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Temporal processing of saccade targets in parietal cortex area LIP during visual search
1Neuroscience Graduate Program, Centre for Neuroscience Studies, Queen's University, Kingston, Ontario K7L 3N6, Canada.
Journal of Neurophysiology
|November 3, 2006
Summary
Neurons in the lateral intraparietal (LIP) area help select targets during visual search. LIP activity signals the search target before eye movements, aiding in visual guidance.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Systems Neuroscience
Background:
- The lateral intraparietal (LIP) area is a key region in the parietal cortex.
- It is anatomically situated between visual processing areas and areas controlling eye movements (saccades).
Purpose of the Study:
- To investigate if LIP neurons contribute to target selection during visual search.
- To understand the role of LIP activity in active visual search processes.
Main Methods:
- Recorded neuronal activity in the LIP area of monkeys performing a visual search task.
- Monkeys searched for a color-different target among distractors.
- Analyzed LIP neuron responses relative to stimulus presentation and saccade initiation.
Main Results:
- Initially, LIP neurons responded non-selectively to visual stimuli within their receptive fields.
- LIP neuronal activation evolved to discriminate the search target before saccade initiation.
- An ideal observer could discriminate the target from 60% of LIP neurons' activity, on average, 138 ms post-stimulus and 26 ms before saccade.
Conclusions:
- LIP neuronal activity reflects the selection of the visual search target.
- LIP activity is involved in selecting the saccade target during active visual search.
- The timing of LIP target discrimination correlates with behavioral reaction times.
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