113/JP270624. 1469-7793. 5108900. 26563618.
  31. Web site: Publications. Giocomo Lab. en. 2020-04-04.
  32. Giocomo. Lisa M.. Zilli. Eric A.. Fransén. Erik. Hasselmo. Michael E.. 2007-03-23. Temporal Frequency of Subthreshold Oscillations Scales with Entorhinal Grid Cell Field Spacing. Science. 315. 5819. 1719–1722. 10.1126/science.1139207. 0036-8075. 2950607. 17379810. 2007Sci...315.1719G.
  33. Giocomo. Lisa M.. Hasselmo. Michael E.. September 2005. Nicotinic modulation of glutamatergic synaptic transmission in region CA3 of the hippocampus. The European Journal of Neuroscience. 22. 6. 1349–1356. 10.1111/j.1460-9568.2005.04316.x. 0953-816X. 16190890. 15023783.

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