Has any research been conducted about how shoppers shop at shelf?
Our retailer has suggested that they have seen evidence that customers shop from the top shelf to bottom shelf – I am looking for evidence that either supports this or suggests otherwise.
While there is knowledge related to visual search, there is very little replicated, published research regarding search at supermarket shelves (Kasneci, 2014). Visual search is not a definite flowchart type process. It relies on neurons and neural networks, which operate on probabilities, not definites (Eckstein, 2011).
One thing to keep in mind when considering this type of research is that the time spent at shelf is so so short that the order in which people see thing on shelf are unlikely to be meaningful.
Report 67: Shopping Takes Only Seconds…in-store and online
People are only buying a few items, and most of these they have bought before, so an active “search” process is a very rare behaviour.
Report 64: The Fundamentals of Shopper Behaviour
That means when we’re talking about “search”, we’re really looking at “search of visual fields”. One way of thinking about it is that if you’re looking for your partner at the airport, if you had the most powerful computer in the world that could see everywhere at once, you could find them instantaneously. But, we have brains and eyes that need to search the visual field to find them. How they do that is the subject of a huge amount of research, as we still don’t have a single answer like “from the top down,” because that’s not how eyes or brains work.
Preattentive processing (Kristjánsson & Egeth, 2020; Treisman & Gelade, 1980) is the idea that before even attending to a scene, our eyes and brains use a range of strategies (see below) to determine where to focus first. These vary in the number of layers of processing from triadic models (Rensink, 2000), to computational salience models eg (Tsotsos, 2011).
There are more directed models of processing, e.g., the Target Acquisition Model (Zelinsky, 2008), but these usually involve some parallel processing similar to the pre-attentive processing models.
Guided search (Wolfe et al., 2015) is where people look for something and already have some idea of what they are looking for, e.g., looking for the green pack. However, people probably can’t tell you what exactly it was that they were using to help them find what they were looking for. In a marketing context, we would say that Distinctive Assets are those things!
There are at least five factors that guide attention during visual search: bottom-up salience, top-down feature guidance, scene guidance, history, and value (Wolfe & Horowitz, 2017). Bottom-up salience is where your eyes themselves direct attention to visual features that might be important. This is processing in the eye, rather than the cortex. This means features like centre-surrounds (think of the Target logo) attract the most attention. Top-down feature guidance is where your conscious brain directs attention. Scene guidance is knowing that a toaster is more likely to be found on a bench than on the floor, or that a big bag of rice will be on a lower shelf. History is knowing where an object was last time, i.e., don’t move shelves around unnecessarily, or what the object looked like last time. And value is how important the object is to them – which is going to vary tremendously, but still not be very high, and so if shoppers can’t find an object, then they are likely to give up well within the 20 seconds maximum they spend at shelf.
Bottom-up guidance
People are more likely to see and find objects closer to the centre of their field of vision (Tatler, 2007, 2011). This does mean that you shouldn’t be on the very top or very bottom shelves. And, given that people are of varying heights, there is no perfect height for your product to be at.
If the search task is easy, then peripheral vision is enough to find a pack, without needing to fixate (Eckstein, 2011). Fixations on a pack at shelf aren’t needed to find it either (due to preattentive processing) – so if research is using fixations to determine “findability” then it’s not necessarily measuring the right thing. Your job should be to make sure that your pack comes up looking bad on eye-tracking because people don’t need to fixate on it to find it!
History
Pre-exisiting mental structures guide search: people aren’t coming to the shelf for the first time, but have some idea of what they’re looking for. Their history will shape the search strategy they use to find the product (Wolfe, 2020). People are faster at finding things they have found before. This applies to simple objects, in a clinical setting, where the colour of the object they found in one trial influences how fast they find the next object of the same colour (Theeuwes, 2018), but will also apply to products on shelf. Changing the packaging will disrupt this, and slow search.
Most important is that you give shoppers a known target to search for: that is, you don’t change the pack without a very, very good reason. People who buy the brand less than once a year make up 40% of the brand’s sales
Report 73: Ultra-lights – The Unbearable Lightness of Buying,
and if they are looking for the pack they bought last time, and it has been changed, then you may as well not be on the shelf.
Scene guidance
People look for objects in the place they last saw them (Walthew & Gilchrist, 2006; Maljkovic & Nakayama, 1996), so if a product that used to be at the bottom of the shelf moves to the top, they will look at the bottom shelf first.
Or, people can use knowledge of what other brands are usually near the brand they are looking for to find things more easily (e.g., search times: Posner, Snyder, & Davidson, 1980; accuracy: Luck et al., 1994; Palmer, Ames, & Lindsey, 1993; Smith & Ratcliff, 2009).
Value
The importance of the search task will shape the search strategies people use – if the reward for getting it right is higher, then they will be more likely to spend more effort and energy searching before giving up (Van Wert, Horowitz, & Wolfe, 2009; Rich et al., 2008, Failing & Theeuwes, 2017). The more often people are rewarded for finding an object, the faster and better they are at it (Navalpakkam, Koch, Rangel, & Perona, 2010) – in the context of shopping, that means the better your product is, and the more often people buy it, the faster they will be able to find it. (Eckstein, Schoonveld, & Zhang, 2010).
This article is well-written and relatively easy to read:
Visual Search: How Do We Find What We Are Looking For?.
It also has some great content about the search templates that people use, which are more about “don’t change your pack unnecessarily” in section 4.
This is a deeper look that includes more about the specific neural pathways and processing that occurs: Visual search: A retrospective
You can see from even a cursory reading of these articles that “people shop from the top down” is misleading at best, and more likely completely wrong.
B.P.
14 May 2024
Link: https://sponsors.marketingscience.info/frequently-asked-questions/how-do-shoppers-shop-at-shelf/
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