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The laminar development of direction selectivity in ferret visual cortex.
Jared M Clemens1, Neil J Ritter, Arani Roy
1Department of Biology, Brandeis University, Waltham, Massachusetts 02454, USA.
Summary
Visual experience shapes brain development. Direction selectivity in ferret visual cortex emerges after eye opening, with distinct changes in layers 4 and 2/3 over time, indicating experience-dependent circuit refinement.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Visual System Development
Background:
- Sensory experience is crucial for developing cortical circuits.
- Ferret visual cortical neurons gain direction selectivity after eye opening, a process dependent on visual experience.
Purpose of the Study:
- To investigate the circuit mechanisms underlying the development of direction selectivity.
- To examine the laminar chronology of direction selectivity development around eye opening.
Main Methods:
- Utilized microelectrodes to record neural activity in ferret visual cortex.
- Analyzed the development of orientation and direction selectivity across cortical layers.
- Examined changes in neural responses related to preferred and null directions.
Main Results:
- Weak direction selectivity was observed in layers 4 and 2/3 before eye opening.
- Postnatal day 35 (PND 35) marked a significant increase in direction selectivity in both layers 4 and 2/3.
- Early increases in selectivity were due to enhanced preferred direction responses, while later increases involved reduced null direction responses.
Conclusions:
- Direction selectivity development is a protracted process influenced by visual experience.
- Both layer 4 and 2/3 are dynamically modified during experience-dependent development.
- Sensory stimulation impacts all cortical layers during early development.
Related Concept Videos
01:24Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
01:21Association Areas of the Cortex
Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...