CH8 Flashcards
Vigilance decrement:
the decrease in the attention of infrequent target stimuli over the first half-hour of performance.
Automation:
educes the attentional and cognitive demands
placed on the operator, adapt to behaviors of specific users.
Mode error:
mistakenly enter information thinking that one mode is in effect when another really is. Operators may be ‘out of the loop’.
One concern for the study of attention is
automation. A benefit is that it reduces the
attentional and cognitive demands placed on the operator by allowing problems to be
detected without requiring operator intervention. Another benefit is that systems can be
programmed to adapt to the behaviours of specific users. Drawback: mode error, in which
the interface has several modes for information entry and the operator mistakenly enters the
information thinking that one mode is in effect when really another is. An over-reliance on
automation may lead operators to fail to detect problems.
Pursuit eye movements are
important in tasks that require following a
moving “track”.
Grouping principles can be done with
the Gestalt principles:
- Proximity: components in close spatial proximity tend to be grouped together
- Similarity: components that are similar in appearance tend to be grouped together
- Continuity: components that follow a continuous contour tend to be grouped together
- Closure: gaps between contours tend to be filled in
- Common fate: components that move in the same direction or at the same speed will
tend to be grouped together
Displays should be organised in a consistent manner in order to minimise the amount of
attention that needs to be allocated to searching for the information. Also, they should be
organised to minimise clutter.
the Gestalt principles:
- Proximity: components in close spatial proximity tend to be grouped together
- Similarity: components that are similar in appearance tend to be grouped together
- Continuity: components that follow a continuous contour tend to be grouped together
- Closure: gaps between contours tend to be filled in
- Common fate: components that move in the same direction or at the same speed will
tend to be grouped together
- Proximity:
components in close spatial proximity tend to be grouped together
- Similarity:
components that are similar in appearance tend to be grouped together
- Continuity
components that follow a continuous contour tend to be grouped together
- Closure:
gaps between contours tend to be filled in
- Common fate:
components that move in the same direction or at the same speed will
tend to be grouped together
Object displays are
multidimensional displays that can be perceived and monitored as a single object.
Identity matching
know exactly what option to
search for.
Equivalence search
know what option, but not how it is labeled.
Inclusion matching
can be used to find an option that is classified within a menu when the user does not know under which class a specific option would be categorised.
Smart menus
only
display the commands that have been used frequently or recently.
breadth versus
depth trade-off.
You can either
have a broad design: few menus with many commands, or a deep design: many
menus with fewer commands under each one.
Deep is preferred
multifunctional
displays consist of
multiple display options mapped to a limited number of keys. Two
steps are involved in creating an optimal mapping of hierarchy labels to buttons: (1)
development of a quantitative model of the time needed to search through the
hierarchy, and (2) application of an optimization algorithm to determine the best
mapping according to the model.
Gaze-contingent multiresolutional displays:
high-
resolution part with low-resolution remainder, that dynamically changes as the observer moves their eyes so that the area that the eyes see always is high-res
multiple display options mapped to a limited number of keys. Optimal
mapping: quantitative model of time needed to search, optimization algorithm.
limited region of high resolution, area always corresponds to part of the
image falling on or around the fovea.
There are two types of proximity:
perceptual proximity
Processing proximity
perceptual proximity
refers of the perceptual
similarity that exists between different components of the display. This includes spatial,
chromatic (colour), form, measurement, and code (analog or digital). Spatial proximity refers
to the distance between the items of the displays.
Spatial proximity
refers
to the distance between the items of the displays.
Processing proximity
is how much
attention must be focused on the different components of a display in order to obtain the
information necessary to complete a task.
This can be characterised by three different
categories: integrative processing (active integration of the components through
computational integration), non-integrative processing (similarity among the components of
the display), and independent processing (doesn’t require processing of components
together bc separate decisions are made for each display component).