WO2005018449A1 - Aptitude testing - Google Patents
Aptitude testing Download PDFInfo
- Publication number
- WO2005018449A1 WO2005018449A1 PCT/AU2004/001100 AU2004001100W WO2005018449A1 WO 2005018449 A1 WO2005018449 A1 WO 2005018449A1 AU 2004001100 W AU2004001100 W AU 2004001100W WO 2005018449 A1 WO2005018449 A1 WO 2005018449A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ssvep
- subject
- responses
- aptitude
- coherence
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6814—Head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
- A61B5/161—Flicker fusion testing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/369—Electroencephalography [EEG]
- A61B5/377—Electroencephalography [EEG] using evoked responses
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/28—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for medicine
Definitions
- the present invention relates generally to the field of aptitude testing, including apparatus and methods for testing the aptitude of subjects to mental tasks and assessing subjects thinking style.
- Aptitude and thinking style are closely related and thus a test that can identify aptitude can also be used to identify a subject's thinking style. Knowledge of a subject's thinking style can also be used to identify the optimum teaching and training approach for the subject.
- the invention provides a method of assessing the cognitive aptitude of a subject to a predetermined task, the method including the steps of: (i) presenting to the subject a group of cognitive tasks; (ii) detecting brain response signals from the subject during presentation of said group of cognitive tasks ; (iii) calculating amplitude, phase and/or coherence SSVEP responses from said brain response signals; and (iv) comparing said SSVEP responses to known SSVEP responses obtained from individuals with high and/or low aptitudes to said predetermined task in order to assess the subject's aptitude for said predetermined task.
- the invention also provides an apparatus for assessing the cognitive aptitude of a subject to a predetermined task, the apparatus including: (i) means for presenting to the subject a group of cognitive tasks; (ii) means for detecting brain response signals from the subject during presentation of said group of cognitive tasks; (iii) means for calculating amplitude, phase and/or coherence SSVEP responses from said brain response signals; and (iv) means for comparing said SSVEP responses to known SSVEP responses obtained from individuals with high and/or low aptitudes to said predetermined task in order to assess the subject's aptitude for said predetermined task.
- the present invention can utilise Steady State Probe Topology (SSPT), a brain imaging technique based on the brain's response to a continuous sinusoidal visual flicker or the SSVEP to examine changes in the activity in various brain regions while an individual undertakes a number of cognitive tasks.
- SSPT Steady State Probe Topology
- the cognitive aptitude will be indicated by specific changes in SSVEP amplitude, phase and coherence during a given cognitive task.
- the changes in SSVEP amplitude, phase and coherence can also indicate different thinking styles associated with different patterns of brain activity. Subjects that score high, on a test of analytical thinking show greater left hemisphere phase advance that is interpreted as greater activation of this area during the analytical task. By contrast, subjects that score low on the test of analytical thinking do not show this pattern.
- SSVEP can be used to identify aptitude in specific cognitive domains known to be associated with performance and training aptitude. For example, trainee aircraft pilots need aptitude in visualizing their environment in three dimensions. A test for this ability could involve SSVEP measurements while the subject undertakes the
- the techniques of the invention can be used in a number of different fields including: (i) identifying cognitive aptitude in specific domains; (ii) identifying an individual's thinking style and hence the optimum teaching/training approach; (iii) identifying the suitability of an individual for specific training; and (iv) identifying the suitability of an individual for specific employment.
- the changes in SSVEP amplitude, phase and/or coherence can be an increase or decrease. Also, the magnitude of the change may vary from case to case.
- One way of determining whether there has been a significant change in SSVEP amplitude, phase and/or coherence is by reference to statistical analyses where a change is regarded as significant at the p ⁇ 0.05 level where p represents the probability of a Type 1 statistical error (i.e. wrongly rejecting the null hypothesis).
- Statistical significance can be tested using a number of methods including student's t-test, Hotellig's T2 and the multivariate permutation test. For a discussion of these methods used to analyse the SSVEP see Silberstein R.B., Danieli F., Nunez P.L.
- FIGURE 1 is a schematic diagram of a system of the invention
- FIGURE 2 is a schematic plan view showing in more detail the manner in which visual flicker signals are presented to a subject
- FIGURE 3 is a schematic view showing one of the half silvered mirrors and LED array
- FIGURE 4 diagrammatically illustrates SSVEP phase distribution for a subject with high analytical aptitude
- FIGURE 5 diagrammatically illustrates SSVEP phase distribution where the subject has a low analytical aptitude
- FIGURE 6 diagrammatically illustrates SSVEP phase distribution for subjects with high holistic thinking capacity
- FIGURE 7 diagrammatically illustrates SSVEP phase distribution for subjects with low holistic thinking capacity
- FIGURE 8 diagrammatically illustrates SSVEP coherence at frontal sites for subjects having high verbal IQ
- FIGURE 9 diagrammatically illustrates SSVEP coherence in subjects having high conceptual and visualisation skills.
- FIG. 1 schematically illustrates a system 20 for determining the response of a subject 6 to a cognitive task which can be presented to the subject 6 on a video screen 1 and loudspeaker 11.
- the system includes a computer 2 which controls various parts of the hardware and also performs computation on signals derived from the brain activity of the subject 6, as will be described below.
- the computer 2 also holds the cognitive task which can be presented to the subject 6 on the screen 1 and/or through the loudspeaker 11.
- the subject 6 to be tested is fitted with a helmet 7 which includes a plurality of electrodes for obtaining brain electrical activity from various sites on the scalp of the subject 6.
- the helmet includes a visor 8 which includes half silvered mirrors 17 and 18 and LED arrays 19 and 21, as shown in Figure 2.
- the half silvered mirrors are arranged to direct light from the LED arrays 19 and 21 towards the eyes of the subject.
- the LED arrays 19 and 21 are controlled so that the light intensity therefrom varies sinusoidally under the control of control circuitry 5.
- the control circuitry 5 includes a waveform generator for generating the sinusoidal signal.
- the circuitry 5 also includes amplifiers, filters, analogue to digital converters and a USB interface for coupling the various electrode signals into the computer 2.
- the system also includes a microphone 9 for recording voice signals from the subject 6.
- the microphone 9 is coupled to the computer 2 via a microphone interface circuit 10.
- the system also includes a switch 4 which can be manually operated by the subject as a part of the response to the cognitive task.
- the switch 4 is coupled to the computer 2 via a switch interface circuit 3.
- the computer 2 includes software which calculates SSVEP amplitude phase and/or coherence from each of the electrodes in the helmet 7.
- the subject 6 views the video screen 1 through the visor 8 which delivers a continuous background flicker to the peripheral vision.
- the frequency of the background flicker is typically 13Hz but may be selected to be between 3Hz and 50Hz.
- Brain electrical activity will be recorded using specialised electronic hardware that filters and amplifies the signal, digitises it in the circuitry 5 where it is then transferred to the computer 2 for storage and analysis.
- SSPT is used to ascertain regional brain activity at the scalp sites using SSPT analysis software.
- the cognitive tasks are presented on the video screen 1 and/or via the loudspeaker 11.
- the subject 6 is required to make a response that may comprise a button push on the switch 4 and/or a verbal response which is detected by the microphone 9.
- the topographic distribution of the SSVEP amplitude, SSVEP phase and SSVEP coherence during the performance of the cognitive tasks can be correlated with the aptitude and thinking style of the subject.
- the microphone 9 generates audio signals which are amplified, filtered and digitised via the interface 10 and stored as sound files on the computer 2. This enables the timing of the verbal responses to be determined within an accuracy of say 10 microseconds.
- the subject may respond to the cognitive task via a motor response such as a button push via the switch 4.
- the precise timing of all events presented to the subject 6 are preferably determined with an accuracy of no less than 10 microseconds.
- the visor 8 includes LED arrays 19 and 21.
- the light therefrom is varied sinusoidally.
- An alternative approach utilises pulse width modulation where the light emitting sources are driven by l-10Khz pulses where the pulse duration is proportional to the brightness of the sight emitting sources.
- the control circuitry 5 receives a digital input stream from the computer 2 and outputs pulse width modulated pulses at a frequency of l-10Khz. The time of each positive going zero-crossing from the sinusoidal stimulus waveform is determined to an accuracy of 10 microsecond and stored in the memory of the computer 2.
- Brain electrical activity is recorded using multiple electrodes in helmet 7 or another commercially available multi-electrode system such as Electro-cap (ECI Inc., Eaton, Ohio USA).
- the number of electrodes is normally not less than 16 and normally not more than 256, and is typically 64.
- Brain activity at each of the electrodes is conducted to the control circuitry 5.
- the circuitry 5 includes multistage fixed gain amplification, band pass filtering and sample- and-hold circuitry for each channel associated with an electrode of the helmet.
- Amplified/filtered brain activity is digitised to 16 bit accuracy at a rate not less than 300Hz and transferred to the computer 2 for storage on hard disk.
- the timing of each brain electrical sample together with the time of presentation of different components of the cognitive task are also registered and stored to an accuracy of 10 microseconds.
- the digitised brain electrical activity (EEG) together with timing of the stimulus zero crossings enables calculation of the SSVEP from the recorded EEG or from EEG data that has been pre-processed using Independent Components Analysis to remove artefacts and increase the signal to noise ratio.
- EEG digitised brain electrical activity
- n the nth stimulus cycle
- S the number of samples per stimulus cycle (16)
- ⁇ the time interval between samples
- T the period of one cycle
- f(nT+i ⁇ ) the EEG signal (raw or pre-processed using ICA).
- Amplitude and phase components can be calculated using either single cycle Fourier coefficients or coefficients that have been calculated by integrating across multiple cycles. Two types of coherence functions are calculated from the SSVEP sine and cosine
- SSVEP Coherence SSVEP Coherence
- ER- SSVEPC Event Related SSVEP Coherence
- the SSVEP sine and cosine coefficients can be expressed as complex numbers
- Equation 1.4 the phase of the SSVEPC is given by ER-SSVEPC
- the SSVEP responses associated with the various tasks can be calculated and separately averaged.
- the SSVEP amplitude, phase and coherence can be compared with a database of results for groups of subjects with high aptitude and specific thinking styles. The comparison will identify the individuals specific thinking style and aptitude. For example, individuals with an aptitude for computer software development may demonstrate increased SSVEP phase lag at prefrontal sites and reduced left frontal SSVEP coherence while performing Raven's Progressive Matrices (a task used in IQ tests). By contrast, an individual suited as an aircraft pilot may demonstrate reduced left temporal SSVEP coherence when performing the mental rotation task.
- the database can be situated on a remote computer (not shown) accessed via the internet through a modem 12.
- Figure 4 illustrates the SSVEP phase from a subject having high analytical aptitude.
- the lighter areas represent SSVEP phase advance or regions of increased brain processing speed.
- the darker shades represent SSVEP phase lag or regions of reduced brain processing speed.
- the light area 50 delineated in broken lines demonstrates and area of greater activation. This area is situated in the posterior left hemisphere in the region of the temporal and parietel cortex. This indicates that the subject has a high analytical aptitude.
- Figure 5 graphically represents the SSVEP phase distribution for a subject carrying out the same test. It will be noted that there are no light areas in the distribution and this distribution is interpreted as demonstrating that the subject has low analytical aptitude.
- Example 1 The same equipment was used as in Example 1 above but the subjects were made to perform the Gestalt Completion Test.
- the Gestalt Completion Test places demands on holistic thinking. Electrical activity from the electrode sites was analysed using the SSPT technique based on computer algorithms listed in Equation 1.1 and the results displayed graphically.
- Figure 6 diagrammatically shows SSVEP phase distribution. The results include a light area 52 bounded by broken lines. This light area demonstrates increased activity in the right temporal and right frontal areas which is consistent with the importance of right hemisphere activity in holistic recognition. This is interpreted as indicating that the subject has high holistic thinking ability.
- Figure 7 in contrast shows the results of a subject performing the same test for a subject having low holistic thinking abilities.
- the SSVEP phase distribution shows reduced left temporal activity and enhanced left parietal, left posterior activity as indicated by the light area 54 bounded by broken lines.
- EXAMPLE 3 The system shown in Figures 1 to 3 was used to test subjects carrying out a computerised version of Raven's Progressive Matrices. Electrical activity was again processed using the SSPT technique based on computer algorithms listed in Equation 1.8. The results are displayed graphically in Figures 8 and 9.
- the graph of Figure 8 shows event related SSVEP coherence between activity recording sites 56.
- the display includes a plurality of lines 58 between frontal sites. This result was produced from statistically significant differences in event related SSVEP coherence recorded from participants having high verbal IQ scores.
- Figure 9 graphically illustrates statistically significant differences in event related
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112004002948T DE112004002948T5 (en) | 2003-08-21 | 2004-08-18 | fitness test |
GB0702375A GB2432006B (en) | 2003-08-19 | 2004-08-18 | Aptitude testing |
EP04761137A EP1781167A4 (en) | 2003-08-21 | 2004-08-18 | Aptitude testing |
US10/568,650 US7454243B2 (en) | 2003-08-21 | 2004-08-18 | Aptitude testing |
CA002576149A CA2576149A1 (en) | 2003-08-21 | 2004-08-18 | Aptitude testing |
JP2007526104A JP2008509762A (en) | 2004-08-18 | 2004-08-18 | Aptitude test |
AU2004266029A AU2004266029A1 (en) | 2003-08-21 | 2004-08-18 | Aptitude testing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003904477 | 2003-08-21 | ||
AU2003904477A AU2003904477A0 (en) | 2003-08-21 | Aptitude Testing Through Brain Activity Measures |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005018449A1 true WO2005018449A1 (en) | 2005-03-03 |
Family
ID=34200689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2004/001100 WO2005018449A1 (en) | 2003-08-19 | 2004-08-18 | Aptitude testing |
Country Status (6)
Country | Link |
---|---|
US (1) | US7454243B2 (en) |
EP (1) | EP1781167A4 (en) |
AU (1) | AU2004266029A1 (en) |
CA (1) | CA2576149A1 (en) |
DE (1) | DE112004002948T5 (en) |
WO (1) | WO2005018449A1 (en) |
Cited By (7)
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GR20050100553A (en) * | 2005-11-07 | 2007-06-21 | �. ������ | New method for continuous and long-term recording and simultaneous analysis of the electrical activity of the brain by the evoked-potential method and with the capability of simultaneous modificationof the brain activity by neuro-bio-feedback |
US7467097B2 (en) | 2000-04-11 | 2008-12-16 | Sony Corporation | Business management method, business management apparatus and data broadcast delivery method |
US20100010366A1 (en) * | 2006-12-22 | 2010-01-14 | Richard Bernard Silberstein | Method to evaluate psychological responses to visual objects |
US20100030097A1 (en) * | 2006-12-22 | 2010-02-04 | Richard Bernard Silberstein | Method to determine the attributes associated with a brand or product |
US20100094702A1 (en) * | 2006-12-22 | 2010-04-15 | Richard Bernard Silberstein | Method for evaluating the effectiveness of commercial communication |
US20100092934A1 (en) * | 2006-12-22 | 2010-04-15 | Richard Bernard Silberstein | method to determine the psychological impact of entertainment or individual presenters |
CN102722244A (en) * | 2012-05-25 | 2012-10-10 | 西安交通大学 | Steady-state evoked potential brain-computer interface method based on motion turning vision sensing |
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US20050273017A1 (en) * | 2004-03-26 | 2005-12-08 | Evian Gordon | Collective brain measurement system and method |
JP4497081B2 (en) * | 2005-10-31 | 2010-07-07 | トヨタ自動車株式会社 | Human condition detection device |
US20100056276A1 (en) * | 2006-12-22 | 2010-03-04 | Neuroinsight Pty. Ltd. | Assessment of computer games |
US20100076334A1 (en) * | 2008-09-19 | 2010-03-25 | Unither Neurosciences, Inc. | Alzheimer's cognitive enabler |
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US20150170537A1 (en) * | 2013-12-17 | 2015-06-18 | Selwyn Super | System and method for assessing visual and neuro-cognitive processing |
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2004
- 2004-08-18 AU AU2004266029A patent/AU2004266029A1/en not_active Abandoned
- 2004-08-18 CA CA002576149A patent/CA2576149A1/en not_active Abandoned
- 2004-08-18 US US10/568,650 patent/US7454243B2/en not_active Expired - Fee Related
- 2004-08-18 EP EP04761137A patent/EP1781167A4/en not_active Withdrawn
- 2004-08-18 WO PCT/AU2004/001100 patent/WO2005018449A1/en active Application Filing
- 2004-08-18 DE DE112004002948T patent/DE112004002948T5/en not_active Withdrawn
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Cited By (10)
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US7467097B2 (en) | 2000-04-11 | 2008-12-16 | Sony Corporation | Business management method, business management apparatus and data broadcast delivery method |
GR20050100553A (en) * | 2005-11-07 | 2007-06-21 | �. ������ | New method for continuous and long-term recording and simultaneous analysis of the electrical activity of the brain by the evoked-potential method and with the capability of simultaneous modificationof the brain activity by neuro-bio-feedback |
US20100010366A1 (en) * | 2006-12-22 | 2010-01-14 | Richard Bernard Silberstein | Method to evaluate psychological responses to visual objects |
US20100030097A1 (en) * | 2006-12-22 | 2010-02-04 | Richard Bernard Silberstein | Method to determine the attributes associated with a brand or product |
US20100094702A1 (en) * | 2006-12-22 | 2010-04-15 | Richard Bernard Silberstein | Method for evaluating the effectiveness of commercial communication |
US20100092934A1 (en) * | 2006-12-22 | 2010-04-15 | Richard Bernard Silberstein | method to determine the psychological impact of entertainment or individual presenters |
JP2010514277A (en) * | 2006-12-22 | 2010-04-30 | エスエスピーティー プロプライアタリー リミティド | Evaluation method of effectiveness of commercial communication |
AU2006352276B2 (en) * | 2006-12-22 | 2013-09-26 | Neuro-Insight Pty. Ltd. | A method for evaluating the effectiveness of commercial communication |
CN102722244A (en) * | 2012-05-25 | 2012-10-10 | 西安交通大学 | Steady-state evoked potential brain-computer interface method based on motion turning vision sensing |
CN102722244B (en) * | 2012-05-25 | 2014-10-15 | 西安交通大学 | Steady-state evoked potential brain-computer interface method based on motion turning vision sensing |
Also Published As
Publication number | Publication date |
---|---|
CA2576149A1 (en) | 2005-03-03 |
US7454243B2 (en) | 2008-11-18 |
DE112004002948T5 (en) | 2007-08-02 |
EP1781167A1 (en) | 2007-05-09 |
US20060184058A1 (en) | 2006-08-17 |
AU2004266029A1 (en) | 2005-03-03 |
EP1781167A4 (en) | 2008-10-29 |
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