article_snippet.sent: Subjects were shown an on-screen ‘texture’ of either visual or horizontal lines and had to quickly point out - in a fraction of a second - the one area where an anomalous texture appeared.
article_snippet.sent: In visual processing research this is a standard protocol called a ‘texture discrimination task.
article_snippet.sent: Research subjects were shown an on-screen texture of short lines - either vertical or horizontal, first one then the other - and were asked to spot anomalies.