Showing posts with label PET. Show all posts
Showing posts with label PET. Show all posts

Wednesday, August 07, 2013

Neuromarketing research for the win - pt2

The main question is: Should Neuromarketing research be closer to quantitative or qualitative approach?


Qualitative research is an in-depth exploration of what triggers people on a particular subject: their feelings, perceptions, decision-making processes, and so on. The most common forms of qualitative research are focus groups and depth interviews. Qualitative research will provide a much deeper understanding of how the target market thinks, but it does not provide data that can be projected and derived, so results cannot be generalized. 

On the other hand,  quantitative research  can be generalized, as it employs a larger sample (through mail, telephone or internet) which is representative of the entire population being researched, but it won't provide the depth of information available through qualitative research. 
Each approach has its drawbacks, as quantitative research often forces responses or people into categories that might not fit them, and qualitative research, on the other hand, sometimes focuses too closely on individual results and fails to make connections to larger situations or possible causes of  the results. But the solution would come in finding the most effective way to incorporate elements of both to ensure that their studies are accurate and valid[Bercea, 2013].

Neuromarketing and quantitative research

With regards to neuromarketing and quantitative research, there are some common points that are highlighted below: 


●  Psychophysiological techniques from neuromarketing research use a number of indicators to keep track of different psychological responses to stimuli, responses that can be represented by cognitive and affective processes. Quantitative measures of the cognitive processes include measures of beliefs, knowledge, attitudes, attention, memory, recall and everything that happens in the subject's mind. On the other hand, the affective process is a mental state that develops spontaneously without cognitive effort, and is involved with a set of emotional reactions.  



●  Rapid technological evolution enables marketing researchers to use more advanced equipment to conduct psychophysiological measurements. Researchers usually have to visually examine brain wave patterns recorded by EEG and also conduct brain wave mapping and statistical analyses using specific algorithms and software. Using computer-aided EEG, future marketing research may aim to identify the relationships between psychological processes and certain patterns of brain waves.  

●  Most data analysis in neuromarketing research includes preprocessing, statistical analysis, data interpretation (behavioral analysis and neuroimaging data analysis) and triangulation. Preprocessing includes having different phases which perform time correction (between appearance of stimuli and recording the signal of its effect), head motion correction, normalization (using algorithms in order to obtain a standard brain template) and smoothing (removing noises using Gaussian filters). Statistical analysis on the level of brain regions in order to find the Voxels (coordinates) for which the time series (fitting a general linear model) significantly correlates with a specific experimental condition. Data interpretation should confirm or infirm the hypothesis of the research, and triangulation should validate the research by correcting complementary sources and linking them to the data acquired with neuroimaging. 

● The purpose of neuromarketing studies is to test hypothesis, look at cause and effect and make predictions concerning consumer behavior, developing a quantitative approach.


● Although using a small sample size, findings can be generalized, as brain mechanisms of people are similar.




Neuromarketing and qualitative Research


Neuromarketing research passes the boundaries of traditional marketing research methods through the information provided and with the great advantage that it requires only 10% of subjects that would be necessary for traditional methods. Also, neuromarketing studies are small sample sized (not randomly selected) due to costs and complexity of the experiments, but taking into consideration that the data collected also contains noises that must be removed, at least 15 to 20 participants should be recruited to such studies in order to obtain internal validity. The reasearch of a small amount of subjects used make neuromarketing  come closer to the qualitative side and stay further from the quantitative one.


Invasive methods (such as PET or TMS - described in the previous post) change the role of the researcher, as he is able to activate or temporary disable areas of the brain or to add radioactive chemicals in the subject's blood.




Thus, we can consider neuromarketing research as being 

a triangulation of research, as it implies defining a problem (qualitative approach), 
defining and test hypothesis (quantitative approach) and exploring the results in depth (qualitative approach) [tribute to Monica Bercea, PhD, 2013] .



A sample Anti-smoking ad : Neuromarketing and UCLA fMRI 


Ad Campaign Comparison
www.neurosciencemarketing.com

A study published in Psychological Science brings us closer to that point: scientists using a UCLA fMRI facility analyzed anti-smoking ads by recording subject brain activity. They also asked subjects about the commercials and whether the ads were likely to change their behavior. The researchers found that activity in one specific area of the brain predicted the effectiveness of the ads in the larger population, while the self-reports didn’t.



The methodology involved comparing brain activity in subjects who viewed ads from three campaigns to actual performance of the campaigns in increasing call volumes. The researchers focused on a subregion of the medial prefrontal cortex (MPFC) but also compared activity in other brain regions for control purposes. They found that the ad campaign which created the greatest activity in the MPFC region generated significantly more calls to a stop-smoking hotline. The subjects failed to identify which ads would change their behavior; in fact, the most effective campaign, “C,” was the one judged to be least likely to work. The researchers also asked a group of industry experts to predict which campaign would work best. Like the experimental subjects, the so-called experts also predicted that “C” would be the least effective [Roger Dooley,2012] .

Even if this single, small study of smoker behavior can’t be readily extrapolated to campaigns for BMW or Pepsi, it’s still of great significance in proving neuromarketing studies can actually work. As the authors note, “The approach described here is novel because it directly links neural responses with behavioral responses to the ads at the population level.” Simply put, the brain scan data correctly predicted how the ads would perform in the real world – not just how the subjects would behave, but the broader public audience. Well, that’s a major milestone.



Thursday, July 25, 2013

Neuromarketing research for the win - pt1

Marketing research methods continuously develop and over the last decade technology offered solutions to improve this area. Traditional marketing research methods fail at some point in certain cases, and since emotions are mediators of how consumers process marketing messages, understanding of cognitive responses to advertisements have always been a challenge in methodology. Neuromarketing is the branch of neuroscience research that aims to better understand the consumer through his unconscious processes and has application in marketing, explaining consumer's preferences, motivations and expectations, predicting his behavior and evaluating successes or failures of advertising messages.

Neuroscience


Neuroscience gathers information on the structure and functions of the brain and its sub-domain called cognitive neuroscience seeks to understand the neural mechanisms behind thoughts, reasoning, emotions, memory or decision making. Using technology advances in neuroscience, researchers can obtain information on brain responses to marketing stimuli, not having full confidence in what they report. They provide new ways for understanding how consumers store, retrieve, develop and use information. Neuromarketing is an emerging interdisciplinary field that aims to investigate and understand consumer behavior by studying the brain. Thus, using neuroimaging techniques, researchers measure subjects' responses to marketing stimuli. Therefore, the development of this field depends on the advance of science, technology and computer science.



Neuroimaging tools


Functional Magnetic Resonance Imaging (fMRI) represents an appropriate methodology for uncovering the areas of the brain activation in response to a very simple experimental design with little potential for the temporal dimension to be a problem. fMRI combines magnetic field and radio waves, producing a signal that allows viewing brain structures in detail and following the metabolic activity in the brain. Τhe subject lies on a bed, with the head surrounded by a large magnet which causes the atom particles (protons) inside the subject's head to align with the magnetic field. As blood contains iron, the iron atoms that are not bound to oxygen produce small distortions in the nearer magnetic field and when a certain brain area is active, corresponding blood vessels dilate and more blood rushes in, reducing the amount of oxygen-fee hemoglobin and producing a change in the magnetic field in the active area.




Software allows viewing this change, displaying colored areas overlapping the grey-scale image of the brain and refreshing the image every 2 to 5 seconds. fMRI allows measuring brain activity and searching for patterns while subjects perform certain tasks or experience marketing stimuli. Data analysis can be conducted using specific software packages, as BrainVoyager QX or Statistical parametric Mapping (SPM5).

Electroencephalography (EEG) is one of the most used tools in neuromarketing research, after fMRI. The amplitudes of the recorded brain waves correspond to certain mental states, such as wakefulness (beta waves), relaxation (alpha waves), calmness (theta waves) and sleep (delta waves). A number of electrodes (up to 256) are placed on the scalp of the subjects, in certain areas, in order to measure and record the electricity for that certain spot. Technology allows EEG to be a portable device and record brain activity in any many circumstances, as for example in supermarkets. Also, EEG is able to record only activity data from superficial layers of the cortex.

Positron emission tomography (PET) is another expensive method to use that can obtain physiologic images with spatial resolution similar to fMRI by recording the radiation from the emission of positrons from the radioactive substance administered to the subject. A battery of detectors surrounds the subject's head and traces radiation pulse, without precisely identify the location of the signal. Technical issues involve obtaining the radioactive material and it's short life.

Transcranial magnetic stimulation (TMS) uses magnetic induction in order to modulate the activity of certain brain areas that are located 1-2 centimeters inside, without reaching the neocortex. New TMS technology allows also targeting lower brain areas and is less expensive than PET or fMRI scanners. A plastic case containing an electric coil is positioned near to the subject's head. TMS discharges a magnetic field that passes through the brain, allowing making changes in the brain tissue in certain locations and being able either to temporary activate neurons (using high frequency) or temporary disable neuronal activity (low frequency). TMS is able to highlight causal inferences by analyzing the subject in front of a marketing stimuli while certain brain areas are disabled, stimulated, or normal.







Neuromarketing methodology

Eye Tracking allows studying behavior and cognition without measuring brain activity, but where the subject is looking at, for how long he is looking, the path of the subject's view and changes in pupil dilation while the subjects looks at stimuli. Eye tracking allows measuring the attention focus and thus monitoring types of behavior. Eye movements fall into two categories: fixations and saccades. Fixation is when the eye movement pauses in a certain position and saccade is a switch to another position. The resulting series of fixations and saccades is called a scan path, and they are used in analyzing visual perception, cognitive intent, interest and salience. Eye tracking provides more accurate information than self-report, as research shows that claimed viewing is not always the same as measured actual viewing.



Measuring Physiological Responses to stimuli can provide information on the subject's emotional effects by monitoring the heart rate, blood pressure, skin conductivity (affected by sweat, measuring arousal level), stress hormone from saliva, facial muscles contractions, and inferring the emotional state for each moment. [Bercea,2013]

Response time measures computes the amount of time between stimuli appearance and it's response, informing researchers on the complexity of the stimulus to an individual and how the subject relates to it. This cheap method can be used on recall studies or on measuring subject's attitude towards certain stimuli.







                                                      To be continued...