From ScienceDaily:
The elephantnose fish explores objects in its surroundings by using its eyes or its electrical sense — sometimes both together. Zoologists have now found out how complex the processing of these sensory impressions is. With its tiny brain, the fish achieves performance comparable to that of humans or mammals. More. Paper. (paywall) – Sarah Schumacher, Theresa Burt de Perera, Johanna Thenert, Gerhard von der Emde. Cross-modal object recognition and dynamic weighting of sensory inputs in a fish. Proceedings of the National Academy of Sciences, 2016; 201603120 DOI: 10.1073/pnas.1603120113
See also: What can we hope to learn about animal minds?
Are apes entering the Stone Age?
Furry, feathery, and finny animals speak their minds
Does intelligence depend on a specific type of brain?
Animal minds: In search of the minimal self
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