Doctor of Philosophy (PhD)
First Advisor's Name
Dr. Jamie Theobald
First Advisor's Committee Title
Second Advisor's Name
Dr. Suzanne Koptur
Second Advisor's Committee Title
Third Advisor's Name
Dr. Philip Stoddard
Third Advisor's Committee Title
Fourth Advisor's Name
Dr. Matthew DeGennaro
Fourth Advisor's Committee Title
Fifth Advisor's Name
Dr. Robert Lickliter
Fifth Advisor's Committee Title
optic flow, attention, drosophila melanogaster, flight control
Date of Defense
To successfully navigate the complex visual world, animals must extract relevant information from the deluge of light-carried signals that arrive at their eyes. Early vision filters are passive, energy-saving gates that block out irrelevant signals. The remaining incoming signals are then subject to active filtering by visual attention systems which are energetically expensive, especially for smaller animals, which are subject to similar survival challenges as larger animals.
Among visual behaviors performed by insects, flight stabilization demands one of the highest rates of information uptake. Flying insects must quickly respond to flight disturbances to avoid navigation errors and collisions. Active flight is energy-intensive, but the variable environmental and flight conditions make passive filtering unreliable to infer self-motion.
Dipterans (flies and mosquitoes) are a prosperous order of insects that owe their success to impressive flying skills. Though many visual adaptations for flight have been well characterized, little research has been dedicated to the active attention processes required for flight stabilization. In this dissertation, I investigated how the visual attention systems of fruit flies work to maximize relevant information uptake during flight. I have focused on three main questions: (1) Do flies shift attention away from regions impacted heavily by motion-blur? (2) Do flies’ attention systems prioritize regions with higher quality images? (3) Does the attention system only filter noisy regions, or does it weigh the regional image quality against other sources of information present?
I used a virtual reality flight arena to convince stationary, tethered fruit flies that they were actually flying. I tested whether flies were attentive to visual regions by showing local perturbations and measuring corrective steering responses. I found that fast-flying flies (1) shift their attention to the slower frontal parts of their visual field; (2) shift their attention forward when flying in dim and low contrast environments; (3) weigh other relevant information with image clarity. My findings provide a better understanding of how the energy-limited visual systems of fruit flies can process all the information required to stabilize flight.
Previously Published In
Palermo, N., & Theobald, J. (2019). Fruit flies increase attention to their frontal visual field during fast forward optic flow. Biology letters, 15(1), 20180767.
Palermo, Nicholas A., "An Information Theoretic Approach to Characterizing the Attention Shifts in the Fruit Fly During Flight" (2021). FIU Electronic Theses and Dissertations. 4789.
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