We thank Gustavo Santos, Leyre Castro, and Anne Theobald for their assistance in editing this manuscript. We also thank Azusa Yokota for her help in collecting the data.
Perception of neon-color spreading in squirrel monkeys1
Article first published online: 16 SEP 2009
© Japanese Psychological Association 2009.
Japanese Psychological Research
Special Issue: Divergence of comparative cognitive studies in Japan
Volume 51, Issue 3, pages 132–145, September 2009
How to Cite
NAGASAKA, Y., NAKATA, R. and OSADA, Y. (2009), Perception of neon-color spreading in squirrel monkeys. Japanese Psychological Research, 51: 132–145. doi: 10.1111/j.1468-5884.2009.00405.x
Part of the research was supported by the “Open Research Centre” Project for Private Universities: Matching fund subsidy from MEXT (Ministry of Education, Culture, Sports, Science and Technology), 2005–2009.
- Issue published online: 16 SEP 2009
- Article first published online: 16 SEP 2009
- (Received January 28, 2009; accepted May 16, 2009)
- squirrel monkeys;
- neon-color spreading;
- visual illusion
In three experiments, we explored the perception of neon-color spreading in squirrel monkeys and compared it with that of humans. In Experiment 1, human observers were tested to confirm the effect of stimulus aspects that were controlled in a series of experiments on the neon-color effect. The strength of the neon-color effect was modulated by the width, spacing, and luminance ratio of crosshatched lines that induced neon-color spreading. In Experiment 2A, one squirrel monkey was taught to discriminate a circle from three other shapes induced by the neon-color effect under the same stimulus conditions as in Experiment 1. The dependent measure was the percentage of correct responses. In Experiment 2B, two monkeys were trained to discriminate a target stimulus from three nontarget stimuli that were neon-color effect versions of the target stimulus. The dependent measure was the error rate that monkeys committed in their task of discrimination. The results in Experiments 2A and 2B were comparable with the results in Experiment 1, which suggests that squirrel monkeys perceive neon-color spreading.