1.3 Procesamiento basado en una región de la imagen
1.3.4 Segmentación de imágenes
Different forms of information, communication and education have been largely used in the prevention of drug use and, in minor scale, in the prevention of drug-‐related harms (e.g. overdose). Messages are usually conveyed by leaflets, posters, advocacy events and social marketing campaigns, and are normally integrated in broader interventions (e.g. mass media campaigns, harm reduction and treatment interventions, etc.).
The literature dedicated to the assessment of the efficacy of this kind of interventions is scarce, as well as evidences that can support these measures’ effectiveness, despite some suggestions that in some cases, they can have a short-‐term effect in raising awareness and changing the way these phenomena are understood (but not in changing behaviours; Trimbos Institute, 2006). In order to enhance these approaches’ effectiveness, it is currently accepted that they need to be inserted in more comprehensive prevention or harm reduction packages (Aggleton, Jenkins & Malcolm, 2005). Also, they have to contain messages and use strategies tailored to the needs of specific target groups (ibidem). A good example of this comes from the Public Health Agencies of Catalonia and Barcelona, with the creation of an overdose-‐ awareness video to be broadcasted in the waiting rooms of drug facilities (available in several
languages at: http://vimeo.com/album/1655129).
Among the channels used to convey information on the drug consumption topic, it is relatively common to find the use of mass media campaigns, normally provided by public bodies. They range from the isolated use of one campaign to the integration on complex social marketing programs. The major potential of mass media campaigns is associated to their ability to express messages to large audiences with a low cost per capita. However, the use of these media resources faces several challenges until achieving the goal of changing health-‐related behaviours: messages can be counterproductive and their homogeneous nature can fail to achieve heterogeneous groups of interest; they could get “asphyxiated” by the increasing fractured media environment; there could be inappropriate or poorly evidence-‐based formats and contents, and sometimes they focus on behaviours that are hardly addressed by the target groups (Wakefield, Loken, & Hornik, 2010).
Currently, there is a debate and controversy surrounding the effectiveness and cost-‐ effectiveness of recurring to mass media strategies for addressing health behaviours, in particular (risky) drug use behaviours (Ferri, Allara, Bo, Gasparrini & Faggiano, 2013). Usually, if we consider the target groups (and not the cost per capita) mass media campaigns are expensive universal prevention strategies and the scarce studies dedicated to assess their effectiveness are not conclusive or don’t support their positive impact (Ferri et al., 2013; Trimbos Institute, 2006; Hornik et al., 2003). In addition, there are methodological challenges in the study of this topic, being difficult to isolate the effect of mass media campaigns. In the European context, there is no systematic assessment about the impact of mass media campaigns in behaviour associated with drug use and harms. Also, few of those have been formally evaluated, and in the ones that were (e.g. campaigns from Bulgaria, Denmark, France, Netherlands, Sweden, United Kingdom) only data concerning understanding, empathy and retention of the message conveyed was analysed (Ferri et al., 2013). In the specific case of overdose prevention campaigns, inconclusive or discouraging results regarding the efficacy of mass media campaigns are mirrored in the scarce literature on the topic (e.g. UK “Lifeguard” social marketing campaign, Roberts & McVeigh, 2004; Canadian “It’s more about the heroin” warning campaign, Kerr, Small, Hyshka, Maher & Shannon, 2013). This way, solid conclusions about the effects of media campaigns on preventing overdose are not currently possible. However, if included in intervention packages, information and communication strategies can enhance the results achieved by those, especially if they are targeted and have some sort of meaning to the population they’re trying to reach. The likelihood of improving media campaigns’ success increases according to the availability of multiple interventions (e.g. overdose videos in outreach teams mobile units); the access to key services (where the promotion of these services is done by the media; e.g. overdose prevention training); and the creation of policies that support the change in behaviours (e.g. dichotomy between the promotion of treatment as protective factor for overdose and impose strict rules of access) (Wakefield et al., 2010). Messages promoting overdose prevention must be regular and targeted, aiming to raise awareness about risk and protective factors. They should focus on the “main areas of risk; be time-‐limited and change regularly; only attempt to address one priority issue at a time, rather than having many issues competing for attention” (National Treatment Agency, 2004, p. 14). To those characteristics, we add another fundamental one: the meaningfulness and proximity of messages conveyed. Also, media messages that aren’t paternalistic and invite people to make choices according to their own insights have proven to be more effective (Trimbos Institute, 2006). An example of these initiatives is the “I am the Evidence” Campaign, developed by the Eurasian Harm Reduction Network (EHRN) and
supported by the European People Using Drugs (EuroPUD). In the scope of the Euro HRNII project, this initiative implemented an advocacy campaign in 6 EU states, based on the collection and promotion of video testimonials about personal experiences with naloxone.
According to this information, we can conclude that “mass media messages can set an agenda for and increase the frequency, depth, or both, of interpersonal discussion about a particular health issue” (Wakefield et al., 2010, p. 1262), but they are largely ineffective if not combined with a proximal intervention. Also, it is vital to carefully plan and test the campaign content and format according to the assessment of the needs and resources of the target groups.
Additional challenges surrounding mass media are associated with their power to greatly influence the public opinion. The nature of the messages routinely conveyed by them on the topic of drug consumption and overdoses is certainly not ignored by the communities or by the politicians. The media are one of the main sources of information regarding issues that aren’t part of the publics’ direct experiences, which is especially relevant when the theme mentioned is highly sensitive -‐ drug use and drug deaths; the probability of generating messages marked by stigma is high. A survey developed by IPSOS-‐MORI (2007) (UK) shows that the individuals who report knowing something about illicit drugs, got their information from the media (DrugScope, 2011). When depreciating messages and prejudice regarding drug user(s) and drug deaths are spread by media, PUD and their families face devastating effects (e.g. stigma can prevent their access to treatment; it can invalidate the grieve processes in cases of drug-‐ related deaths; DrugScope, 2011). Myths or inaccurate information about drug-‐induced deaths in media, with potential impact to PUD, are found in the scarce literature on this topic. A study developed in the UK shows that drug-‐induced deaths tend to be more extensively reported in the media when ecstasy is involved (when compared with other substances), in spite of the fact that the annual level of mortality associated with this substance is very low (UKDPC, 2010). This is an example of a message that is inaccurately conveyed, thus presenting the idea that people who consume ecstasy are the ones at most risk of an overdose. According to this scenario, some recent European initiatives invested in gathering evidences about the stigma conveyed by mass media, as well as in the production of guidelines for journalists, in order to tackle the myths present in drug-‐associated stories. Some examples we’d like to highlight are the work of the UK Drug Policy Commission – “Dealing with the stigma of drugs: A guide for journalists” (UKDPC, 2012) and the one of Drug Scope (2011) – “The media guide to drugs: Key facts and figures for journalists”. Although the current indicators show that mass media tend to fuel public indifference towards drug users, convey misinformation about risks associated
with drug use (e.g. drug-‐related deaths), and also contribute to the distinction between “good” and “bad” drugs, some positive influence by the projects aforementioned is already beginning to be noticeable. Also, some encouraging results concerning public awareness were revealed by a British study: over 60% of national participants consider that people with drug problems were often stigmatised by the press (UKDPC, 2010).