I am a postdoctoral fellow in the Psychological & Brain Sciences department at Johns Hopkins University. I work with Janice Chen and Christopher Honey. I like to spend my time thinking about how we learn and remember, and why we get lost in stories.
I am curious about what it means to understand something deeply.
How is deep understanding different from memorizing information?
How can we promote deep understanding? What changes in our brain as we achieve it?
Why do we understand stories more readily than other kinds of information?
And what might all of this tell us about the organizing principles of the human mind?
stories change how we think
Stories seem to have a lasting influence on how we think. How do we measure this influence? What are its consequences? In this line of work, I examine how stories can shape our spontaneous thoughts even after they end, using techniques from natural language processing like word embeddings. [talk]
measuring dynamic situation models
We rely on situation models - abstract representations of how specific events tend to unfold - to help understand the world around us. In this line of work, I use techniques from natural language processing to generate a dynamic measure of situation model strength (i.e., inter-subject prediction similarity) during movie-viewing to predict memory and brain activity. [conference paper]
prior knowledge promotes detail-rich memories
If we know a lot about something, will our memory for a specific instance of seeing that thing be richer in detail? Here, I use naturalistic stimuli (e.g., famous faces, popular brands) to test how prior knowledge affects the quality of our memories. [preprint]
hippocampus and memory
The hippocampus, a brain structure tucked deep into our medial temporal lobe, is involved in our ability to remember past events. But, are all parts of the hippocampus equal? Here, we are examining the possibility that different aspects of the hippocampus (anterior vs. posterior) preferentially represent gist-like vs detailed information. [paper]
default mode network
The default mode network, a set of functionally coupled brain regions, plays an important role in a variety of contexts, including: remembering, future imagining, story comprehension, mentalizing, and mind-wandering, among others. Could these regions be ideally situated in the brain to represent our internal models of the external environment? [paper] [commentary]
The cognitive neuroscience of stories
We are constantly surrounded by stories. Could the central role that stories play in human culture shed some light onto the inner workings of our minds and brains? I developed and taught an introductory course exploring how stories are used in cognitive neuroscience. [syllabus] [slides]
I strongly believe in the importance of taking science out of the laboratory and into the community. To that end, I've given introductory lectures on "cognitive neuroscience" to a wide variety of audiences. I'm also very interested in applying concepts from service-learning to psychology and neuroscience.
Bellana, B., Mansour, R., Grady, C.L. & Moscovitch, M. (2019). Prior knowledge facilitates recollection and the formation of durable memories. [link]
Bellana, B., Ladyka-Wojcik, N., Lahan, S., Moscovitch, M. & Grady, C.L. (2019). Activity in the left angular tracks both recollection and prior knowledge during recognition. [link]
Lee, H., Bellana, B., & Chen, J. (2020). What can narratives tell us about the neural bases of human memory? Current Opinion in Behavioral Sciences. 32, 111-119. [pdf]
Ramanan, S. & Bellana, B. (2019, commentary). A domain general role for the angular gyrus in retrieving internal representations of the external world. The Journal of Neuroscience, 39(16), 2978-2980. [pdf]
Brunec, I.K.*, Bellana, B.*, Ozubko, J.D., Man, V., Robin, J., Liu, Z-X., Grady, C.L., Rosenbaum, R.S., Winocur, G., Barense, M.D. & Moscovitch, M. (2018). Multiple scales of representation along the hippocampal anteroposterior axis in humans. Current Biology, 28(13), 2129-2135.e6 [pdf]
Anderson, J.A.E., Chung-Fat-Yim, A., Bellana, B., Luk, G. & Bialystok, E. (2018). Language and cognitive control networks in bilinguals and monolinguals. Neuropsychologia, 117, 351-363. [link]
Bellana, B.*, Liu, Z-X.*, Diamond, N., Grady, C.L. & Moscovitch, M. (2017). Similarities and differences in the default mode network across rest, retrieval and future imagining. Human Brain Mapping, 38(3): 1155-1171. [pdf]
Anderson, J.A.E., Sarraf, S., Amer, T., Bellana, B., Man, V., Campbell, K.L., Hasher, L. &
Grady, C.L. (2017). Task-linked diurnal brain network reorganization in older adults: A graph theoretical approach. Journal of Cognitive Neuroscience, 29(3), 560-572. [link]
Bellana, B., Liu, Z., Anderson, J.A.E., Moscovitch, M. & Grady, C.L. (2016). Laterality effects in functional connectivity of the angular gyrus during rest and episodic retrieval. Neuropsychologia, 80(8): 24-34. [pdf]
Greenberg, A., Bellana, B. & Bialystok, E. (2013). Perspective-taking ability in bilingual children: Extending advantages in executive control to spatial reasoning. Cognitive Development, 28(1): 41-50. [pdf]
cool things (from the internet)
Science has more faces than we might realize. Kudos to SPARK Society for putting together this (growing) list of cognitive scientists of colour.
Interactive fiction, where you collaborate with transformer models to create a story world of your own.
Word2Vec embedding space, but like, space. Fun and interactive way to get a handle on word embeddings.
An exhaustingly large, if not exhaustive, list of common tropes in TV and movies.
A massive database of freely available speculative (i.e.,sci-fi/fantasy) fiction.
A whole world of (interactive) storytelling.
Icons for everything.
Hello! I'm Buddhika.
I received my PhD from the Department of Psychology at the University of Toronto, under the supervision of Cheryl Grady and Morris Moscovitch. I studied the neural bases and behavioural consequences of interactions between new learning and prior knowledge.
My thesis was driven by an interest in a network of brain regions known as the default mode network (DMN). I wanted to know why the DMN was particularly sensitive to stimuli with rich associations that extend beyond their physical properties (e.g., a face we recognize from our lives vs. one we don't; a word we can recollect from a studied list vs. a new word).
Could these regions be ideally situated in the brain to represent our internal models of the external environment? Considering the associative nature of our learning system, can this framework shine light onto the neural bases of a deep understanding?
I am now a postdoctoral fellow with Janice Chen and Christopher Honey in the Psychological & Brain Sciences department at Johns Hopkins University. I use narratives, online experiments and naturalistic neuroimaging paradigms, to develop cognitive and neural models of phenomena related to deep understanding.