Related Experiment Videos
Coordinated movement is influenced by prenatal light experience in bobwhite quail chicks (Colinus virginianus)
Starlie C Belnap1, Robert Lickliter1
1Department of Psychology, Florida International University, United States.
Insights
Prenatal light exposure significantly impacts bobwhite quail hatchlings' motor coordination and stability. This study reveals complex relationships between light conditions and the development of motor skills, not a simple linear decline.
Area of Science:
- Neuroscience
- Developmental Biology
- Animal Behavior
Background:
- Sensory-motor development starts during embryogenesis and is shaped by sensory input.
- Prenatal factors influencing motor coordination development are not well understood.
- Light exposure is a critical sensory experience during development.
Purpose of the Study:
- To investigate the influence of prenatal light experience on motor coordination in bobwhite quail hatchlings.
- To determine the extent to which prenatal light affects motor skill development and stability.
- To explore the relationship between prenatal light exposure, age, and motivation.
Main Methods:
- Quail embryos were incubated under varied light conditions: no light (dark), 2 hours (2HR), 6 hours (6HR), and diffused sunlight (controls).
- Hatchlings' locomotion, stability (falls), and motivation were assessed via runway video recordings at 12, 24, and 48 hours post-hatch.
- Analysis focused on forward locomotion, fall frequency, and task completion motivation.
Main Results:
- Hatchling motor coordination did not show a uniform improvement with age as hypothesized.
- Reduced prenatal light exposure did not result in a linear decline in motor coordination.
- Specific light conditions (6HR, 2HR) exhibited unique patterns of motor stability and instability.
- A decrease in motivation was observed in the 6HR group.
Conclusions:
- Prenatal light exposure plays a significant role in the development of postnatal motor coordination in quail.
- The relationship between prenatal light and motor development is complex, involving distinct patterns of stability and instability.
- Findings suggest light influences neurodevelopmental processes critical for motor control.
Abstract:
Sensory-motor development begins early during embryogenesis and is influenced by sensory experience. Little is known about the prenatal factors that influence the development of motor coordination. Here we investigated whether and to what extent prenatal light experience can influence the development of motor coordination in bobwhite quail hatchlings. Quail embryos were incubated under four light conditions: no light (dark), 2h of total light (2HR), 6h of total light (6HR), and diffused sunlight (controls). Hatchlings were video recording walking down a runway at three developmental ages (12, 24, and 48h). Videos were assessed for forward locomotion, a measurement of motor coordination, falls, a measurement of motor instability, and motivation to complete the task. We anticipated a linear decline of coordination with a reduction in prenatal light experience and improved coordination with age. Furthermore, as motor coordination becomes more laborious we anticipated motivation to complete the task would decline. However, our findings revealed hatchlings did not uniformly improve with age as expected, nor did the reduction of light result in a linear reduction in motor coordination. Instead, we found a more complex relationship with 6HR and 2HR hatchlings showing distinct patterns of stability and instability. Similarly, we found a reduction in motivation within the 6HR light condition. It appears that prenatal light exposure influences the development of postnatal motor coordination and we discuss these finding in light of neurodevelopmental processes influenced by light experience.