Welcome to Cognitive Psychology: The Key Theme of Attention
Have you ever been at a loud party, surrounded by dozens of chatting voices, yet instantly tuned in the moment someone across the room whispered your name? Or have you ever been so focused on texting on your phone that you completely walked past a close friend waving right at you?
These everyday experiences show how powerful—and surprisingly limited—human attention really is. In Component 02 of your OCR A Level Psychology course (Psychological themes through core studies), we explore the Cognitive Area through the key theme of Attention. We will look closely at two fascinating studies:
• The Classic Study: Moray (1959) – investigating selective auditory attention (what gets through our hearing filter).
• The Contemporary Study: Simons and Chabris (1999) – investigating selective visual attention (why we can miss obvious objects right before our eyes).
Don't worry if experimental methods seem detailed at first. We will break down every aim, procedure, statistic, and conclusion step-by-step so you feel fully confident for your exam!
Quick Takeaway: Attention is the cognitive mechanism that allocates our limited mental processing capacity to selected information while filtering out the rest.
---Core Concepts: The Vocabulary of Attention
Before diving into the studies, let's master the essential terminology you will need in your answers:
• Attention: The cognitive process of selectively concentrating on specific information in our environment while ignoring competing stimuli.
• Selective Attention: Focusing our conscious awareness on a particular stimulus (like listening to one specific voice in a crowded cafeteria).
• Dichotic Listening: An experimental technique where two different audio tracks are played simultaneously into stereo headphones—one track to the left ear, and another to the right ear.
• Shadowing: A laboratory task where a participant repeats an auditory message aloud, word-for-word, in real time as they hear it.
• Cocktail Party Phenomenon: The ability to focus on a single conversation in a noisy room while retaining the ability to detect personally salient cues (like your own name) from unattended background chatter.
• Inattentional Blindness: The psychological failure to notice a fully visible, unexpected object or event because attention is actively focused on another task.
• Change Blindness: The failure to notice a visual alteration/difference in an object or scene across visual breaks, flickers, or interruptions.
Classic Study: Moray (1959)
Attention in dichotic listening: Affective cues and the influence of instructions
Background & Aim: Building on Colin Cherry's (1953) early work on dichotic listening, Neville Moray wanted to rigorously test how selective auditory attention works. Specifically, he investigated the conditions under which unattended auditory messages can break through the attentional barrier—testing whether affective cues (personally meaningful words like your name) or cognitive instructions (telling someone what to listen for) could pierce the filter.
Standardisation & Apparatus: Moray used a modified Brenell Mark IV stereophonic tape recorder with twin amplifiers outputting distinct audio feeds to stereo headphones. Volume levels were matched subjectively to within approximately \(\pm 1\text{ dB}\). All recordings were spoken by a single male speaker at a constant rate of approximately \(130\) words per minute. Before the trials, participants completed \(4\) practice prose passages to master shadowing.
Experiment 1: Testing the Power of the Attentional Filter
• Design & Sample: Repeated measures design in a laboratory setting. Sample consisted of undergraduates and research workers (males and females; exact sample size not specified in the original paper).
• Procedure: Participants shadowed a short prose message played to one ear (the attended channel). To the other ear (the rejected/unattended channel), a simple list of words was played repeatedly \(35\) times. After a \(30\)-second delay, participants took an unannounced recognition test containing words from the shadowed list, words from the rejected list, and control words that had appeared in neither list.
• Results (Mean Recognition Scores out of \(7\)):
— Shadowed message words: \(4.9\)
— Rejected message words: \(1.9\)
— Control / novel words: \(2.6\)
• Finding: Words from the rejected message were recognized less than novel control words! There was no statistically significant difference between rejected words and control words (\(p > 0.05\)). Even when repeated \(35\) times, neutral words in the unattended ear made no conscious impression.
Experiment 2: Testing Affective Cues (The Participant's Name)
• Design & Sample: Independent measures laboratory experiment with \(N = 12\) participants.
• Procedure: Participants shadowed \(10\) short prose passages. Embedded into the rejected (unattended) channel were \(10\) specific instructions. In the Affective condition, instructions were preceded by the participant's own name (e.g., "John Smith, you may stop now" or "John Smith, change to your other ear"). In the Non-affective condition, the same instructions were given without a name (e.g., "All right, you may stop now").
• Results:
— Affective instructions (with name) heard and acted upon: \(20\) out of \(39\) presentation instances (approx. \(51.3\%\)).
— Non-affective instructions (without name) heard and acted upon: only \(4\) out of \(36\) presentation instances (approx. \(11.1\%\)).
• Finding: This difference was highly statistically significant (\(p < 0.001\)). Personal, affective cues can break through the attentional filter, even when presented to an unattended ear.
Experiment 3: Testing Instructional Set (Expectations)
• Design & Sample: Independent measures design with \(N = 28\) participants divided into two equal groups of \(14\).
• Procedure: Dichotic messages were presented where spoken digits/numbers were interspersed in both the shadowed message and the rejected message.
— Group 1: Instructed beforehand that they would be asked questions about the content of the shadowed message.
— Group 2: Explicitly instructed beforehand to remember as many numbers as possible.
• Results: There was no statistically significant difference in the mean number of digits recalled from the rejected message between the two groups.
• Finding: Simply telling someone to listen out for numbers (setting their expectations) is not enough to break the attentional filter for non-affective material.
Moray's Key Conclusions
1. When attention is directed to one ear, almost all verbal content presented to the unattended ear is blocked from conscious report.
2. Neutral verbal material cannot break through the attentional barrier, even when repeated up to \(35\) times.
3. Subjectively important, affective material (such as hearing one's own name) can overcome the attentional barrier and be consciously processed.
4. Mental expectations or instructions alone cannot force neutral, non-affective material past the attentional filter.
Key Takeaway for Moray: The auditory filter is extraordinarily strong for neutral information, but personally significant (affective) cues can bypass this filter.
---Contemporary Study: Simons & Chabris (1999)
Gorillas in our midst: sustained inattentional blindness for dynamic events
Background & Aim: Previous visual attention research mostly used static images or brief computer displays. Simons and Chabris wanted to investigate sustained inattentional blindness in complex, dynamic visual events. They aimed to test the effects of four key factors on whether people would notice an unexpected intruder:
1. Visual Display Type: Transparent video vs. Opaque video.
2. Unexpected Event Type: Umbrella-Woman vs. Gorilla.
3. Attended Team: Watching the White team vs. watching the Black team.
4. Task Difficulty: Easy mental pass count vs. Hard mental pass count.
Design, Sample, and Experimental Setup
• Design: Laboratory experiment using an independent measures design arranged into a \(2 \times 2 \times 2 \times 2\) factorial layout (\(16\) individual experimental conditions).
• Sample: Initially \(228\) participants (mostly undergraduate students at Harvard University). After discarding \(36\) participants (due to prior knowledge of the effect, failing pass counts, etc.), the final sample was \(N = 192\) participants (\(12\) participants in each of the \(16\) conditions).
• Materials & Video Clips: Participants watched a \(75\)-second video clip. In the video, two teams of \(3\) players (one team wearing White shirts, the other wearing Black shirts) moved around in a \(3\text{ m} \times 5\text{ m}\) space passing a standard basketball. Standardised testing protocols were run by \(21\) experimenters.
The Unexpected Event: Between \(44\text{--}48\) seconds into the video, an unexpected event lasting \(5\) seconds entered the scene from camera left, walked across the court, and exited camera right:
• Umbrella-Woman Condition: A tall woman holding an open umbrella walked across the court.
• Gorilla Condition: A person in a full gorilla costume walked across, stopped directly in the center of the court, turned to face the camera, thumped its chest, and walked away.
The Four Independent Variables (IVs):
• IV 1 - Video Transparency: Transparent (each team, basketball, and unexpected character filmed separately and digitally superimposed, making them semi-translucent) vs. Opaque (all actors filmed live together, appearing fully solid and visually occluding each other).
• IV 2 - Unexpected Event: Umbrella-Woman vs. Gorilla.
• IV 3 - Attended Team: Count passes made by the White Team vs. count passes made by the Black Team.
• IV 4 - Task Difficulty: Easy (keep a mental running count of all passes made by the attended team) vs. Hard (keep separate mental running counts of bounce passes vs. aerial/chest passes made by the attended team).
Procedure & Debriefing
Participants were tested individually. Immediately after the video, they wrote down their pass counts. Next, the experimenter asked four standardized debriefing questions:
1. "Did you notice anything unusual in the video?"
2. "Did you notice anything other than the six players?"
3. "Did you see anyone else walk onto the court/screen?"
4. "Did you see a gorilla / woman carrying an umbrella walk across the screen?"
Key Findings & Percentages
• Overall Inattentional Blindness: Across all conditions, \(46\%\) of participants failed to notice the unexpected event (meaning \(54\%\) noticed it).
• Display Type: Significantly more participants noticed the event in the Opaque condition (\(67\%\)) than in the Transparent condition (\(42\%\)) (\(p < 0.001\)).
• Task Difficulty: Significantly more participants noticed in the Easy task (\(64\%\)) than in the Hard task (\(45\%\)).
• Event Type: The Umbrella-Woman was noticed significantly more often (\(65\%\)) than the Gorilla (\(44\%\)).
• The Similarity Effect: When watching the Black team, \(58\%\) noticed the Gorilla, but when watching the White team, only \(27\%\) noticed the Gorilla! This proves that visual similarity between the attended target and the unexpected object dramatically increases detection.
Simons & Chabris Conclusions
1. Sustained inattentional blindness occurs frequently in dynamic, realistic visual environments.
2. Inattentional blindness increases with higher cognitive load (harder primary tracking tasks).
3. Observers are much more likely to detect an unexpected dynamic event if it shares visual features (e.g., color) with the stimuli they are actively monitoring.
4. Visual perception is not automatic: there is no conscious perception without focused attention.
Key Takeaway for Simons & Chabris: Even when a chest-thumping gorilla walks right through our center of vision for \(5\) seconds, we can completely fail to see it if our cognitive attention is occupied elsewhere.
---Comparing Classic and Contemporary Studies
How Simons & Chabris Broadens Understanding of Attention
In Section A exam questions, you are often asked to compare Moray (1959) and Simons & Chabris (1999) and explain how the contemporary study changes or broadens our understanding of the key theme.
1. Sensory Modality:
• Moray (Classic): Investigated selective auditory attention (dichotic listening / hearing).
• Simons & Chabris (Contemporary): Broadens the theme to selective visual attention (inattentional blindness in dynamic video scenes).
2. Factors Affecting Attentional Breakthrough:
• Moray: Breakthrough is driven by affective/semantic salience (personally meaningful verbal cues, such as the participant's name).
• Simons & Chabris: Breakthrough is driven by visual similarity (matching color/features to attended items) and cognitive load (task difficulty).
3. Understanding of Human Limitations:
• Moray demonstrated that unattended auditory messages are filtered out unless they possess personal emotional value.
• Simons & Chabris extended this to prove that our attentional filter is multi-modal: we don't just "fail to hear" background chatter; we can fail to see large, salient objects directly in front of our eyes if our cognitive processing capacity is overloaded.
Exam Pitfalls & Common Misconceptions to Avoid
• Mistake 1: Confusing Inattentional Blindness with Change Blindness.
Inattentional blindness is missing an unexpected stimulus that walks right through a scene while you are busy focusing on a primary task. Change blindness is failing to notice a change/difference between two scenes across a visual cut, flicker, or gap.
• Mistake 2: Conflating Moray's Three Experiments.
Make sure you know which experiment tested what:
— Experiment 1 = Word lists repeated \(35\) times (recognition test).
— Experiment 2 = Participant's own name (affective cues vs. non-affective instructions).
— Experiment 3 = Digits and instructional set (telling participants to listen for numbers had no effect).
• Mistake 3: Exaggerating Inattentional Blindness Rates.
Do not write "Nobody saw the gorilla" or "90% of people missed it." In reality, overall \(54\%\) noticed it and \(46\%\) missed it. In the opaque easy condition, detection was \(67\%\) or higher!
• Mistake 4: Blaming Poor Eyesight or Peripheral Vision.
Participants did not miss the gorilla because it was blurry or in their peripheral vision. The gorilla walked directly across the center of the screen! The blindness was purely cognitive (a failure of attention, not optical vision).
Memory Aid / Quick Summary Checklist
• Moray (1959): Auditory attention • Brenell Mark IV tape recorder • Matched to \(\pm 1\text{ dB}\) • \(130\) wpm • Exp 1: \(35\times\) repeated words not recognized (\(1.9\) vs \(2.6\) control) • Exp 2: Name heard \(51.3\%\) (\(20/39\)) vs no name \(11.1\%\) (\(4/36\)) • Exp 3: Instructions to listen for digits failed to help.
• Simons & Chabris (1999): Visual attention • \(192\) participants (\(16\) conditions, \(12\) per cell) • \(75\)s video, \(5\)s unexpected event at \(44\text{--}48\)s • Overall \(46\%\) blind (\(54\%\) saw it) • Opaque (\(67\%\)) > Transparent (\(42\%\)) • Easy (\(64\%\)) > Hard (\(45\%\)) • Umbrella (\(65\%\)) > Gorilla (\(44\%\)) • Gorilla seen more by Black team trackers (\(58\%\)) than White team trackers (\(27\%\)).