referring initially to fig1 the audiovisual teaching apparatus 11 of the present invention is shown to include a common television monitor 13 , a video tape transport 15 mounted thereon , and a switch console 17 having plural labeled switches . the first of these switches , labeled &# 34 ; start &# 34 ;, is utilized by the student for initiating the motion video sequence . the second switch on the console 15 is labeled &# 34 ; replay &# 34 ; and permits the student to repeat a motion video sequence after its completion . the next four switches , labeled &# 34 ; 1 &# 34 ; through &# 34 ; 4 &# 34 ;, are utilized by the student for selecting a course of action in response to the scene depicted on the video monitor 13 . located on the top of the monitor 13 , the video tape transport 15 is shown schematically in fig2 to include a supply reel 18 and a take - up reel 19 for transporting magnetic tape 21 past a playback head 23 . each of the supply and take - up reels 18 , 19 is rotated on the armature shaft of a motor 24 and 26 , respectively , the motor 24 being energized to rewind the tape 21 and being unenergized during the normal playback mode of the transport 15 . the motor 26 is a low torque motor which serves only to generate tension in the tape 21 for collecting the tape 21 on the reel 19 and for providing adequate contact with a capstan 25 . the capstan 25 is driven by a synchronous motor 27 at a closely regulated speed . the contact of the capstan 25 with the tape 21 may be assured by a pressure roller 29 bearing against the tape 21 opposite the capstan 25 . a pair of guides 31 mount the playback head 23 for vertical movement , as viewed in fig2 to select various recorded tracks on the tape 21 . a motor 33 drives a lead screw 35 threaded to the mounting for the playback head 23 to adjust the position of the playback head 23 along the guides 31 . in addition , a pair of switches 37 and 39 are positioned along the path of the tape 21 , the switch 37 being responsive to metal foil tape positioned at the top of the tape 21 and the switch 39 being responsive to metal foil tape at the lower edge of the tape 21 , as viewed in fig2 . as is common in the audio 8 - track tape systems currently on the market , the switches 37 and 39 are responsive to the presence of foil on the tape 21 for closure , each of the switches 37 , 39 responding only to metal foil passed adjacent the switch structure . referring now to fig3 the arrangement of recorded information on the tape 21 will be described . in this exemplary embodiment , the tape 21 has four tracks of recorded motion video information , numbered 41 through 47 . at various locations along the tape 21 , only the main track , track 41 , includes recorded information . for example , during the segment t 1 shown in fig3 tracks 43 through 47 are blank . during this period t 1 , the sequence of motion video events leading up to a requirement for a decision to be made by the student is recorded on track 41 . also in this period t 1 , after this series of events , the various alternative choices open to the student are presented , along with a designation from 1 through 4 for each of the choices , to enable the student to make a choice on the switches of the console 15 . the segment t 1 is terminated with a metal foil strip 49 on the lower half of the tape 21 , as viewed in fig3 . this foil strip 49 , as will be understood from the detailed description of the circuitry below , automatically stops the tape transport at this point until a decision is made as to which of the various branch tracks is to be played during the next time period . this next time period t 2 contains recorded information on each of the tracks 41 through 47 , each recorded track presenting the likely outcome of different choices in response to the questions presented at the end of time t 1 . the recorded information in time block t 2 terminates with a foil strip 51 at the upper half of the tape 21 , signaling the end of this branch sequence . in time t 3 , which occurs after the foil strip 51 , only the track 41 is recorded . this time period t 3 presents a new series of events leading to a new decision to be made by the student . from the previous description , it would be appreciated that switch 37 of fig2 responds only to the foil strip 51 while switch 39 responds only to the foil strip 49 . referring now to fig4 the details of the logic circuitry contained , typically beneath the switch console 15 , and responsive to the switches thereon for operating the transport 15 of fig1 will be described . the switches include a start switch 53 , a replay switch 55 and four decision selection or track selection switches 57 through 63 , numbered 1 through 4 , respectively . with tape loaded into the transport 15 , the first segment is a track such as that labeled t 1 in fig3 and including information recorded on track 41 alone . the educational sequence is started by the student depressing the start switch 53 . this switch may be , for example , a momentary push button switch which is connected between a positive voltage and the set input of a monostable multivibrator or flip - flop 65 . depression of switch 53 sets the flip - flop 65 to produce an output , through an or gate 67 , to energize a capstan motor control circuit 69 which may , in this case , be a simple gate or relay energized by the output of the or gate 67 , to supply power to the capstan drive motor 27 as well as video playback electronics 70 . depression of the switch 53 thus begins motion of the capstan 25 of fig2 to advance the tape 21 past the playback head 23 . at the same time , depression of the switch 53 places a momentary positive pulse on a line 71 connected to an or gate 73 , the output of which is in turn connected to the set input of a flip - flop 75 . this flip - flop 75 is connected to a head selection motor control circuit 77 to drive the head motor 33 to track 41 on the tape 21 ( fig3 ). the signal on this same line 71 is connected to three or gates 79 , 81 and 83 , the output of these or gates being connected to the reset input of three flip - flops 85 , 87 and 89 , respectively . when these flip - flops 85 through 89 are reset , their outputs , each of which is connected to the head selector logic 77 , are grounded , or at binary 0 , so that only the output of flip - flop 75 is energized , or at binary 1 , controlling the head selector electronics 77 to move the head motor 33 to drive the playback head 23 to a position adjacent track 41 . thus , after the start button 53 has been pushed , the head motor 33 automatically drives the playback head 23 to respond to track 41 on the tape 21 , and the recorded sequence is played on the video monitor 13 of fig1 . during this time t 1 , a lifelike sequence of events is portrayed to the student . after this sequence has run its course , the series of four options are presented to the student , each option typically being presented also in motion video form . thus , in the example previously cited relating to an emergency room situation for training doctors , the administration of four different medications is possible . in that example , the choices may be presented by the doctor in the emergency room asking the attending nurse for medications by name , and a narrator &# 39 ; s voice , for example , may be used to identify the four choices by number . at the end of this sequence , metal foil 49 ( fig3 ) will reach the switch 39 of fig2 . this switch , as shown in fig4 resets the flip - flop 65 , deenergizing the motor control circuit 69 to the capstan drive motor 27 and the video screen goes blank . if , at this point , the student were to again push the start button 53 , the foil 49 remains adjacent the switch 39 , so that the flip - flop 65 cannot be set , there being a positive voltage on the reset input of this flip - flop 65 . the student must therefore push one of the switches numbered 1 through 4 , switches 57 through 63 of fig4 . if , for example , the student pushes switch 63 , a positive voltage will be supplied to the set input of flip - flop 89 . this voltage on the flip - flop 89 will set the flip - flop 89 and place a positive voltage at the input to the head selection electronics 77 connected to the flip - flop 89 , adjusting the position of the head motor 33 so that the playback head 23 moves to a location adjacent recorded track 47 of tape 21 ( fig3 ). at the same time , this positive voltage from the switch 63 , through an or gate 91 , sets a flip - flop 93 , producing a positive input at the or gate 67 to energize the capstan drive motor 27 as well as the video playback electronics 70 to play the fourth track , track 47 , one possible alternative course of events determined to be the likely consequence of the student &# 39 ; s choice . the student will therefore view , in motion video form , the likely consequences of his selection . depression of the switch 63 , in addition to setting the flip - flop 89 , resets through one of or gates 79 , 81 or 95 , each of the flip - flops 75 , 85 and 87 , so that the only input to the head selector electronics 77 is from the flip - flop 89 . it can be seen from the interconnections of fig4 that depression of any one of the switches 57 through 63 by the student will set one of the flip - flops 75 , 85 , 87 or 89 in accordance with the switch depressed , and will reset each of the remaining flip - flops 75 , 85 , 87 , 89 so that only one input is at a positive level into the head selector 77 . furthermore , depression of any of the switches will set the flip - flop 93 through the or gate 91 to energize the capstan drive motor 27 and video playback electronics 70 . at the end of the selected video sequence , the metal foil 51 shown in fig3 will be adjacent the switch 37 of fig2 . this switch , as shown in fig4 resets the flip - flop 93 , stopping the capstan drive motor 27 and deenergizing the video playback electronics 70 . a depression of switches 1 through 4 at this point will be ineffective to begin the video transport , since the flip - flop 93 remains reset by closure of the switch 39 . at this point , the student has a choice of depressing the start switch 53 to begin the next educational sequence , that included in time t 3 of fig3 or to depress the repeat switch 55 . depression of this switch 55 will set a flip - flop 95 to energize the rewind motor 24 through motor drive electronics 97 . these electronics 97 may be , for example , a simple switch energized by a positive output of the flip - flop 95 . the switch 55 is advantageously coupled mechanically with a normally closed contact pair 55a to interrupt the signal to the reset input of flip - flop 95 from switch 37 or 39 to permit setting of the flip - flop 95 . the rewind motor 24 will reverse the direction of the tape transport , as shown in fig2 until either one of the foil strips 49 or 51 closes one of the switches 37 , 39 , each of these switches being connected to the input of an or gate 99 which resets the flip - flop 95 , deenergizing the rewind motor 24 . the student has thus reversed the tape to the decision point and can select another one of the switches 1 through 4 to view a second likely consequence of a decision made in response to the video sequence . alternatively , the student may again depress the &# 34 ; relay &# 34 ; button 55 to again view the entire video sequence leading up to the original decisional point . from the description above , it can be seen that the system described herein permits an interaction of the student with the video equipment , the student viewing a motion video scene and making decisions as to how this scene is to proceed . the instructors who produce the film include various choices and the likely consequences of these choices portrayed in motion video form . the student has the choice of viewing the results of various choices or proceeding through the entire sequence on the tape . as mentioned previously , it will be understood that the electronics of fig4 will operate equally well if the transport of fig2 carries photographic film rather than magnetic tape . in this instance , the tracks 41 through 47 of fig3 will be motion picture film tracks positioned side - by - side on photographic film . the playback head 23 of fig2 may then take the form of projection optics which are moved from film track to film track to project the selected branch of video information .