Human Factors in Simulation

June 11, 2013


Medical mannequin simulator (photo: US Navy)

Human factors are extremely important in simulation, as this 2009 book points out. Human-factors expertise is important both in simulating human beings and in the use of simulations by human beings.


Physical human limits (image: AnyBody public repository)

Issues involved in simulating human beings include physical and ergonomic factors, as well as human behaviour modelling (the subject of this workshop). In training simulations, it is important to fully understand the human process which is to be improved by simulator training. This can include subtle issues such team interaction, as well the more obvious factors.


Pilot landing cues? (screenshot from FlightGear)

There is also a plethora of human-factors issues in the development, design, conduct, debriefing, and debugging of simulations relating to the use of simulators by human beings. Negative training, for example, occurs when users of a training simulation learn the wrong knowledge, skills, or behaviours. This can be the result of low-fidelity representation of important decision or feedback cues, of timing delays, of incorrect or incomplete problem representations, or of other simulator design flaws. It is impossible to build a simulator with 100% fidelity, and even 99% fidelity would be prohibitively expensive. To achieve the required outcomes, where is high fidelity necessary? Human-factors expertise is essential in answering that question.

Simulator sickness affects many users of flights and vehicle simulators, and limits the potential benefits of such simulators. See this 2005 study for an overview of research in this area.

In training simulations, a variety of cognitive-psychology factors also come into play. Likewise, in decision-support simulations, it is important to understand the limits of the conclusions that can be drawn. Which results tell us meaningful things about the problem at hand, and which results simply reflect characteristics of the simulation?

Simulation is an extremely valuable tool for both training and decision support. Yet, for the best results, it is important to take into account human factors in both the design and the use of the simulation.


Vehicle simulator (photo: US Army)

– Tony

Advertisements

Incisive Cognitive Analysis: Solving the Crime at Mile 26 of the Boston Marathon

April 17, 2013

Incisive Cognitive Analysis: Solving the Crime at Mile 26 of the Boston Marathon

The work and performance of human and machine cognitive agents in intelligence analysis. How — and why — they will apprehend the perpetrators of the Boston Marathon Bombing.

Cross Blogged from HVHF Sciences.


Driver Distraction – are we being distracted away from real solutions?

October 29, 2012
Person using cell phone while driving.

Person using cell phone while driving. (Photo credit: Wikipedia)

 

Driver distraction is a major cause of accidents on our roads.  More research into driver distraction is therefore welcome.

 

Traditional media available in vehicles, such as radios and entertainment systems, can affect visual attention, and the current use of GPS navigation assistance and personal communication devices have been repeatedly shown to interfere with the primary driving vigilance and motor control task.  Such research has informed road authorities to restrict their use, particularly with regard to mobile phone use and texting for example.

 

The introduction of Intelligent Transport Systems has the potential to overload the driver if such systems are not tailored to driver workload according to location, traffic density and other ambient conditions.  A more accurate and layered approach to driver workload and attention level can provide a structure upon which information can be conveyed appropriately and distractions reduced or minimised.

Hume Freeway looking south towards Victoria, r...

Hume Freeway looking south towards Victoria, running parallel to Albury railway station. (Photo credit: Wikipedia)

 

There are many instances however where use of communication devices in vehicles may actually help in vigilance (for example, long distance driving) and the ability to operate a mobile office whilst driving has undoubted productivity benefits.  The problem is that the driving environment can potentially change in milliseconds and cause an overload of the driver’s available perceptual and attentional resources.

 

The aspect of appropriate speed limits in long distance driving could also be re-addressed.  There has been a spate of single driver transport accidents on the Hume Freeway recently which have had tragic (and potentially disastrous consequences). Apart from driver fatigue and scheduling issues, is the posted speed limit too low to maintain sufficient driver arousal levels?  Long boring drives at inappropriately low speeds could also encourage further distraction (such as use of mobile devices) perhaps even increasing the potential danger.  This may not be ideal given that the severity of an incident at 100kph is still as catastrophic as one at 110 or 120kph.  If speed kills, then surely it follows that the only safe speed is zero. There is a balance between the efficient movement of goods and the consequences of error.  Does this mean that interstate transport needs to travel at 40kph so that any incidents that occur are relatively minor? Would this result in more incidents because drivers would be bored out of their minds whilst blowing out transport schedules? There needs to be an open discussion by professionals in the field as to assessment of all of the risks rather than the current thinking that slowing traffic is the only solution as seems to be the case at present.  The posted speed relative to the road design and condition could be reducing driver arousal and performance level below the desired optimal range.

 

60KM/H Speed limit sign in Australia.

60KM/H Speed limit sign in Australia. (Photo credit: Wikipedia)

The Human Machine Interface (HMI) remains central to safe and effective vehicle operation as the information it provides will allow the driver to retain effective control of the vehicle and help influence or even determine their behaviour. Information flow to the driver must be intuitive, readily understood, timely, and be responsive to driver attentional and distraction state.  Unfortunately, there are many who have very little understanding of this requirement. For example, presentation of the “bells and whistles” mentioned in this proposed level crossing warning system  may actually distract a driver at the worst possible time and cause more problems than the technology is trying to solve. Human scientists understand the many facets that determine the best way of presenting information so that it is perceived, recognised and acted upon in an optimal manner.  If the proponent of this system had engaged human factors expertise in the first place or heeded their advice he may not have made such ill-considered comments. Perhaps he may get some guidance as to the importance of listening to human factors professionals when he presents his data at the upcoming ITS conference in Vienna. It would be good to have some critical assessment by any human scientists attending this conference of any actual (rather than derived or contrived) interactions that occurred during the trials which were conducted of this system.

 

The area of human interaction with technology is very complex and simplistic approaches (such as further unrestrained visual or auditory “bells and whistles blaring”) will rarely be the best solution.  All the more reason to design and test proposals from a human science standpoint, heed the results and incorporate them into any proposed system.  Which underscores the importance of the many respected facilities that incorporate human science input as a keystone of their research in ITS applications, vehicle design and driver behaviour.  Hopefully their research findings are weighted appropriately (ie. seen as valid and reliable) by the governing authorities as compared to those of the “bell and whistle” variety.

 

 

 

 

 

 

 

 

 


Lollies or Poison

October 16, 2012

Human factors covers many facets of human behaviour and interaction with the natural and constructed environment.  The issue of how to ensure that these environments remain safe for the younger and older members of our society is a case in point.Post image for Product Confusability: Tide Pods

Recently, a dishwashing detergent was packaged so that even adults could easily mistake them for food.  Young children have ingested these dangerous chemicals as the packaging is very colourful and resemble candy or lollies.  The harm done to these children and the increasing toll on the health system would surely outweigh the financial benefit to the manufacturer of this product, who obviously either didn’t think or was blissfully unaware of the consequences.  Perhaps the unwanted publicity of the dangers of this product, especially if there is an impact on their bottom line, may encourage them to design their products with more care in future.

All too often, human behaviour is not taken into account in the design of products.  No amount of urging customers to “be careful” will eliminate the danger posed by badly designed or labelled goods.  It is better business to design them properly in the first place.

When I was involved in training service and police dogs, there were five principles which used to guide us.  Firstly, Knowledge was required – if you didn’t know what you were doing, it made it difficult for the canine to know what was required.  Secondly, Repetition showed the required behaviour.  Thirdly, Patience in attaining the goal was essential.  Praise and Correction were the final principles, the former being more desirable and effective.  It seems that in the case of the design of the products described above, the first fundamental principle was lacking, as is commonly the case in many other applications where the knowledge and expertise of the human scientist is not sought or ignored.

This translates to the whole range of human applications.  Human scientists can provide critical knowledge but this fact is not often understood and can have great impact, both in terms of time and budget when ill informed decisions are made, and especially when the younger and older members of society are involved.

As has been previously posted, the initial BMW iDrive was a product which was installed in vehicles that the older demographic was more likely to acquire, which compounded the problems of poor initial design.  The older drivers did not have the digital savvy or knowledge that their offspring or grandchildren had and therefore the whole concept was flawed from the outset as it did not take into account the basic metrics of the human operator.  Of the five principles that I listed above, Patience is in short supply when you are battling traffic!

Which leads to the point made by the authors of the pieces – consideration of the special needs of the younger and older demographic is central to good design and outcomes going forward.


The rise of the drones

September 17, 2012
Kawasaki KAQ-1 Drone at Castle Air Museum

Kawasaki KAQ-1 Drone at Castle Air Museum (Photo credit: Wikipedia)

The ever increasing ability and availability of drone technology will have a major impact on defence and law-enforcement operations in the future.  Where capabilities of platforms used to be defined by the ability to deploy various assets within the capability of a class or type of vessel ( in naval operations for example, a carrier vs an offshore combatant vessel), the latter smaller platforms may soon be able to deploy an aerial capability which could previously only be provided by the larger and far more expensive vessels.

As noted in the article, this can have far-reaching consequences for navies where the majority of tasks are routine patrol and ‘constabulary’ operations of protecting sea lanes and territorial integrity.  With drone technology, a single smaller platform could perform tasks which currently require several more capable and expensive assets (for example, the patrol of a shipping route subject to piracy).

A telling point made in the article is the close involvement of the human in the loop.  Similar to other advances in automation, the command and control function remains within the human domain.  As stated “…there will inevitably be a human in the operational Observe, Orient, Decide and Act (OODA) loop – be they a remote operator, data handler oFull diagram originally drawn by John Boyd for...r decision maker within any of a number of mission sets.”

So the design of the HMI will determine how successful this shift in technology will be.  As has been seen in Afghanistan, the ability of the remote operator of a drone aircraft to gain and maintain situational awareness to perform their mission without unintended consequences will greatly depend on the amount, type and quality of information available to them and what range of tasks they need to perform.  Many combat aircraft have a crew of two due to the separate and demanding pilot and SA/engagement tasks, and military drone strike operations seem to reflect this crewing model. Perhaps this model is a historical legacy which may also change in the future as drones dispense with the constraint of having to fit the aircrew into the platform.

This may cause a shift in emphasis of the Human Factors and Ergonomics discipline.  A lot of effort was traditionally expended in the physical anthropometric ergonomics aspect of the human in the loop probably because it was so obvious. For example, range of movement, posture etc within a cockpit could be calculated and the 95thpercentile adopted as a standard which could then be used to determine interaction within the crew space available in the airframe. As we all know, engineers love standards, so perhaps this aspect was pursued to the detriment of equally or possibly more important aspects of the human/machine interface.

Computer Workstation Variables

Similar adoption of standards cannot be readily applied to much more esoteric aspect of neurological interaction with a system. For example, although it provides a very good framework to predict and test how an operator will interface with a HMI, Multiple Resource Theory doesn’t provide the level of certainty available from physical ergonomic models. Each aspect needs to be tested according to the many variables which could arise and the neural adaptability inherent in the human which makes them so important to the command and control function.  That’s why the non-physical human interaction field is so interesting to us practitioners (and perhaps perplexes many physical scientists who cannot seem to grasp the notion that humans cannot be treated as a simple probability or linear contributor in their decision models).

So while drone technology will enhance capability, it will only do so effectively if there is a requisite paradigm shift in how the interface is designed to incorporate the more difficult ‘neural ergonomic’ aspects described above.  Perhaps we can finally move away from the tyranny of standards which are sometimes adopted without further thought for the equally important sensory, perceptual and cognitive aspects which we pesky Human Factors types are constantly trying to highlight to our seemingly dullard peers in other fields, sometimes with, but unfortunately many times without success.


Vehicle Displays

September 10, 2012
Driver in a Mitsubishi Galant using a hand hel...

Driver in a Mitsubishi Galant using a hand held mobile phone violating New York State law. (Photo credit: Wikipedia)

I went to a workshop the other day and heard that a major vehicle manufacturer had adopted the use of touch screen control panels for all of their products.  The speaker had been employed to study the human factors associated with these. His talk was very disturbing – drivers needed more visual attention to use these things effectively as they needed fine motor control (and therefore visual attention) to press the correct area on the screen for their selection, especially if the vehicle was pitching due to the road surface or other conditions.  It made me wonder what bright spark in the company had decided that these displays were a good way to go.  When we are trying so hard to reduce mobile phone and texting use because of the clear and significant problems they pose to road safety, we have a vehicle manufacturer that decides to integrate something into the vehicle which will undo everything that road safety authorities have so far done in this area due to a lack of understanding of the issues involved.

I thought that we had learned from the initial BMW iDrive that technology for its own sake is not necessarily the way to go.  It speaks volumes that BMW now have a very much enhanced vehicle control system which includes haptic feedback so that there is nowhere near the impact on visual resources that the original design had.  And that’s good as the more visual attention is focused on the road, the safer all users will be (put it this way – if a driver is not looking at the external visual field there is no way that they can perceive and react to a potentially dangerous situation).

It made me call to mind a conversation with an engineer who was working on electric vehicles.  He said that they would incorporate noise into the car to emulate the typical sound of current cars.  He insisted that it was the only way to retain safety for pedestrians. It called to mind the situation where a man with a red flag used to signal the approach of ‘horseless carriages’ when they were first introduced in the late nineteenth century.  Why would you introduce noise into the environment when it may not be necessary – surely that is one of the advantages of electric vehicles?  Imagine a city with substantially less road noise (and perhaps more liveable?) as a result.

One disadvantage of course is that the auditory warning provided to pedestrians and other users would not be present, but I’m sure that we have the technology to overcome this aspect.  The almost ubiquitous use of entertainment devices by commuters effectively attenuates these auditory cues in any case as has been tragically illustrated by pedestrians being killed because they stepped out in front of approaching vehicles whilst listening to music from their iPods. However, DSRC network technology could easily provide warning information to pedestrians if it is set up correctly and integrated with the mobile communication networks.  Of course, there would need to be considerable human factors input so that any system is designed properly.

I suppose that all of these examples illustrate the importance of the latter aspect.  It would have been great if the vehicle manufacturer described at the beginning of this post had taken the step of actually testing their idea from a human perspective prior to making such a retrograde decision.  We now have vehicles which inherently create a similar problem to mobile phone use and texting problems that we are trying so hard to overcome – a safety time bomb in each of the vehicles produced by this company. Similar to faulty brakes or steering as it may have the same effect on road safety

One can only hope that the engineers, accountants and marketers who seem to rise to the top of these companies will realise the importance of fundamental human factors in their future products. Not just aspects such as usability testing, but the integral way that humans sense, perceive and process information.  Perhaps we can then apply a safety systems approach to road use and reap the benefits of eliminating the contributors to potential incidents (such as poor vehicle controls) before they occur.


Are Security Questions a Joke? Or is the way the Systems are Designed the Real Joke?

August 9, 2012
Security questions

Security questions (Photo credit: janetmck)

I read a great article the other day on the threat posed by the use of password security questions as a Computer security issue.

I too have been quite amused by the poorly designed questions which purport to help you if you forget your login information for a site.  Frank Voisin suggests a few ideas to make them more applicable.

However, the second item jarred with me – Applicable: the question should be possible to answer for as large a portion of users as possible (ideally, universal).

Why?

I would have thought that the primary (and only) function was to have something which was individual to the person involved.

Now I’m only a human factors scientist, but my training suggests that we ask the individual to design their own questions.  Sure, give them some advice and make the process as intuitive as possible, but give them the ability to make it as individual as they like – surely that‘s the whole point!  After all, this information is only kept in a secure database to be accessed as needs permit.

Is it more that the systems designer was trying to make his or her job easier?  Sort of fitting the human to the system rather than designing it to the individual’s explicit needs?  Did this save them a few lines of code?

Obviously some human science input into this area is sorely needed.  This raises the question of whether someone who is a computer scientist first and has cross-trained into the human interface is the best person for this role, or someone with a psychology or social science background.
My suggestion is that in this case, you really need some cross disciplinary interaction to arrive at an optimal solution.