Related Experiment Videos
Neural correlates of saccade planning in infants: a high-density ERP study
G Csibra1, L A Tucker, M H Johnson
1Cognitive Development Unit, Medical Research Council, London, UK. g.csibra@cdu.ucl.ac.uk
Insights
Infants show early frontal cortex involvement in action control, but lack adult-like cortical saccade planning by 6 months. This study used event-related potentials to investigate neural correlates of saccade planning in infants.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Cognitive Neuroscience
Background:
- Saccade planning involves complex neural processes, including cortical involvement.
- Understanding infant neural development is crucial for identifying early markers of cognitive function.
Purpose of the Study:
- To investigate the neural correlates of saccade planning in 6-month-old infants using high-density event-related potentials.
- To compare infant saccade planning with adult patterns, focusing on pre-saccadic cortical activity.
Main Methods:
- High-density event-related potentials (ERPs) were recorded from 6-month-old infants.
- Participants performed saccades to a target stimulus in gap and overlap trial conditions.
- Behavioral saccade latencies and electrophysiological signals were analyzed.
Main Results:
- Infants exhibited longer saccade latencies in overlap trials compared to gap trials, similar to adults.
- Infants did not display clear pre-saccadic components typically seen in adult cortical saccade planning.
- A left frontal positivity, potentially reflecting cortical disinhibition, and post-saccadic lambda waves were observed.
Conclusions:
- The frontal cortex appears to play a role in action control in infants as young as 6 months.
- Certain aspects of cortical saccade planning, as observed in adults, may not be fully developed in infants in specific task contexts.
- These findings provide insights into the developmental trajectory of action control and cortical networks in early infancy.
Abstract:
Neural correlates of saccade planning in 6-month-old infants were investigated by high-density event-related potentials. Subjects made saccades to a target stimulus following a time gap from fixation stimulus offset (gap trials) or with the fixation stimulus still present (overlap trials). Like adults, infants were slower to make a saccade to the target when the fixation stimulus was still present. Strikingly, infants did not show clear evidence of the pre-saccadic components observed in adults which are thought to reflect cortical saccade planning processes. They did, however, show a left frontal positivity, which we suggest reflects cortical disinhibition of the colliculus initiated by fixation stimulus offset, and clear post-saccadic lambda waves. These results indicate that the frontal cortex already plays a role in action control by 6 months of age, while other aspects of cortical action planning may not yet be present in certain task situations.