Dogs Remember More Than You Think
A new study shows dogs display episodic memory supporting what many already knew
Posted Nov 24, 2016
Dogs remember much more than you think they do
Dogs are "in." Hardly a week goes by that a research paper and numerous popular accounts don't appear in the news. This week is no different. First, on the "down" side, we've learned that researchers in some laboratories in the United States often secretively do whatever they want to dogs "in the name of science" in "wasteful, bizarre and deadly experiments" with little to no transparency. Basically, they get away with murder, using taxpayer's money, and no one does anything about it.
On the "up" side of things, I was so pleased to learn about a study by Claudia Fugazza, Ákos Pogány, and Ádám Miklósi, who work in the Department of Ethology at Eötvös Loránd University in Budapest, Hungary, that was just published in Current Biology. This new and very significant essay is titled, "Recall of Others’ Actions after Incidental Encoding Reveals Episodic-like Memory in Dogs." Needless to say, this study received broad global coverage in mass media. People really do want to know what dogs know. And, here is a video of how the research was conducted.
Their summary of the important research essay that's available online reads:
The existence of episodic memory in non-human animals is a debated topic that has been investigated using different methodologies that reflect diverse theoretical approaches to its definition. A fundamental feature of episodic memory is recalling after incidental encoding, which can be assessed if the recall test is unexpected . We used a modified version of the “Do as I Do” method , relying on dogs’ ability to imitate human actions, to test whether dogs can rely on episodic memory when recalling others’ actions from the past. Dogs were first trained to imitate human actions on command. Next, they were trained to perform a simple training exercise (lying down), irrespective of the previously demonstrated action. This way, we substituted their expectation to be required to imitate with the expectation to be required to lie down. We then tested whether dogs recalled the demonstrated actions by unexpectedly giving them the command to imitate, instead of lying down. Dogs were tested with a short (1 min) and a long (1 hr) retention interval. They were able to recall the demonstrated actions after both intervals; however, their performance declined more with time compared to conditions in which imitation was expected. These findings show that dogs recall past events as complex as human actions even if they do not expect the memory test, providing evidence for episodic-like memory. Dogs offer an ideal model to study episodic memory in non-human species, and this methodological approach allows investigating memory of complex, context-rich events.
Didn't we already know dogs had great memories?: A brief interview with Dr. Ádám Miklósi
Many animals spend a lot of time resting, often peering around at their surroundings and taking in the sights, sounds, and smells. Dogs surely do this. I often smiled as I watched the dogs with whom I shared my home just hanging out and looking around at their dog and human friends and their environs. When I've done field work on a number of different animals, I also noted that they spent a lot of time just hanging out and looking around as they rested. I was convinced that they were picking up a lot of information from just looking around, and that what they learned they could use in their social encounters with others.
In response to this new study I received a number of emails asking something like, "Didn't we already know that dogs had great memories?" Yes, we did, and a good deal of "citizen science" shows this to be so. But, I wanted to know more, so I sent dog expert Dr. Ádám Miklósi, founder of the Family dog Project who was involved in the study, two questions to which he responded immediately. They were, "Why did you do this study?" and "How does it extend what we know from (i) other formal studies and (ii) what people know from watching their dog at home or at a dog park?"
Dr. Miklósi answered the first question quite easily: "Claudia [lead author of the study, Claudia Fugazza] went to a conference on memory, and then she suggested that maybe the 'Do as I Do' method offers a way to provide some evidence for this."
Dr. Miklósi's answer to the second question, "How does it extend what we know from (i) other formal studies and (ii) what people know from watching their dog at home or at a dog park?" was: "As usual this is something that dog people may have assumed the dog is capable of doing. But most of them did not think about the possibility that dogs remember specific events happening around them. This study shows now that dogs (and probably many other animals) are able to do this. So they not only remember (spontaneously) what they have done (there are studies on chimps, rats, dolphins along this lines), but also what their owner did. For example, they may watch the owner cut the roses in the garden one day, and then when they see those flowers again, this memory could pop up in their mind. This could happen without showing any change in behavior, because this is just a spontaneous 'thought,' although in some other cases such thoughts may actually become causes of (spontaneous) behaviour."
In one interview I did about this study, I noted, "Dogs have great memories of a lot of events and this study shows that we’re still learning just how good their memory really is ... Dogs need to be able to learn and remember what their human wants them to do, and there won’t always be an immediate association of the events in time ... So, it is not surprising to me that dogs can remember the ‘Do it’ request after a period of time even if they weren’t expecting to be asked to do something.”
A few of the dogs with whom I lived acted like "know-it-alls": Dogs remember yesterday and much more
This new research reminded me that many of the dogs with whom I lived acted like "know-it-alls." They seemed to have a sense of knowing what I was going to do or what I wanted them to do, although I'd never explicitly taught them to make these associations. I felt the same about some of the wild coyotes I studied for years. They just seemed to know what others were thinking, feeling, and wanted them to do. I'm sure the dogs and coyotes (and many other animals) had some sort of "theory of mind." (See "Theory of Mind and Play: Ape Exceptionalism Is Too Narrow.")
As I read through this new research paper I remembered an essay I wrote last year called "Dogs Don't Remember Yesterday, Claims Psychologist," about the seemingly ludicrous claim that "dogs don't remember what happened yesterday and don't plan for tomorrow." The author claimed that dogs are stuck in an "eternal present."
In my essay I wrote, "There are many examples of dogs and other animals 'remembering yesterday.' Think of dogs and other animals who have been severely abused and who suffer from severe fear or depression for years on end, and also, for example, think of dogs who remember where they and others peed and pooped, dogs who remember where their friends and foes live, dogs who change their behavior based on what they learned in various sorts of learning experiments, and dogs who remember where they're fed and where they've cached food and other objects. The list goes on and on."
I also wrote, "From an evolutionary point of view it would be somewhat odd and exceptional if mammals such as dogs and many other animals didn't remember yesterday and plan accordingly." Along these lines, the authors of the present study write, "This is the first evidence of episodic-like memory of others’ actions in a non-human species, and it is the first report of this type of memory in dogs. We suggest that dogs might provide a new non-human animal model to study the complexity of incidental encoding of context-rich events, especially because of their evolutionary and developmental advantage to live in human social groups."
This is a very exciting time for the comparative study of animal minds
I'm very pleased to share the results of the present study with you. Yes, many of us already "knew" from "citizen science" that dogs often know more than we give them credit for, but it's also nice to know that science backs us up. I've learned an incredible amount from people writing to me and talking with me about their dogs, and I've often noted that when the serious science is done, results rarely conflict with what many others already knew.
This is a very exciting time for the comparative study of animal minds, a branch of science called cognitive ethology. Please stay tuned for more on the fascinating and "surprising" cognitive lives of dogs and other animals.
Marc Bekoff’s latest books are Jasper’s Story: Saving Moon Bears (with Jill Robinson), Ignoring Nature No More: The Case for Compassionate Conservation, Why Dogs Hump and Bees Get Depressed: The Fascinating Science of Animal Intelligence, Emotions, Friendship, and Conservation, Rewilding Our Hearts: Building Pathways of Compassion and Coexistence, and The Jane Effect: Celebrating Jane Goodall (edited with Dale Peterson). The Animals’ Agenda: Freedom, Compassion, and Coexistence in the Human Age (with Jessica Pierce) will be published in early 2017.