Neuronal Correlates of the Set-Size Effect in Monkey Lateral Intraparietal Area
Author Information
Author(s): Balan Puiu F, Oristaglio Jeff, Schneider David M, Gottlieb Jacqueline
Primary Institution: Columbia University
Hypothesis
The set-size effect reflects a form of attentional interference rather than visual interference.
Conclusion
The study found that competitive visuo-visual interactions in the lateral intraparietal area contribute to capacity limitations in visual searches.
Supporting Evidence
- Neurons in the lateral intraparietal area encoded target location during visual search.
- Firing rates associated with both target and distractors decreased with increasing distractor numbers.
- The set-size effect was significant in 70% of sessions.
- Each additional distractor increased reaction time by approximately 10 ms.
- Neuronal firing rates correlated with reaction time both within and across set sizes.
Takeaway
When monkeys looked for a target among many distractions, their brain activity showed that more distractions made it harder to find the target.
Methodology
Monkeys performed a covert visual search task while their neuronal activity was recorded in the lateral intraparietal area.
Limitations
The study was conducted on a small sample of monkeys, which may limit the generalizability of the findings.
Participant Demographics
Two adult rhesus monkeys (one male and one female) were used in the study.
Statistical Information
P-Value
p<0.01
Confidence Interval
[5.8, 15.5]
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
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