1. No category

Clickers - "the greatest new teaching tool since chalk:"
How to use and not misuse audience response systems
December 1, 2007
1. Evidence for the benefits of active learning in general.
2. How clickers can be used effectively.
3. Side benefits of clicker use.
4. The down side: some common problems with using clickers.
5. Writing good clicker questions.
6. Write your own clicker questions.
• explain and defend the pedagogical advantages of
using clickers in large classes.
• design effective clicker questions that assess
conceptual understanding, not just note-taking skills
or memorization.
Outline
-- Break --
After this workshop, participants should be able to:
• design classes that address necessary content
while allowing time for clicker discussions and other
student-centered activities.
Bill Wood
Department of MCD Biology
University of Colorado, Boulder
ASCB 2007, Education Workshop
Learning goals:
Clickers
How to use:
Press On/Off button.
The blue POWER light should come on.
To vote, press A, B, etc.
The VOTE STATUS light will flash green if
your vote was recorded successfully, flash red if not
(let me know and we'll give you another clicker).
To change your vote, just press another key.
That's it! These are RF clickers; receiver unit plugs into my
computer USB port.
1
Demographics
I am a
A) K-12 teacher
B) College faculty at a
P.U.I.
C) College faculty at a
research university
Clickers
Have you used clickers before, as an instructor or
a student?
A) Yes
B) No
D) Non-tenure track
college faculty
E) Student or postdoc
Origins and development of clickers
1. Why Clickers?
(and other student-centered active-learning
activities in class as opposed to traditional lecture)?
Some evidence that they work
2
The idea of active learning is not new
主动学习／Active Learning
我听， 我忘记。
我看， 我记住。
我做， 我理解。
－ 孔子
I hear, and I forget.
I see, and I remember.
I do, and I understand.
- Confucius, ~ 450 BCE
How can learning gains be measured?
Measure conceptual understanding using the
same set of assessment questions*:
As a pre-test, before the start of a
course,
and again as a post-test, perhaps
imbedded in the final exam. Then calculate a
normalized learning gain for each student:
Normalized % Learning Gain =
(post-test minus pre-test) x 100
(100 minus pre-test)
*A carefully designed, validated test, not just the final exam!
Now you're in a position to do . . .
Average normalized gains for students of a single
instructor, teaching the same physics course over
several semesters in two different styles
Scientific Teaching!
Passive
Active
Make course changes, introduce innovative
approaches, and measure the effects on learning.
Robert Beichner and Jeffrey Saul (2004), SCALE-UP Program, Dept. of Physics,
N.C.S.U., recent NSF CCLI Conference Proceedings
3
Comparison of student normalized learning gains in
traditional and interactive-engagement courses
Number of students
Interactive-engagement vs traditional methods: A sixthousand student survey of mechanics test data for
introductory physics courses
traditional
interactive
interactive
Average normalized learning gain
Traditional:
n=14 courses
Interactive:
n=74 courses
Richard R. Hake, Department of Physics, Indiana University, Bloomington, Indiana
Am. J. Phys. 66: 64 (1998)
% normalized learning gain
Developmental biology,a required course for majors, ~70 junior and senior undergraduates,
taught in Fall '03, Spr. 04,and Spr. 05 by Jennifer Knight and Bill Wood (Cell Biol Educ 4: 298310, 2005).
A. Traditional (F'03)
Distribution of
learning gains
by course
grade achieved
2. Effective use of clickers:
Identifying misconceptions
Number
of
students
Assessing conceptual understanding
Normalized learning gain range (%)
B. Interactive (S'04)
Number
of
students
Normalized learning gain range (%)
4
Clicker question:
Electron micrograph of a gene caught in the act of transcription
The molecules making up the mass of the wood that
forms during growth of a tree are derived
primarily from
DNA
A) sunlight.
B) the air.
C) the seed.
D) the soil.
mRNAs
Left
Right
Which way is transcription going?
A) left to right.
B) right to left.
(Adapted from Diane Ebert-May)
3
1
2
Three identical plates of radish seeds are incubated
under three different conditions, with results as
shown. How will the dry weights of the three plates
compare at the end of the experiment?
A) 1 < 2 < 3
B) 1 < 3 < 2
C) 1 = 3 < 2
D) 3 < 1 < 2
E) 1 = 2 = 3
(Adapted from Diane Ebert-May)
1 1.46 g
2 1.63 g
3 1.20 g
Three identical plates of radish seeds are incubated
under three different conditions, with results as
shown. How will the dry weights of the three plates
compare at the end of the experiment?
A) 1 < 2 < 3
B) 1 < 3 < 2
C) 1 = 3 < 2
D) 3 < 1 < 2
E) 1 = 2 = 3
5
Example
2. Effective use of clickers:
Identifying misconceptions
Assessing conceptual understanding
The facts and the concept of maternal
effects in C. elegans
Using "peer instruction"
Lecture presentation: a mixture of facts and concepts:
oogenesis
maternal mRNAs and proteins
genetic consequences if they're essential in
embryonic development
The gonad and early cleavages in the embryo
Clicker question:
If a strict maternal-effect embryonic-lethal mutation
is segregating in a mating population of C. elegans, the viability
of an embryo will depend on
A) its genotype.
B) the genotype of
its maternal parent.
C) the genotype of
its paternal parent.
D) the genotypes of
both parents.
G 8.43
> 90% usually get the right answer
6
Maternal-effect lethal mutants
P0
+/+
F1
m/+
Maternal-effect lethal mutants
mutagenize
Question: If m is a strict
maternal-effect recessive
mutation:
P0
+/+
A) m/m embryo will live.
F1
m/+
F2
+/+
live
mutagenize
A) m/m embryo will live.
B) m/m embryo will die.
F2
F2 embryo will
+/+
live
m/+
live
m/m
?
Question: If m is a strict
maternal-effect recessive
mutation:
B) m/m embryo will die.
F2 embryo will
m/+
live
m/m
?
initial individual answers
n=70
Maternal-effect lethal mutants
What to do when you find out that half
the class doesn’t understand?
P0
+/+
F1
m/+
F2
+/+
live
mutagenize
Question: If m is a strict
maternal-effect recessive
mutation:
A) m/m embryo will live.
B) m/m embryo will die.
Embryo will
m/+
live
m/m
?
initial individual answers
after group discussion
n=70
7
What to do when you find out that half
the class doesn’t understand?
Don't forget to discuss what happened !
Peer instruction works!
E. Mazur, Peer Instruction, A Users
Manual, Prentice-Hall, 1996)
2. Effective use of clickers:
Identifying misconceptions
Assessing conceptual understanding
Using "peer instruction"
Teaching sequential information
Making a KO mouse. First, engineer ES cells: go
through the molecular biology
In fact, you need two selectable markers
• To select for a construct that has actually
inserted into a specific location, have to use
some tricks
• Positive selection: neomycin resistance:
construct contains neo resistance gene; any cell
that has incorporated the construct (even
randomly) will be resistant to neomycin
• Negative selection: thymidine kinase (TK) from
the herpes virus. If a cell contains the TK
gene, it will be killed by the drug gancylovir
YFG
Neor
YFG
TK
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Then go through the breeding steps
Remember, the ES cells are from a black mouse
The black coat color allele is dominant
Then step through the entire sequence of steps with
clicker questions to test comprehension
You transfect ES cells from a black mouse (dominant marker) with
this construct :
Neor
TK
YFG
YFG
Following transfection, the culture will include
a) cells that have lost the transgene without inserting it
b) cells that have inserted the transgene by homologous
recombination at the YFG locus
c) cells that have inserted the transgene at another locus by
end-joining to a nicked strand followed by DNA repair.
1) In non-selective growth medium (no neomycin or gancyclovir)
the most frequent class of cells will be ___.
2) In medium containing gancyclovir alone, the most frequent
class of cells will be ___.
G 4.21
YFG
Neor
YFG
TK
a) cells that have lost the transgene without inserting it
b) cells that have inserted the transgene by homologous
recombination at the YFG locus
c) cells that have inserted the transgene at another locus by
end-joining to a nicked strand followed by DNA repair.
5. You inject embryonic stem cells that have undergone homologous
recombination at the YFG locus into blastocysts obtained from
a mated white mouse and reimplant them into pseudopregnant
white females.
When she gives birth to offspring (Po mice):
3) In medium containing neomycin alone, the most frequent
class of cells will be ___ .
a) all will be variegated (both black and white patches of coat color).
b) a few may be white, but the majority will be variegated.
c) some will be white, some will be variegated.
4) In medium containing neomycin and gancyclovir, the most
frequent class will be ___.
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6. You mate a variegated (chimeric) female mouse to a white male,
and examine their offspring (F1) for coat color and the presence
of the knocked out YFG. Which of the following statements is
true?
(Remember: the white mice are homozygous black –/black –; black coat color
is dominant, and the gene is on a different chromosome from YFG).
a) All of the black offspring are homozygous for the transgene
(YFG-/YFG-)
b) Some of the black offspring are homozygous for the transgene
(YFG-/YFG-)
3. Some side benefits of clicker use
Impromptu quizzes
Attendance records - setting and keeping
Obtaining demographic information
Monitoring performance of individual students
Getting honest answers to touchy questions
c) All of the black offspring are heterozygous for the transgene
(YFG-/YFG+)
d) All of the black offspring are homozygous normal
(YFG+/YFG+)
e) Some of the black offspring are heterozygous for the transgene
(YFG-/YFG+)
How are you finding this workshop so far?
A) Fascinating and useful
B) Somewhat interesting.
C) Boring.
D) A waste of time.
Benefits of clickers
For you, the student:
• Responses are anonymous
• Instant comparison to your peers
• You’re active and engaged !
For me, the instructor:
• I know you’re there (later)
• I can find out how you answered (later)
• Students come to class
• I know instantly what fraction of you
didn’t understand !
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4. The down side: problems with clickers
For those who have used clickers in teaching, how
successful did you and your students find them in
facilitating learning?
A) Highly successful.
B) Somewhat successful.
C) Not much of an
effect.
D) They had a negative
impact on the course.
E) They were a waste of
time and effort.
Some students may have had bad experiences with
clickers prior to your course
Clickers?
(asked at the start of a recent course)
4. The down side: problems with clickers
Economics
a) I love using clickers.
Technical problems
b) I like using clickers.
Points for credit or participation, or both?
c) I’m neutral about clickers.
Testing memorization or note-taking is boring!
d) I don’t like using clickers.
Clicker discussions take time;
e) I hate using clickers.
how can I still "cover" everything?
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Less is more . . .
Students don't have to learn many of the facts we ask them to
know; they can find them easily later when they need them.
It's not all-or-nothing: even incremental change from lecturing
toward active learning can result in significantly increased
learning gains.
Students can learn a lot more in your course than just what you
tell them. We must put more of the responsibility for content
learning on the students.
http://webphysics.iupui.edu/jitt/jitt.html
(Just Google JiTT)
Just-in-Time Teaching puts more of the
responsibility for content learning on the students.
Instructor assigns pre-class work to be submitted online.
Instructor can assess it in advance, determine the level of
understanding, and plan use of class time accordingly.
Students may object, but . . .
They need to learn how to learn, to reason, to assimilate
information for themselves, to critically evaluate the
information they encounter, and to understand how science is
done,
much more than they need to know a lot of factual knowledge.
More active learning is a step in the right direction.
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Why clickers can fail to please
5. Writing good clicker questions
(It's not trivial)
Factual recall questions are neither fun
nor particularly helpful.
Good clicker questions:
are "EnGauging"
are conceptual
See Beatty et al. article in your folder
Bloom's Taxonomy of the Cognitive Domain
(levels of understanding)
6. Evaluation: think critically about and defend a position
5. Synthesis: transform, combine ideas to create something new
4. Analysis: break down concepts into parts
3. Application: apply comprehension to unfamiliar situations
2. Comprehension: demonstrate understanding of ideas, concepts
Bloom's Taxonomy of the Cognitive Domain
6. Evaluation: think critically about and defend a position
Judge, Justify, Defend, Criticize, Evaluate
5. Synthesis: transform, combine ideas to create something new
Develop, Create, Propose, Design, Invent
4. Analysis: break down concepts into parts
Compare, Contrast, Distinguish
3. Application: apply comprehension to unfamiliar situations
Apply, Use, Compute, Solve, Predict
2. Comprehension: demonstrate understanding of ideas, concepts
Restate, Explain, Summarize, Interpret, Describe
1. Factual Knowledge: remember and recall factual information
Define, List, State, Name, Cite
1. Factual Knowledge: remember and recall factual information
Adapted from Allen, D. and Tanner, K., Cell Biol. Educ. 1: 63-67 (2002)
13
Bloom's Taxonomy of the Cognitive Domain
Example: Questions from a virology course
2. Comprehension: demonstrate understanding of ideas, concepts
Restate, Explain, Summarize, Interpret, Describe,
Explain how the life cycle of a lytic animal virus proceeds.
1. Factual Knowledge: remember and recall factual information
Define, List, State, Name, Cite
Name the coat components of a typical lytic animal virus.
From Allen, D. and Tanner, K., Cell Biol. Educ. 1: 63-67 (2002)
Bloom's Taxonomy of the Cognitive Domain
6. Evaluation: think critically about and defend a position
Judge, Justify, Defend, Criticize, Evaluate
Would you argue that viruses are alive? Why or why not?
5. Synthesis: transform ideas into something new
Develop, Create, Propose, Design, Invent
Propose a way in which viruses could be used to treat a human
disease.
4. Analysis: break down concepts into parts
Compare, Contrast, Distinguish
What distinguishes the replication processes of RNA and DNA
viruses?
3. Application: apply comprehension to unfamiliar situations
Apply, Use, Compute, Solve, Predict
Based on your knowledge of viral life cycles, what effects
would you predict anti-viral drugs might have on viruses?
From Allen, D. and Tanner, K., Cell Biol. Educ. 1: 63-67 (2002)
Bloom's Taxonomy of the Cognitive Domain
6. Evaluation: think critically about and defend a position
5. Synthesis: transform, combine ideas to create something new
4. Analysis: break down concepts into parts
3. Application: apply comprehension to unfamiliar situations
2. Comprehension: demonstrate understanding of ideas, concepts
Most questions on biology exams!
1. Factual Knowledge: remember and recall factual information
The 5-minute university
Guido Sarducci, from Saturday Nite Live, ~1982
14
Why clickers can fail to please
Factual recall questions are neither fun
nor particularly helpful.
Good clicker questions:
are "EnGauging"
are conceptual
include plausible distractors based on
common misconceptions
can't be easily "gamed"
See Beatty et al. article in your folder
Is this question testing conceptual knowledge?
Multiple choice questions must be validated!
A heritable disease that primarily affects women and not men is
most likely caused by:
a) a mutation in a gene on the X chromosome.
b) a mutation in a gene on a non-sex chromosome
(autosome).
c) Without additional information, either answer (a) or (b)
is possible.
Answer: c
Is this question testing conceptual knowledge?
Multiple choice questions must be validated!
A heritable disease that primarily affects women and not men is
most likely caused by:
a) a mutation in a gene on the X chromosome.
b) a mutation in a gene on a non-sex chromosome
(autosome).
c) Without additional information, either answer (a) or (b)
is possible.
Answer: c
B- : "When I see 'most likely' it has to be one of the answers that is
listed." [I.e. either a) or b)]
C- : "My test taking experience tells me not to answer c), I should
just pick one or the other, so I will go with a)."
6. Workshop exercise:
Try writing your own clicker questions
A : I would have only answered c) at the beginning of the class
because I didn’t know the right answer…
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Writing your own clicker questions
•
Form groups of 3-5,
•
Agree on one or two concepts you know students have difficulty with.
•
Write one or two multiple choice clicker questions to assess student
if possible with colleagues who teach the same area of biology.
understanding of this concept, with distractors based on your
knowledge of common misconceptions, following Beatty's
suggestions.
•
Try to write questions that assess "higher" Bloom's levels of
conceptual understanding, not just factual recall.
•
Pass questions in to me (or email them?: [email protected]). I'll
choose a few and put them up on the screen so we can try them
out and then discuss them.
Following are questions from workshop participants
Which of the following is least likely to result in change in phenotype?
a. Insertion 10 nucleotides in the TATA box
b. Insertion of a G nucleotide in Exon 2.
c. D e letion of 37 nucleotides in the center of Intron 1
d. Insertion of AUG in the 5’UTR
Diagram of typical gene from Gilbert's
development text, would not transfer
from PC to Mac.
soma
Motor neuron
electrode
If a neuron is stimulated by
depolarization half-way along
the length of the axon,
which way will an action
potential travel?
terminal
Muscle
A) Right toward terminal
B) Left toward soma
C) Both directions
D) You can't generate an action
potential in this situation
E) None of the above.
Two individuals in a 4-person pedigree show
a particular trait. Which pair of
affected individuals (if any) would rule
out an X-linked dominant mode of
inheritance?
A) Mom and daughter
B) Mom and son
C) Dad and daughter
D) Dad and son
E) None of the above
16
Taxol stabilizes microtubules, preventing their
depolymerization. If taxol were added to a
synchronized population of cells that had just
competed S phase, what would happen?
A) Cells will not be able to
assemble a metaphase
spindle.
B) Cells will be able to
assemble a spindle, but
won't be able to separate
their chromosomes.
Increasing the substrate concentration for an
enzyme-catalyzed reaction has effects on
A) Vmax sometimes
B) Vo sometimes
C) Km sometimes
D) Keq sometimes
C) Cells will be able to
separate their
chromosomes but won't be
able to execute
cytokinesis.
Which of these diets causes weight loss by forcing the
metabolism of Krebs cycle intermediates?
A) Raw food diet.
A single chromosome from one of your somatic cells is likely
to be
B) Vegan diet (no meat)
A) Identical to a chromosome from a somatic cell in your
mother or father.
C) Atkins diet (no carbohydrates)
B) Derived from both your parents.
D) Caloric restriction (nutritious diet but low calories).
C) Derived from both your maternal or paternal
grandparents.
D) Derived from both your maternal and paternal
grandmothers or grandmothers.
17
You are interested in amplifying a section of DNA from a
template containing the following sequence:
5'A A T T C G G T T G A T T C A A A T T T A T G G G C C
T A C G A T 3’
Which of the following primer pairs would amplify a product
from this template? (note that the convention is that, given no
other indication, nucleotide sequences are written 5’ to 3’)
A)
B)
C)
D)
E)
TTAA
AATT
AATT
AATT
TTAA
and
and
and
and
and
TAGC
CGAT
TAGC
ATCG
ATCG
If you change a valine to a phenyalanine in the interior of a
protein, what would be the most likely effect on the
protein’s structure?
A) It will stabilize the protein because of the additional
bonds formed by phenylalanine.
B) It will disrupt the structure because of steric effects.
C) It will have no effect because they are both nonpolar.
D) It will disrupt the protein because valine is polar and
phenylalanine is nonpolar.
E) It will disrupt the protein because phenylalanine is polar
and valine is nonpolar.
If you mate a homozygous wild type fruit fly with a fly that
is homozygous for recessive mutations that cause brown eyes
and shriveled wings, then cross their F1 offspring, you would
expect a ratio of 9 wild type: 3 red eyes and shriveled wings:
3 brown eyes and normal wings: 1 brown eyes and shriveled
wings. The most likely explanation for this result is:
A) Both mutants cause heterozygous lethality.
B) One gene is X-chromosome linked
C) The two genes are linked.
D) There was recombination between the two genes.
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