Chapter 1. Attentional Blink

1.1 Introduction

Cognitive Tool Kit
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Attentional Blink

Our limited ability to process everything happening around us is a fundamental fact of the way we experience the world and a key area of study in cognitive psychology. These limits on our attention encompass, for example, the amount of material we can remember at a given time, the number of stimuli we can take in, and the number of responses we can make. Even when you and a friend are in the same room, your friend may not be able to pay attention to what you are saying or doing because they can only attend to a few of the stimuli and events going on at a time.

This experiment is designed to examine different ways in which attention is limited. If attention is directed toward one stimulus, other stimuli are ignored. In this study, we will see if responding to one stimulus influences our ability to respond to another stimulus that occurs shortly after the first. To do this experiment, we will use what is called Rapid Visual Serial Presentation (RSVP): stimuli are presented in the same location, one after the other.

References:

Raymond, J. E., Shapiro, K. L., & Arnell, K. M. (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.

1.2 Experiment Setup

1.3 Instructions

Instructions

You will need to press the space bar to begin the experiment. At the beginning of each trial, a fixation mark will appear. Please look at this mark. After it is removed, letters will be presented rapidly in the same location as the fixation mark. There are two targets:

J and K

Key What Response Means
J 'J' appeared in the trial.
K 'K' appeared in the trial.
R Repeat trial.

Either one or both can be present in each trial. After the sequence is done, type the J key if you saw the J and type the K key if you saw the K. You may type them in any order. Your responses will be displayed at the bottom of the screen. If you make a mistake, you may use the delete key to remove a letter. If you need to repeat a trial because something distracted you, press the R key and the trial will be repeated at a random time later. Press the space bar to proceed to the next trial.

1.4 Experiment

Begin Experiment

1.5 Results

Results

1.6 Quiz

Quiz

Question 1.1

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1
Incorrect.
correct
The independent variable is the value that is changed by the experimenter. In this experiment, this variable is the time between the presentation of the two targets.

Question 1.2

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1
Correct.
Incorrect.
The dependent variable is the value the experimenter collects to indicate how you performed in the experiment. In this case, we determined how many targets you correctly reported having seen. So the correct answer is percent correct.

Question 1.3

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1
Correct.
Incorrect.
This experiment examines how we are able to process only one stimulus at a time. This ability to process some stimuli and not others is called attention.

Question 1.4

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Correct.
Incorrect.
The standard finding is that the longer the separation between targets, the more often the second target is recalled.

Question 1.5

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Correct.
Incorrect.
Raymond and colleagues (1992) proposed the name attentional blink for this effect in the title of their paper.