Attentional bias

Attentional bias refers to how a person's perception is affected by selective factors in their attention.^[1] Attentional biases may explain an individual's failure to consider alternative possibilities when occupied with an existing train of thought.^[2] For example, cigarette smokers have been shown to possess an attentional bias for smoking-related cues around them, due to their brain's altered reward sensitivity.^[3] Attentional bias has also been associated with clinically relevant symptoms such as anxiety and depression.^[4]

In decision making

A commonly studied experiment to test for attentional bias is one in which there are two variables, a factor (A) and a result (B). Both can be either present (P) or not present (N). This results in four possible combinations:

Both the factor and result are present (AP/BP)
Both the factor and result are not present (AN/BN)
While the factor is present, the result is not (AP/BN)
While the result is present, the factor is not (AN/BP)

The four combinations can be shown in table form as follows:

	A present (A)	A not present (A')
B present (B)	AP/BP	AN/BP
B not present (B')	AP/BN	AN/BN

A common question which follows the structure of the above experiment is: "Does God answer prayers?"^[5] Due to attentional bias, theists tend to say "yes". They focus on the present/present (A/B) cell, as their religious beliefs in a deity cause them to fixate on the occasions when they were given what they asked for, thus they use the justification: "Many times I've asked God for something, and he's given it to me." Similarly, due to attentional bias, atheists equally tunnel on data from the present/absent (A/B', A'/B) cells: "Has God ever given me something that I didn't ask for?" or "Have I asked God for something and didn't receive it?" This experiment too supports Smedslund's general conclusion that subjects tend to ignore part of the table depending on their specific attentional biases.^[2]

The scenarios can be illustrated below in a similar table to above:

	Asked God for A (A)	Did not ask God for A (A')
A was fulfilled (B)	A/B	A'/B
A was not fulfilled (B')	A/B'	A'/B'

When making decisions, attentional biases toward positive stimuli have been associated with numerous positive outcomes, such as increased social engagement, increased prosocial behaviour, decreased externalizing disorders, and decreased emotionally withdrawn behavior.^[6]^[7] In contrast, individuals with clinically relevant symptoms, such as anxiety disorder^[1] and chronic pain^[8] are shown to prioritize threat cues over reward cues.^[9]^[10]^[4]^[11] In one experiment, faces with varying valences were presented (neutral, threatening, and happy) with a forced-choice reaction time at two exposure durations, 500 and 1250msec. For individuals with high trait anxiety, there was strong evidence for an attentional bias favoring threatening facial expressions. Additionally, increased dysphoria correlated with the tendency to avoid happy faces.^[12]^[13] This tendency leads to a spiraling effect, as one will only see negative faces, which induces greater anxiety, which exacerbates the aforementioned tendency to avoid positive stimuli – a form of the vigilance-avoidance pattern.^[14]

Notably, there is also a difference in attention biases between anxious and depressed individuals. Word pairs were shown to the subjects, with a dot probe following a word of each pair (dot probe paradigm). One-half of the word pairs were presented on the subliminal level, and the other half were presented on the supraliminal level, and then the response time was measured. As expected, the anxious and depressed groups showed an attentional bias towards negative words compared to the normal control group. On a supraliminal level, the depressed group showed greater vigilance for threat stimuli than the anxious group. However, for subliminal threat stimuli, the anxious group showed a greater vigilance, which implies an anxiety-related bias on the subconscious level.^[15]

In addictive behaviour

Research from the past two decades has established that addictive behaviour is strongly correlated to the attentional bias for substance-related cues, in how the latter characterizes the former.^[16] An example of this is smoking and smoking-related cues.^[3]

Research (using the Stroop paradigm) tested the effect of mixing smoking related words (cigarette, puff, and smoke) with: negative connoting words (sick, pain and guilty), positive connoting words, (safe, glad, and hopeful) and neutral connoting words (tool, shovel, and hammer). Results showed a strong correlation between a slower reaction time and the degree of negative language employed when discussing smoking. The results indicate attentional bias, suggesting the influence negative language has had on the individual attitude towards smoking.^[17] When asked to think of the negative consequences of smoking, as the negative language evoked underlying negative feelings toward smoking, they displayed fewer cravings than the smoker subjects who were encouraged to smoke.^[18] The experiment illustrates the influence of attentional bias on environmental smoking cues and how these could contribute to a smokers' inability to quit. As stated earlier individuals' attentional biases are influenced by subliminal stimuli, so in the smoker's case, they are more subject to substance-related stimuli such as observing other smokers or noticing ads for cigarettes.^[19] The stimuli evoke expectancy of substance availability, which creates a further attentional bias for substance-related stimuli and induces craving for the substance.^[16]

Similar Stroop paradigm studies have concluded that attentional bias is not dependent on smoking itself, but rather the person who is the smoker displays attentional bias. A recent study required one group of smokers to refrain from smoking the night before and another less than an hour before. Abstinence from smoking created a slower reaction time, but a smoke break between study sessions showed increased reaction time. Researchers say this shows that nicotine dependence intensifies attention, but does not directly depend on smoking itself due to lack of evidence.^[20] The longer reaction time suggests smokers craving a cigarette linger on smoking-related words.^[21] Smokers and smokers attempting to quit displayed the same slower reaction time for smoking-related words,^[22] which supports research that implies attentional bias is a behavioral mechanism versus a dependency mechanism, due to the fact that the smokers were slowed down by smoking-related words and negative words, but not slowed down by positive and neutral words.

Drug addiction is also an example of attentional bias in that certain memories or objects can prompt intense cravings for one's drug of choice. It is easier for individuals who experience this to relapse and begin their drug use again, because the urges given off by that initial stimuli can prove to be too strong to curb.^[23] There are some ways that individuals could overcome attentional bias, and a solution is stimuli-related therapy. This type of therapy would give those struggling with addiction and relapse an opportunity to overcome the initial fear associated with a particular object. A study conducted by a group of researchers in the Netherlands found that by giving participants an opportunity to attend therapy sessions during their treatment for drug addiction, more participants remained drug-free compared to those who relapsed.^[24] Therefore, the conclusion can be drawn that with exposure therapy, the number of patients who will leave a treatment facility and relapse decreases. The Stroop Test also showed in this study that between the control group and the treatment group the only major component of the test was time; researchers made the claim that those who received treatment reacted a lot faster to certain drug-related stimuli versus those in the control group who did not.^[24] This means that when experiencing attentional bias, treated addicts seemed to brush off the memories a little easier compared to those who had not received proper treatment. In other words, certain steps need to be taken in treatment facilities across the country to ensure that drug addiction no longer rises, or continues to ruin people's lives. Also, a therapy of this kind should be closely monitored and mandatory to ensure the smallest number of relapses occur after treatment.

Measurements

There are two different forms of attentional bias that can be measured:

Within-subject bias: When there is a significant difference between an anxious individuals' attention bias towards threat-related stimuli and attention bias towards neutral stimuli (which usually favors threat-related stimuli)^[1]

Between-subject bias: When there is a significant difference between non-anxious and anxious individuals' attention bias towards and neutral stimuli and threat-related stimuli^[1]

Measurement paradigms

There are four main paradigms used to measure attentional bias:^[4]

Stroop paradigm: The Stroop paradigm was the first measure of attentional bias.^[4] It also uses reaction time, only in this case utilizing colors. The subject would have to read the color of the word (e.g. brown), however, the name of the word would be a different color (e.g. red). Variations involve the opposite, where one would have to read the name of the word, but the color of the word would differ.

Dot-probe paradigm: The dot-probe paradigm/task is the gold standard in attentional bias research, considered an upgraded version of the dot-probe paradigm.^[4] Two stimuli of difference valences are presented simultaneously for a fixed time. Then, a probe replaces one of the two stimuli, which the participants have to respond to – by classifying the probe or responding to the location.^[14]

Posner paradigm: The Posner paradigm or Posner cueing task is similar to the dot-probe paradigm.^[4] It is a sight test, which assesses the individual's ability to switch and focus on different stimuli presented. The subject focuses on a specific point, then attempts to react as quickly as possible to target stimuli presented to the sides of the specified point.

Visual search paradigm: The visual search is a less used method of assessing attentional bias.^[14] It involves measuring one's ability to spot and discern particular objects among other objects.

While the other options are valid methods, they all tap into different aspects of attention bias.^[1] Because of this, some methods are less used when looking into specific aspects of attentional bias. For example, in a posner cueing task, the cues were either a neutral, angry or happy, facial expression. There were both valid (targets appearing in the same location as the cue/face) and invalid trials (The target appearing in a different location to the cue/face). Surprisingly enough, in the invalid tests, individuals' response times increased to the same degree of attentional bias for both negative stimuli and positive stimuli, contrary to hundreds of other studies.^[13]

Mechanisms

On a scientific level, attentional bias often seen in eye-tracking movements is thought to be an underlying issue of addiction. Smokers linger on smoking cues compared with neutral cues. Researchers found higher activation in the insular cortex, the orbitofrontal cortex and the amygdala when presented with smoking cues. The orbitofrontal cortex is known to be coordinated with drug-seeking behavior and the insular cortex and amygdala are involved in the autonomic and emotional state of an individual.^[25]^[26]

Neural activity is also known to decrease upon the beginning of smoking, focusing the smokers' attention on their upcoming cigarette. Therefore, when smoking cues are nearby it is harder for a smoker to concentrate on other tasks. This is seen in the activation of the dorsal anterior cingulate cortex, known for focusing attention on relevant stimuli.^[27]^[28]

However, beyond this, the mechanisms of attentional bias is an uncertain area, as there are many conflicting theories on how attentional biases operate.^[1] An initial theory was schema theory, in which it was believed schema was biased towards threats, thus threat-related material is always favored in cognitive thinking.^[29] Conversely, other individuals have argued that humans are prone to attentional biases at certain points of information processing, which is now a more common topic of controversy.^[14]

Psychologist J. Mark G. Williams and colleagues have argued that anxious individuals tend to prioritize threat stimuli during early information processing, and direct their attention away from threats in more strategic stages of processing.^[30] This correlates with the vigilance-avoidance pattern, which is when one initially directs attention to threat, however then proceeds to avoid processing details and information in order to avoid an anxious state of mind.^[14] Conversely, others theorize that anxiety has little impact on initial detection of threats but has is more significant in modulating the maintenance of attention on the source of the threat.^[1] This can be explained by the alternative theory to the vigilance-avoidance pattern, which is that anxious individuals, once processing the threat, struggle to disengage attention from the threat stimuli due to reasons such as fear.^[14]

Regardless of the opinions, there have been numerous studies which attempt to find the ultimate explanation. However, there have been results which support both theories, thus making the mechanisms of attention bias an uncertain topic.

Variables

Time

In one study, stimulus exposure duration was tested against attentional bias for threat stimuli (for non-clinical anxiety). Individuals were given exposure durations of 100, 500, and 1500 millisecond intervals. However, there seemed to be no significant change in the bias towards threat stimuli.^[14] The experiment has yet to be tested for clinical anxiety.

Neurocognitive function

A study also explored the negative relationship between neurocognitive function and attentional bias. Individuals with a lower capacity in the attentional domain, particularly in digit symbol coding, exhibited more attentional bias toward threats.^[14]

Clinical applications

The link between attentional biases and addictions illustrate how controlling attentional processes may be essential in assisting smokers who are trying to quit. However, this is not dealt with, as in the case of the United Kingdom (UK), the Stop Smoking Services (SSS) and National Health Service (NHS) both have yet to target attentional biases in their smoking cessation programs.^[3]

Individuals with clinically relevant symptoms, such as anxiety disorders^[1] and chronic pain^[8] are shown to initially focus on threatening information.^[9]^[10]^[4]^[11] However, there is still uncertainty regarding the causes of this relationship. Two studies explored the causes by using a modified dot-probe paradigm and experimentally inducing differential attentional responses to emotional stimuli and then noting the effect on the consequential emotional vulnerability. The results confirmed how inducing attentional bias can alter emotional vulnerability, thus introducing the possibility that cognitive-experimental procedures designed around these results have potential therapeutic value in the future.^[11]

References

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