Long-term memory of color stimuli in the jungle crow (Corvus macrorhynchos)

• Published in: Animal cognition Vol. 15; no. 2; pp. 285 - 291
• Main Authors: Bogale, Bezawork Afework, Sugawara, Satoshi, Sakano, Katsuhisa, Tsuda, Sonoko, Sugita, Shoei
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.03.2012; Springer Nature B.V
• Subjects: Animal cognition; Animals; Behavioral Sciences; Biomedical and Life Sciences; Birds; Color; Color Perception; Crows; Discrimination (Psychology); Discrimination Learning; Life Sciences; Memory; Memory, Long-Term; Photic Stimulation; Psychology Research; Short Communication; Zoology; Discrimination learning; ); Long-term memory; Jungle crow; Color stimuli
• ISSN: 1435-9448; 1435-9456
• DOI: 10.1007/s10071-011-0439-9

Wild-caught jungle crows ( n  = 20) were trained to discriminate between color stimuli in a two-alternative discrimination task. Next, crows were tested for long-term memory after 1-, 2-, 3-, 6-, and 10-month retention intervals. This preliminary study showed that jungle crows learn the task and reach a discrimination criterion (80% or more correct choices in two consecutive sessions of ten trials) in a few trials, and some even in a single session. Most, if not all, crows successfully remembered the constantly reinforced visual stimulus during training after all retention intervals. These results suggest that jungle crows have a high retention capacity for learned information, at least after a 10-month retention interval and make no or very few errors. This study is the first to show long-term memory capacity of color stimuli in corvids following a brief training that memory rather than rehearsal was apparent. Memory of visual color information is vital for exploitation of biological resources in crows. We suspect that jungle crows could remember the learned color discrimination task even after a much longer retention interval.