Attentional blink

The Attentional blink (AB) is a phenomenon that reflects temporal limitations in the ability to deploy visual attention. When people must identify two visual stimuli in quick succession, accuracy for the second stimulus is poor if it occurs within 200 to 500 ms of the first.[1] The AB is typically measured by using rapid serial visual presentation (RSVP) tasks, where participants often fail to detect a second salient target if it is presented within the blink.[2] The AB has also been observed using two backward-masked targets[3] and auditory stimuli.[4][5] The term attentional blink was first used in 1992,[2] although the phenomenon was probably known before.[6][7]

Research

The precise adaptive significance behind the attentional blink is unknown, but it is thought to be a product of a two-stage visual processing system attempting to allocate episodic context to targets. In this two-stage system, all stimuli are processed to some extent by an initial parallel stage, and only salient ones are selected for in-depth processing, in order to make optimum use of limited resources at a late serial stage.[8]

One curious aspect of the attentional blink is that it usually includes "lag-1 sparing". Targets presented very close together in time with no intervening distractors (at "lag 1" or consecutively in the RSVP stream) are not affected by the attentional blink, even though items presented at greater lags with intervening distractors are significantly impaired. This sparing can be spread over multiple targets, as long as no non-target items occur between them in the stream [9]. Lag-1 sparing can be explained by theories in which attentional engagement with the stream is suppressed upon detection of a non-target stimulus [10][11].

According to the LC-NE hypothesis,[12] when a salient, or meaningful stimulus is presented, neurons in the locus coeruleus release norepinephrine, a neurotransmitter that benefits the detection of the stimulus. The effect of this release lasts for 100 ms after the salient stimulus is presented and benefits the second target when presented immediately after the first one, accounting for lag 1 sparing. Eventually the neurons in the locus coeruleus enter a refractory period, due to the auto-inhibitory effect of norepinephrine. According to the hypothesis, targets presented during this refractory period cannot trigger a release of norepinephrine, resulting in the attentional blink. The episodic distinctiveness hypothesis of the ST2 model[13] suggests that the attentional blink reflects a limitation of the visual system attempting to allocate unique episodic contexts to the ephemeral target stimuli presented in RSVP.

The attentional blink is sometimes used to measure differences in attention between particular populations or experimental conditions [14][15]

Emotion

One factor which influences the AB is emotional information. When the second target (T2) in an RSVP stream is an emotionally relevant stimulus it is more likely to be perceived during the period during which the AB typically occurs. The AB is not only modulated by emotional relevance of (T2) but also by the emotional relevance of (T1). When (T1) is emotionally relevant the AB is lengthened and when (T2) is emotionally relevant, the AB is reduced. This suggests that emotion can mediate attention.[16][17]

Theories

The Inhibition Theory

Raymond et al. (1992)[18] suggest that the attentional blink is produced by perceptual uncertainty amongst the target (T1) and following target (T2). They suggest that this confusion happens at some point in the target identification processes. When confusion is eliminated, attentional blink isn't observed. The researchers also suggested that one way to eliminate confusion is to have items that cannot be named.

The Interference Theory

Shapiro et al. (1994)[19] suggest that an interference model may better explain the attentional blink effects than the inhibition model. In this model, the attentional blink is thought to take place because of an out of place item which is selected out of the series because of the interference within the items in the series. Shapiro proposes that the amount of interference increases or decreases with the length of the series.

The Delay of Processing Theory

Giesbrecht and Di Lollo (1998)[20] suggest that the attentional blink over target 2 results when the person is busy processing target 1. It is suggested that anything increasing the difficulty of processing of the first target will result in a greater attentional blink.

The Attentional Capacity Theory

Duncan et al. (1996)[21] suggest that the target 1 takes over parts of our attentional capacity, leading to a deficit of processing or recognizing target 2 when presented immediately after target 1. This theory suggests that the time for which target 1 continues to occupy attentional capacity is related directly to the difficulty of processing target 2.

The Two-Stage Processing Theory

Chun & Potter (1995)[22] suggest that quickly processing a series of items requires two back to back stages. The first stage is the initial rapid-detection. Here, the possible targets are noticed. The second stage is the capacity-limited in which items are taken in order to report later. Stage 2 occurs after the acknowledgement of targets in Stage 1. Here, stage 2 must finishing processing target 1, until then, target 2 will not be recognized in stage 2. If there is a situation where the second target comes in the first stage, the highway to stage two is delayed. Attentional blinking occurs when the second target is in stage 1 which causes a delay. The attentional blink mirror a restriction in the process of combining information from an unstable representation to a stable representation (Johnson & Proctor, 2004).[23]

gollark: Regardless of how much you think the results of elections and such matter, I contest that for an individual, at least, politics is not very important.
gollark: So I appear to have been timed out: obviously, this is a clear sign that Cap and WS's views are correct and stand up by themselves.
gollark: Please pay attention.
gollark: As I said, I lost *ironically* with knowledge of what would happen.
gollark: Anyway, your arguments are unconvincing. I will now explain briefly why politics is unimportant.

See also

References
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  3. Ward, R.; Duncan, J.; Shapiro, K. (1997). "Effects of similarity, difficulty, and nontarget presentation on the time course of visual attention". Perception & Psychophysics. 59 (4): 593–600. doi:10.3758/bf03211867. PMID 9158333.
  4. Arnell, K. M.; Jolicoeur, P. (1999). "The attentional blink across stimulus modalities: Evidence for central processing limitations". Journal of Experimental Psychology: Human Perception and Performance. 25 (3): 630. doi:10.1037/0096-1523.25.3.630.
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  7. Weichselgartner, E; Sperling, G (6 November 1987). "Dynamics of automatic and controlled visual attention". Science. American Association for the Advancement of Science (AAAS). 238 (4828): 778–780. doi:10.1126/science.3672124. ISSN 0036-8075.
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  10. Olivers, Christian N. L.; Meeter, Martijn (2008). "A boost and bounce theory of temporal attention". Psychological Review. American Psychological Association (APA). 115 (4): 836–863. doi:10.1037/a0013395. ISSN 1939-1471.
  11. Wyble, Brad; Bowman, Howard; Nieuwenstein, Mark (2009). "The attentional blink provides episodic distinctiveness: Sparing at a cost". Journal of Experimental Psychology: Human Perception and Performance. American Psychological Association (APA). 35 (3): 787–807. doi:10.1037/a0013902. ISSN 1939-1277.
  12. Nieuwenhuis S, Gilzenrat MS, Holmes BD, Cohen JD (August 2005). "The role of the locus coeruleus in mediating the attentional blink: a neurocomputational theory". J Exp Psychol Gen. 134 (3): 291–307. doi:10.1037/0096-3445.134.3.291. PMID 16131265.
  13. Bowman H, Wyble B (January 2007). "The simultaneous type, serial token model of temporal attention and working memory". Psychol Rev. 114 (1): 38–70. CiteSeerX 10.1.1.452.4843. doi:10.1037/0033-295X.114.1.38. PMID 17227181.
  14. Morrison, Amanda S.; Brozovich, Faith A.; Lakhan-Pal, Shreya; Jazaieri, Hooria; Goldin, Philippe R.; Heimberg, Richard G.; Gross, James J. (1 March 2016). "Attentional blink impairment in social anxiety disorder: Depression comorbidity matters". Journal of Behavior Therapy and Experimental Psychiatry. 50: 209–214. doi:10.1016/j.jbtep.2015.08.006. ISSN 1873-7943. PMC 4679612. PMID 26370394.
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  18. Raymond, J.E.; Shapiro, K.L.; Arnell, K.M. (August 1992). "Temporary suppression of visual processing in an RSVP task: An attentional blink?". Journal of Experimental Psychology: Human Perception and Performance. 18 (3): 849–860. doi:10.1037/0096-1523.18.3.849. PMID 1500880.
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