As part of a cool project in blogging on Google+ ("plogging"), Nature editor Noah Gray writes about a recent experiment that found that specific neurons in the human amygdala respond instantly to images of animals. These responses were stronger and faster than when other neurons responded to those images, and stronger and faster than when the animal-centric neurons responded to other types of images.
The amygdala is well known to be involved in fear modulation and memory, as well as influencing other types of emotional processing. So is it expected that cells in this structure would respond so strongly to the sight of animals? There is a moderate precedent from the non-human primate literature. Studies in macaques have revealed strong firing of amygdalar neurons to faces, so categorical responses aren't unique in the amygdala. This is true in humans as well, but humans also maintain a different dedicated brain region for face processing, perhaps opening up some portions of the amygdala to take on additional, different roles. But why would we need a dedicated system for animal imagery, elevating this particular stimulus to such an important position in our recognition system? Well this is all speculation, but it isn't difficult to state the obvious and stress that animals were critical as prey for our ancient ancestors, as well as potential threats. Thus, early man may have developed a system to speed our reaction times to such an important category as the landscape was visually scanned for information. Placing this system in a brain region critical to emotion processing could have also more-easily mobilized action through a rapid activation of attack or flight responses.
Image: Animal Kingdom Sign, a Creative Commons Attribution Share-Alike (2.0) image from pixeljones's photostream
I’ve heard — and repeated — the theory that addiction rates among indigenous people in the Americas was caused by genetics — specifically, that “new world” populations hadn’t gone through the European plague years’ genetic bottleneck that killed everyone who couldn’t survive on alcoholic beverages (these having been boiled during their production and thus less […]
The PocketLab is billed as a “Swiss Army Knife of science.” Launched via Kickstarter, the small device contains numerous sensors to measure acceleration, force, angular velocity, magnetic field, pressure, altitude, and temperature and send that data to smartphones or laptops. According to inventor Clifton Roozeboom, it’s a tool for students and citizen scientists who can’t […]
In the 2015 Sense About Science lecture (MP3), Tracey Brown discusses the worst casualty of politicization of science, from fluoride to climate change — the truth.
The Lytro Illum dares to be different, boasting even more robust features than its first generation predecessor and a sleek design reminiscent of professional DSLRs. What’s so cool about it? Most cameras capture the position of light rays, producing a statoc 2D image.
SitePoint Premium is the ultimate e-learning library for web developers, designers, and digital professionals. Famous for their web development books written by industry leaders, they’ve expanded their content library to include in-depth video courses and short, handy screencasts partnering with A Book Apart and UX Mastery. Whatever you want to achieve in your web career, […]
Skip the technical jargon and get right to taking amazing, professional-quality photos with this complete training. The Hollywood Art Institute Photography Course includes 22 modules filled with tutorials on how to profit off of your photography, or simply capture your memories in the manner they deserve.Accredited by the Photography Education Accreditation CouncilDive into this 22 […]