Increased attention enhances both behavioral and neuronal performance.

@article{Spitzer1988IncreasedAE,
  title={Increased attention enhances both behavioral and neuronal performance.},
  author={Hartwig Spitzer and Robert Desimone and Julio Mor{\'a}n},
  journal={Science},
  year={1988},
  volume={240 4850},
  pages={338-40}
}
Single cells were recorded from cortical area V4 of two rhesus monkeys (Macaca mulatta) trained on a visual discrimination task with two levels of difficulty. Behavioral evidence indicated that the monkeys' discriminative abilities improved when the task was made more difficult. Correspondingly, neuronal responses to stimuli became larger and more selective in the difficult task. A control experiment demonstrated that changes in general arousal could not account for the effects of task… CONTINUE READING
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In the latter study, the number of errors committed in the different tasks was correlated with the neuronal responses, and the issue oftask difficulty was discussed

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