Navigation Links
Monkeys can point to objects they do not report seeing
Date:11/19/2013

Are monkeys, like humans, able to ascertain where objects are located without much more than a sideways glance? Quite likely, says Lau Andersen of the Aarhus University in Denmark, lead author of a study conducted at the Yerkes National Primate Research Center of Emory University, published in Springer's journal Animal Cognition. The study finds that monkeys are able to localize stimuli they do not perceive.

Humans are able to locate, and even side-step, objects in their peripheral vision, sometimes before they perceive the object even being present. Andersen and colleagues therefore wanted to find out if visually guided action and visual perception also occurred independently in other primates.

The researchers trained five adult male rhesus monkeys (Macaca mulatta) to perform a short-latency, highly stereotyped localization task. Using a touchscreen computer, the animals learned to touch one of four locations where an object was briefly presented. The monkeys also learned to perform a detection task using identical stimuli, in which they had to report the presence or absence of an object by pressing one of two buttons. These techniques are similar to those used to test normal humans, and therefore make an especially direct comparison between humans and monkeys possible. A method called "visual masking" was used to systematically reduce how easily a visual target was processed.

Andersen and his colleagues found that the monkeys were still able to locate targets that they could not detect. The animals performed the tasks very accurately when the stimuli were unmasked, and their performance dropped when visual masking was employed. But monkeys could still locate targets at masking levels for which they reported that no target had been presented. While these results cannot establish the existence of phenomenal vision in monkeys, the discrepancy between visually guided action and detection parallels the dissociation of conscious and unconscious vision seen in humans.

"Knowing whether similar independent brain systems are present in humans and nonverbal species is critical to our understanding of comparative psychology and the evolution of brains," explains Andersen.


'/>"/>

Contact: Alexander Brown
alexander.brown@springer.com
212-620-8063
Springer Science+Business Media
Source:Eurekalert

Related biology news :

1. Do monkeys know what others need?
2. The old primates club: Even male monkeys ride their fathers coattails to success
3. Monkeys put off sex by bystanders
4. Estrogenic plants linked to altered hormones, possible behavior changes in monkeys
5. Monkey business: What howler monkeys can tell us about the role of interbreeding in human evolution
6. Networking ability a family trait in monkeys
7. Monkeys stressed from longer foraging times
8. Monkeys understand rules underlying language musicality
9. Biologists find an evolutionary Facebook for monkeys and apes
10. Penn research points to new way of preserving fertility for boys undergoing cancer treatment
11. Newly discovered foot points to a new kid on the hominin block
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/7/2019)... , ... January 07, 2019 , ... ... and Artificial Intelligence solutions for precision health in oncology and other key therapeutic ... Morgan’s exclusive meeting of investors, entrepreneurs and executives spanning the entire healthcare landscape, ...
(Date:1/4/2019)... ... January 02, 2019 , ... ... noteworthy, as the life science tools and service supplier turned 40 in 2018 ... catalog. The catalog features not just part numbers like most catalogs, but rather, ...
(Date:12/27/2018)... ... December 27, 2018 , ... AxioMed ... its new Boston facility, and is now raising growth capital to ramp up ... market share against inferior ball and socket discs. The capital raise is targeted ...
Breaking Biology News(10 mins):
(Date:12/5/2018)... ... December 05, 2018 , ... STRmix™ – sophisticated forensic ... interpret – has been used to convict a Wyoming man of third-degree sexual assault, ... Laboratory used STRmix™ to test for DNA on the couch cushions on which the ...
(Date:11/29/2018)... , ... November 29, 2018 , ... RAGS, today announced ... by Kickstart Seed Fund, with participation from existing investor and board member Jeremy Andrus, ... Smith of Cotopaxi. The additional funding will enable the company to accelerate its growth ...
(Date:11/27/2018)... SANDY SPRINGS, Ga. (PRWEB) , ... November 27, 2018 , ... ... GA, can now visit Dr. Dan Myers’ practice for treatment, with or without a ... of cosmetic procedures and tools, including porcelain veneers, dental implants, bridges and custom crowns. ...
(Date:11/20/2018)... (PRWEB) , ... November 19, 2018 , ... ... pleased to announce the release of the Chinese translation of Best Practices: Recommendations ... 2018, is a practice-changing publication aimed at advancing the science of biobanking to ...
Breaking Biology Technology: